Auckland Electric Power Board Substation (Former)

62-66 The Drive, Epsom, Auckland

  • Auckland Electric Power Board Substation (Former).
    Copyright: NZ Historic Places Trust. Taken By: Joan McKenzie. Date: 21/02/2010.
  • Polychromatic brickwork, metal-frame windows, Art Deco-influenced detailing, looking east.
    Copyright: NZ Historic Places Trust. Taken By: Joan McKenzie. Date: 21/02/2010.

List Entry Information

List Entry Status Listed List Entry Type Historic Place Category 2 Public Access Private/No Public Access
List Number 4509 Date Entered 15th October 2010

Locationopen/close

Extent of List Entry

Extent includes the land described as Lot 1 DP 316321 (CT 63733), North Auckland Land District, and the buildings and structures known as the Auckland Electric Power Board Substation (Former) thereon, and their fittings and fixtures. (Refer to map in Appendix 1 of the registration report for further information).

City/District Council

Auckland Council (Auckland City Council)

Region

Auckland Council

Legal description

Lot 1 DP 316321 (CT 63733), North Auckland Land District

Summaryopen/close

The former Auckland Electric Power Board (AEPB) Substation is a brick building of Stripped Classical design which reflects the development of local electricity distribution networks as an essential element of New Zealand’s infrastructure in the early twentieth century. Erected in Epsom in 1930, it is particularly associated with the provision of electricity in suburban districts and the increasing use of electricity for residential purposes.

The site lies to the northwest of One Tree Hill (Maungakiekie), a substantial pa occupied by Waihoua chief Kiwi Tamaki. The area was later taken over by Ngati Whatua, preceding the founding of Auckland as colonial capital in 1840. The future substation site straddled the boundary of two small colonial farmlets, which were later part of a 1914 residential subdivision. The property was purchased by the AEPB in 1929 for the construction of a substation to convert electrical current from the state grid network to a suitable voltage for local supply. The AEPB had been established in 1922 to service New Zealand’s largest commercial centre and urban population, and erected three substations - including the one in Epsom - in 1930 to supply a rapidly expanding suburban market, linked with the growing use of electricity in the home.

The new Epsom substation was of Stripped Classical design, a modern interpretation of a style traditionally favoured for civic architecture. Metal-frame windows and stylised Art Deco-influenced detailing - possibly depicting the process of hydro-electric power generation - lent an appropriate modernity to a building associated with electricity supply. The identity of the architect is not known. The design provided a spacious interior, substantial doors for the speedy and safe positioning of plant, and incorporated a system of natural ventilation and temperature control. The building was constructed by the Auckland contractor Albert Grinter in the same year that the AEPB celebrated the opening of its new Queen Street headquarters.

Efforts to meet increasing electricity demand resulted in a two-bay addition in 1948 to house more efficient equipment. A new transformer structure was built on an enlarged site in 1972. Transformers were removed from the 1930 substation, which was thereafter used for control gear, a switchboard and the storage of equipment. Following reform of the electricity sector, the AEPB was corporatised in 1994 to become Mercury Energy Limited and subsequently Vector Limited. The building was refurbished in 2002 and remains in use for public utility purposes associated with local electricity distribution.

The former AEPB Substation has aesthetic significance as a visually striking building of symmetrical form exhibiting polychromatic brickwork and Art Deco-influenced plaster detailing. The place has architectural value as a well-preserved example of a purpose-designed electricity substation of early twentieth-century date. The substation has particular historical significance for its 60-year association with the AEPB, a body responsible for electricity distribution to New Zealand’s largest commercial centre, and for reflecting an expansion of suburban electricity demand during the early twentieth century and later. The place has social significance as a place that facilitated radical change in the domestic environment and the role of women in the home through the introduction of electric lighting, water heating and electrical appliances that modernised housework.

Assessment criteriaopen/close

Historical Significance or Value

The place has significance for its connections with the history of electricity generation and supply in New Zealand, and in particular as part of a secondary transmission system developed under an electricity supply model instituted by the state in 1917-18 under which electricity generation and supply was acknowledged as an essential part of the country’s infrastructure. The place demonstrates the spreading of the electricity network into suburban areas linked with the increasing use of electricity for domestic purposes.

