One town, two councils, one sampling circle
Harrow's own appraisal notes that the borough boundary between Barnet and Harrow runs along the middle of Edgware High Street, so any set of figures for the town has to straddle two councils. Rather than follow either, this guide samples national records inside a circle of 750 metres round the Underground station, about 176.7 hectares, and adds the councils' Edgware documents.
On planning.data.gov.uk, two conservation areas reach into the circle at its edges, The Watling Estate in Barnet and the Canons Park Estate in Harrow, and together they cover only about 7% of it, so both are treated as context. Burnt Oak Underground station lies about 680 metres beyond the edge. The Barnet guide and the Harrow guide cover the two boroughs.
What the records show around the station
Every statement below links to the public record it comes from; sources were re-checked on .
A suburb built between the wars
Five LSOAs have at least half their area inside the circle, Barnet 018A to 018E, codes E01000192, E01000193, E01000194, E01000226 and E01000227, and they hold about 3,560 dwellings in the VOA council tax stock of properties for 2025, counted to the nearest 10; all five are in Barnet, so Harrow-side homes do not feed into these figures.
The build-period table puts 71.3% of the dwellings in 1919-1939, far ahead of the next period, 2000 onwards, at 11.0%, and only 0.6% before 1900.
Harrow's Edgware High Street appraisal gives the background: the Underground's extension to Edgware opened it to substantial suburban development, and by the early 1930s shops, cinemas and offices lined Station Road and drew the centre of the town towards the terminus.
Semi-detached houses at 37.4% almost match flats and maisonettes at 37.9% in the type counts, with terraced houses at 16.3% and detached at 7.0%; band E is the largest council tax band at 33.1%, and F to H hold 18.0%.
In a stock this dominated by inter-war dwellings, an inspection is largely about later change, such as loft conversions, removed chimney breasts, new roof coverings and extensions built against the original shell, none of which the VOA tables can show.
London Clay and the brook
Every one of five sample points is London Clay Formation on the BGS 1:50,000 bedrock layer, and the superficial layer records no deposit over any of them.
Clay at or near the surface shrinks in dry summers and swells in wet winters, moving shallow foundations most near large trees, so where the geology viewer shows bare clay, cracks are logged by position, width and whether they open and close with the seasons.
The Environment Agency's Flood Map for Planning places 9.8% of the circle in Flood Zone 3 and 6.0% in Flood Zone 2, with rivers as the source in both.
Harrow's appraisal traces the name Edgware to a weir or fishing pool on the Edgware or Dean's Brook, south of the old settlement, and the planning map shows how close the river zones come to a given address.
Planning zones take no account of defences or surface water and are not drawn for single buildings, so an address is also run through the long-term flood risk service.
Conservation areas and listing
The Watling Estate conservation area in Barnet, designated on 8 April 1998 according to planning.data.gov.uk, overlaps the circle by about 9.6 hectares, or 5.4%.
Harrow's Canons Park Estate conservation area reaches in for about 2.8 hectares, or 1.6%, with no designation date on its national record, and the council's Stanmore and Edgware conservation areas page marks an Article 4 direction for it, so an owner there checks which rights it removes before treating an external change as permitted.
Canons Park, a Grade II registered park and garden, touches the circle for about 0.73 hectares, and the national list service returns 14 list entries inside the circle, every one at Grade II, with no scheduled monument.
The High Street's older fabric
Harrow adopted its Edgware High Street appraisal in December 2013 as an appendix to the Stanmore and Edgware SPD, and records that the conservation area was designated in 1980 for 81 to 111 High Street, odd numbers only, and extended in 1991 to the shopping parade at 1-12 Whitchurch Lane.
That area lies on the Harrow side of the High Street facing Barnet, and it is not among the polygons planning.data.gov.uk returns for the circle, so its line is taken from the council's maps; the council's table shows no Article 4 direction for it.
The appraisal describes timber-framed High Street buildings from the 16th to 18th centuries, mostly hidden behind colour-washed brick or cement render, and warns that modern cement render is damaging to the historic fabric beneath because it is not breathable.
For any of those buildings, trapped moisture and the condition of the frame behind the finish are priorities at inspection, and the same document shows first floors on both streets as flats, with flat-roofed rear extensions on the High Street that all but hide the original frames.
Town-centre plans and shared houses
Harrow's Edgware Growth Area SPD page says the two councils adopted the document jointly to guide the renewal of Edgware Town Centre and support redevelopment of key sites, and adds that SPDs lack Development Plan status but are considered in planning applications.
Only one direction from the national Article 4 register falls on the circle, Small Houses in Multiple Occupation Area 1, with a record start date of 29 May 2016 and 84.9% coverage; inside it, turning a house into a small shared house needs planning permission, so a house already let to sharers comes with questions about the consent behind that use.
Local guides and practice services
Guides in the first list each take one type of instruction for homes in and around the town, from inter-war semis to flats over shops; the second list links the general service page for each.
Neighbouring guides
Borough-wide context is in the Barnet guide and the Harrow guide. Stanmore, Mill Hill, Hendon and Colindale have guides of their own, each based on a separate study area.
Questions about property near the station
Why does this page use a circle instead of a conservation boundary?
The two conservation areas that planning.data.gov.uk returns for the circle cover only 5.4% and 1.6% of it, and the town straddles Barnet and Harrow, so a 750-metre circle round the NaPTAN station point takes in parts of both boroughs. It is an analysis device only, and no record treats it as a boundary.
Is there an Article 4 direction on Edgware High Street?
Harrow's conservation table answers no for the Edgware High Street conservation area and yes for the Canons Park Estate. The 2013 appraisal still sets out how the council regards shopfronts, roofs and render on the older High Street buildings.
Do the inter-war houses near the station stand on clay?
On the BGS 1:50,000 map