Aesthetic Significance or Value:

The place has aesthetic value as a visually striking building of well-planned symmetrical form which exhibits subtle polychromatic brickwork, stylised Art Deco-influenced detailing, and clean lines. Its aesthetic significance is enhanced by the building’s landmark location on a notable corner site close to two major thoroughfares that provide access across the Auckland isthmus, and between the southern suburbs and the Auckland CBD respectively.

Architectural Significance or Value:

The place has architectural value as a well-preserved example of a purpose-designed electricity substation of early twentieth-century date. It has particular value as an interpretation of a classical architectural style traditionally associated with public and civic architecture, adopted for an essentially utilitarian structure in a suburban residential location. The place also has architectural value as a late 1920s architectural design commissioned and possibly formulated by the Auckland Electric Power Board.

Social Significance or value:

The former AEPB Substation has social significance as a place that facilitated radical change in the domestic environment and the role of women in the home through the introduction of electric lighting, water heating and electrical appliances that modernised housework. The place has remained in continuous use for purposes associated with the provision of an important public utility to the local community for eight decades.

(a) The extent to which the place reflects important or representative aspects of New Zealand history

The place reflects the development of modern electricity reticulation and supply in 1920s and 1930s and the provision of utility infrastructure by one of many local authorities elected across the country for the purpose of distributing current from a state electricity transmission system. The place also reflects the growing use of electricity in the home after the 1920s, and strategies to cope with on-going demand and changing technology over the following eight decades.

(b) The association of the place with events, persons, or ideas of importance in New Zealand history

The place has significance for its six-decade association with the Auckland Electric Power Board, an elected body formed in 1922 to distribute electricity to New Zealand’s largest commercial centre; and as one of three electricity substations constructed in Auckland in 1930 in anticipation of completion of the Arapuni hydro-electric project on the Waikato River enabling phasing out of the 1913 King’s Wharf coal-fired station.

(g) The technical accomplishment or value, or design of the place

The place is of value as a striking example of a 1930s suburban electricity substation of an aesthetically accomplished design illustrated in elements such as the classical form and overall symmetry of the composition, fine brickwork, and the incorporation of modern materials and references including metal-framed windows and detailing that expresses simple lines befitting of modern electricity technology. The electricity substation function is accommodated by a design that provides sizeable doors enabling the positioning or removal of plant with minimal risk and loss of time, tall height to accommodate a mezzanine and gantry crane for the positioning of the equipment, and louvre doors and roof vent that induced natural ventilation assisting temperature control of the transformers.

(k) The extent to which the place forms part of a wider historical and cultural complex or historical and cultural landscape

The place is part of a broader historical and cultural landscape in south Epsom, which includes an extensive pa site at Maungakiekie, early twentieth-century public parks at Cornwall Park and One Tree Hill Domain, a significant memorial to John Logan Campbell, the former Costley Home for the Aged Poor and other structures at Green Lane Hospital, and several notable residences. Other significant structures linked with the provision of public services in the area include a former post office building in Manukau Road.

Summary of Significance or Values

This place was assessed against, and found it to qualify under the following criteria: a, b, g and k.

Conclusion

It is considered that this place qualifies as a Category II historic place.

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Construction Professionalsopen/close

Grinter, Albert George

Albert (Bert) George Grinter (1882-1974) worked as a builder on his own account in the South Island from circa 1910 until 1922 when he set up business in Auckland. By 1945, when it was renamed A.G. Grinter and Son Limited, the firm diversified into the manufacture of joinery to meet its own needs and those of other builders. During the Second World War (1939-45), the company specialised solely in construction.

Grinter undertook a wide range of construction work including schools, churches, hospitals and residential projects including private dwellings and blocks of state housing. In 1925-6 Bert Grinter won a contract for the construction of Stoneways, the Epsom residence of eminent Auckland architect William Gummer. In 1930, Grinter also erected a brick electricity substation for the Auckland Electric Power Board at The Drive in Epsom.

Additional informationopen/close

Historical Narrative

Early history of the site

The former Auckland Electric Power Board (AEPB) Substation lies near the western slopes of One Tree Hill (Maungakiekie), the site of a large pa occupied for several centuries prior to colonial arrival. According to one perspective, a community was established on the hill at some time between the fifteenth and seventeenth centuries by Ngati Awa chief Titahi and his people, who had migrated to the area from Northland. By the early eighteenth century Maungakiekie was the domain of Te Waiohua, whose leader Kiwi Tamaki increased its defensive capabilities. The Auckland isthmus was subsequently conquered by Ngati Whatua in 1741, after which Te Taou chief Tuperiri is said to have built a new pa on the site which he renamed Hikurangi. Tuperiri is stated to have still been in residence in the 1790s.

Subdivided into farms as early as 1842, the wider Epsom area became renowned for its large country homes and later as a prestigious suburb. The site on which the AEPB substation was later erected straddled the boundary of two 1842 Crown Grants (Allotments 29 and 30). The land parcels, two of several settler farms in the area, lay near a windmill constructed in circa 1843 for William Mason (1810-1897) New Zealand’s first Superintendent of Public Works. John Bycroft, who bought the mill in partnership with another, owned Allotment 30 from 1847 but sold in 1861 after which the land was frequently subdivided.

Residential development in the southern part of Epsom accelerated in the early 1900s as the suburban location became increasingly accessible due to electric tram services and the private motor car. The future substation site, created in 1914 as part of the extension of a residential development promoted as the Town of Tui, changed hands a number of times prior to its purchase in May 1929 by the AEPB. An existing house was removed to enable construction of an electricity substation to serve the recently reticulated Epsom area.

Electricity supply in Auckland and the reticulation of Epsom (1900-30)

Construction of the Epsom electricity substation occurred in 1930 and was part of the broader development of a publicly owned, unified electricity transmission system to connect diverse isolated facilities in the North Island. The proposed Epsom utility was linked to the widening use of hydro-electric power and efforts throughout the 1920s to create mass consumption through ‘load building’ to provide the economies of scale associated with the development of power stations on Mangahao, Arapuni and Waikaremona. Domestic electricity use, mostly limited to lighting and ironing in the 1920s, expanded after 1925 the year Dunedin-based Shacklocks began to manufacture electric stoves.

Electricity was first used in New Zealand in 1861, but it was not until the State Supply of Electrical Energy Act 1917 and the Electric Power Board Act 1918 that supply was statutorily acknowledged as an essential part of the country’s infrastructure. Under the new regime the state assumed primary responsibility for construction and operation of generation projects and the supply of electricity at wholesale rates to specially elected local authorities via government substations. Supply authorities retailed the energy through their own secondary transmission systems, in which electricity substations converted current from the grid network to a suitable voltage for local consumer supply.

The AEPB was established in 1922, and was the first of the three power boards in place in the Auckland region by 1924. Charged with distributing electricity to New Zealand’s largest commercial centre, the AEPB administered a supply area taking in the Eden and Manukau Counties. The new body took over the assets of the Auckland City Council Electricity Department founded in 1908. In 1922 a coal-powered thermal station constructed at Kings Wharf in 1913 was the main source of electricity supply.

Electricity mains had been laid in Epsom as far as Owens Road by mid 1915. Growing electricity demand had overtaken planned supply from an ‘Epsom Substation’ opened in Gillies Avenue in 1917. Reticulation of the wider Epsom locality was well underway by 1923.

To popularise electricity use in the home in anticipation of supply from the Arapuni hydro-electricity project then under construction on the Waikato River, the AEPB introduced a domestic tariff in late 1924 to reduce the cost of power to potential residential consumers. By 1926, the government had interconnected existing electricity generation plants in the Auckland and Waikato regions. Electric ranges were increasingly being installed in homes by the late 1920s, along with storage water heating and other appliances, the cost of which was dramatically dropping. ‘The “all electric” home, it was said, would relieve women from domestic drudgery and replace the domestic with the “electric servant”’. Although electricity generation commenced at Arapuni in June 1929, geotechnical problems extended Auckland’s reliance on the Kings Wharf source until April 1932.

Construction of the Epsom substation (1930)

The Epsom substation was built in 1930, the year the AEPB celebrated the opening of its eight-storey Art Deco headquarters on Queen Street.

Extending an earlier Auckland City electricity framework that included existing substations at Gillies Avenue and Ponsonby, the Epsom facility was one of three new substations under construction in 1930 as part of an expanding distribution network. The two others erected in1930 were located in Minto Road, Remuera and Great North Road, Point Chevalier. All three were built in residential neighbourhoods, within a block of local shopping centres and major arterial roads.

Early New Zealand substation buildings were traditionally designed with high roofs to enable power lines to be brought to the structure while maintaining adequate safety clearance. By incorporating cable trenching in the sub-floor of the Epsom structure, an architecturally traditional tripartite classical design with a flat roof was possible.

Reflecting AEPB’s municipal origins, the Epsom substation building was of Stripped Classical design with Art Deco influences, a modern interpretation of the classical style favoured for public buildings on account of associations with grandeur and stability. The design expressing strong lines invited public confidence in the safety, worth and long term viability of electricity as a new energy form.

The façade and the south elevation of the tall, brick structure were divided into rectangular bays by pilasters. Metal-frame windows and cement plaster dressings expressed modernity. The incised lettering ‘AEPB 1930’ matched the clean lines of plasterwork elsewhere on the structure, and a stylised flower-like symbol and strigulation possibly represented hydro-electric power generation. Aspects of the form of the building were influenced by its function. Sizeable doors enabled the positioning or removal of plant with minimal risk and loss of time. Louvre doors and a roof vent induced natural ventilation, assisting temperature control for the transformers.

Internally, a mezzanine extended along the centre of the building and adjoined the transformer bays. A gantry crane, an internal fixture, enabled heavy machinery to be lifted into place. Pairs of windows (one upper, one lower) in the front bay, and the bays along the south elevation provided natural light to the interior. A low brick wall ran along the front boundary.

The identity of the designers of the AEPB substations of the era is not known. The lack of a name or accreditation to an architectural or engineering practice perhaps suggests that the plans were prepared by the AEPB. Revisions made just days before the building permit was issued could indicate the hand of an Auckland-based draughtsman. It has also been suggested that A.M. Bartley and H.G. Wade, the architects the AEPB’s Queen Street headquarters opened at this time, might have played some role.

The construction contract was won by builder Bert Grinter (1882-1974) who had worked as a builder on his own account in the South Island for over a decade before relocating to Auckland in 1922. In 1925-6 Grinter had won the contract for construction of Stoneways, the Epsom residence of eminent Auckland architect William Gummer.

Subsequent use (1931 to present)

Epsom was fully reticulated for electricity by the early 1930s. Local residents to benefit from the new service would have included AEPB secretary-treasurer Norman McLeod Speer (1894-1963) and the general manager Howard Bartley (1886-1959) formerly AEPB chief engineer. By 1939 most of the North and South Island were internally interconnected, and electricity was being supplied to 92 per cent of the population.

Increasing electricity demand resulted in cuts of 20 per cent being imposed on the electrical supply authorities between March and August in 1946 and 1947. The AEPB responded by disconnecting residential areas in rotation for 30 minute periods. Concerned that the measure was insufficient, the use of domestic water heaters was prohibited during prescribed hours. Those caught taking a hot bath outside the permitted times faced a £200 fine or twelve months in prison.

The following year, in 1948, a two-bay concrete addition was made to the rear of the Epsom substation to accommodate two, more efficient transformers. The window in the rear wall was bricked up and a lavatory cubicle may have been constructed in the corner of the building at this time.

In 1951, the original transformers were removed from the four rear bays of the substation. The associated north-facing louvre openings were bricked in and plastered, enabling use of the internal space for equipment storage. At this time also, the remaining three 1930-era transformers were replaced by more efficient models similar to the 1948 equipment.

Construction of a high capacity inter-suburban traffic route to link Balmoral to Green Lane and the Auckland-Hamilton motorway in the 1970s increased the visual prominence of the Epsom substation. The adjoining residential properties in the vicinity were acquired and demolished to facilitate construction of the new route, leaving the 1930 substation located at a busy intersection. Public views of the facility were no longer confined to the west elevation facing The Drive.

In 1972 the AEPB expanded the size of its holding by acquiring the remaining residential property between the substation and Green Lane West, and constructed a freestanding concrete block transformer structure of four bays. Unlike the earlier building, the design of the new structure was primarily utilitarian, although at least one wall incorporated bands of decorative breeze-blocks. The three surviving (1951) transformers were removed from the original substation, freeing up the structure for control gear, a seven-panel 22 kV switchboard and the storage of equipment.

National electricity shortages in the 1970s, at times the result of abnormally dry conditions affecting storage lakes, brought a reduction in television broadcasting hours, cuts in hot water, and some daily blackouts over several months in the winter of 1973.

The primary voltage of the Epsom substation was upgraded from 22 kV to 33 kV in 1977, the year an adjoining residential property to the south was purchased. Following use as a temporary AEPB depot, the recently acquired property was subdivided and returned to residential use in 1991. The 1972 structure located to the northeast of the original substation was altered in circa 2000 with the addition of a roof over what was formerly the open half of the building.

In 1986 economic reform of the state electricity sector saw the creation of the Electricity Corporation of New Zealand. Following subsequent reform of electrical supply authorities, the AEPB was corporatised in 1994 and became Mercury Energy Limited, a company owned by the Auckland Energy Consumer Trust. To comply with a later series of reforms, Mercury sold its electricity retail business in 1999 along with its interest in electricity generation; and changed its name to Vector Limited.

In 2002, the year Vector became New Zealand’s largest multi-utility company, the 1948 addition to the Epsom substation was demolished and the 1930 structure was refurbished. A door was added in the rear wall. Maintenance work was undertaken on the interior, which accommodated a switch room, storage areas, a mezzanine, toilets and passage. The building’s historic gantry crane was retained.

In the grounds, rail tracks between the 1930 substation and the 1972 structure were removed, the concreted access between the two buildings was re-laid and new planting was undertaken. Security lighting was installed, highlighting the west façade.

The place remains in use as a public utility and continues to serve the broad purpose of local electricity distribution.

Physical Description

Context

The former AEPB Substation is located to the west of the Manukau Road and Green Lane West shopping centre in south Epsom. Epsom is an inner suburb of Auckland, lying to the south of the city centre. Part of a predominantly residential area, The Drive is one of two principal connectors to Gillies Avenue which draws traffic from the southern isthmus suburbs. The Drive is located two main blocks to the west of the extensive pa at Maungakiekie, which lies within a part of a large open space formed by Cornwall Park and One Tree Hill Domain. The latter contains numerous structures associated with John Logan Campbell - the ‘Father of Auckland’ - including Acacia Cottage (Record no. 525, Category I historic place), the John Logan Campbell Monument (Record no. 4478, Category I historic place) and the One Tree Hill Obelisk (Record no. 4601, Category I historic place).

Other surviving components of the historical landscape in south Epsom include St Andrews Anglican Church (Record no. 116, Category I historic place), and the nineteenth-century Costley Home for the Aged Poor and later buildings comprising part of the Green Lane Hospital on Green Lane West (Record no. 4536, Category I historic place). Notable Arts and Crafts-style residences in the vicinity include houses in Merivale Avenue, Gardner Road and Claude Road.

The 1930 electricity substation is located at the southeast corner of the traffic controlled intersection at The Drive and Green Lane West. Green Lane West is the principal east-west route across the central isthmus. The location, scale and design of the substation building make it a well-known landmark.

Site layout

The 1930 substation building occupies the southern portion of a level, slightly L-shaped plot of 1207 square metres. A timber fence runs along the north boundary with the arterial road; a pipe and mesh fence and plantings delineate the boundary with The Drive. A smaller rectangular transformer building dating from 1972 is located within the northeast portion of the site.

The tall brick substation is sited close to the front boundary with The Drive. Orientated on a west-east axis the structure extends almost the length of the site, parallel to the south boundary and is separated from adjoining residential properties by generous yards and planting. A concrete drive accessed mid-way along the frontage runs along the north side of the building. The northwest area of the site, in front of the 1972 transformer building, is in lawn enabling appreciation of the 1930 substation as a freestanding structure.

Main building - exterior

The early twentieth-century electricity substation is a simple brick structure of Stripped Classical style with Art Deco influences. It has cement plaster dressings. In accordance with its original purpose as an important public utility and its singular function in an otherwise residential environment, it is freestanding. The overall form of the building is as important as the facades and detailing, and provides large interior spaces.

The tripartite nature of the composition is conveyed by horizontal plaster detailing that encircles the building. This takes the form of a shallow base; spandrels, lintels and banding; and a simple entablature. Immediately above is a brick parapet. Pilasters give visual depth to the front (west) and side (south), and the westernmost bay of the north elevations. The well-articulated composition, simple plaster detailing and polychromatic brick simulating quoin work contribute to the aesthetic quality of the place.

While each of the three main elevations is of strictly symmetrical composition, the design of the elevations differs one from the other as determined by functional requirements.

The façade to The Drive retains its original 1930 appearance. Single bays either side of the entrance have a spandrel with a four-petal flower symbol, a motif recurring in the panel above the entrance and on the south elevation. The large scale of the heavy timber doors, and an absence of fenestration and of door furniture, indicate the semi-industrial purpose of the structure and prohibition of public access.

The south elevation of the substation remains unaltered. A door has been added to the rear elevation. The former location of a window bricked up in 1948 is evidenced by a surviving plaster lintel.

The infilling of the four westernmost transformer bays represents the most significant external alteration to the exterior, but does not compromise the overall form or appearance of the structure. Their former location relative to the three surviving pairs of timber louvre doors of the substation transformer bays, remains legible. Heavy metal strap hinges, an attractive rectangular pattern in the woodwork of the louvres, and the use of polychromatic brick for quoin work evoke Arts and Crafts associations with fine craftsmanship. Art Deco detailing on the plasterwork suggests the machine age and modern technology including electricity.

The parapet and north-facing roof ventilator retain their original form.

Main building - interior

The building has two main access points: one centrally located in the front (west) elevation; the other in the westernmost bay of the north elevation. There is also a small door at the east end of the structure.

The current layout of the interior is unknown. However, it is understood from 2002 correspondence on the NZHPT file for the place that the facility contains a switch room, equipment storage areas, toilets and passage on the ground floor; and a centrally located mezzanine above. The mezzanine is a surviving original feature and a gantry crane is understood to be of similar era.

Transformer structure (1972)

The transformer structure consists of a four-bay structure constructed of brick and concrete block work. The transformer bays do not have floors. The metal roof is constructed in two sections, and stands slightly above the structure to enable ventilation of transformers and coolers.

Comparative examples (1930)

The Minto Road AEPB substation in Remuera is an Art Deco-style structure of notably different design to the Stripped Classical structure erected the same year at The Drive in Epsom. The Remuera substation is a substantially wider building and of lower overall height. It is also of a more ‘modern’ appearance, of a type more commonly associated with electricity distribution in the 1930s and 1940s.

The Great North Road substation at Point Chevalier has been replaced by a modern structure of circa 1970s appearance and construction.

Construction Dates

Addition
1948 -
Two transformer bays constructed in concrete

Modification
1948 -
Partition wall removed within the rear of the building, window opening bricked up; lavatory constructed in southeast corner (ground floor)

Modification
1951 -
Four (1930) transformers removed, louvre doors removed from four easternmost bays, openings bricked in and plastered; remaining three (1930) transformers replaced

Original Construction
1972 -
Freestanding transformer structure

Modification
1972 -
Removal of remaining three (1951) transformers from original substation; seven-panel switchboard installed

Modification
1977 -
Primary voltage of substation upgraded from 22 kV to 33 kV

Modification
2000 -
Construction of roof over open half of (1972) transformer building

Partial Demolition
2002 -
Two-bay addition (1948) of original substation

Modification
2002 -
Door installed in rear wall of original substation

Original Construction
1930 -
Brick substation accommodating transformers

Construction Details

Concrete footings; brick walls; roof not known (1930 structure)

Concrete piles; brick and concrete block walls; metal roof (1972 structure)

Completion Date

22nd July 2010

Report Written By

Joan McKenzie

Information Sources

Bush, 1977

G.W.A Bush, Decently and In Order: The Centennial History of the Auckland City Council, Auckland, 1977

King, 1972

J King, Sign of Service: A History of the Auckland Electric Power Board, 1922 - 1972, Auckland, 1972

Martin, 1998

J. Martin, People, politics and power stations: electric power generation in New Zealand 1880-1998, Wellington, 1998

Bush, 2006

G.W.A Bush, (ed.), The History of Epsom, Auckland, 2006

Bloomfield, 1973

G.T. Bloomfield, The Evolution of Local Government in Metropolitan Auckland 1840-1971, Auckland, 1973

Reilly, 2007

Helen Reilly, Connecting the Country: New Zealand’s National Grid 1886-2007, Wellington, 2008

Other Information

A fully referenced registration report is available from the NZHPT Northern Region Office

Please note that entry on the New Zealand Heritage List/Rarangi Korero identifies only the heritage values of the property concerned, and should not be construed as advice on the state of the property, or as a comment of its soundness or safety, including in regard to earthquake risk, safety in the event of fire, or insanitary conditions.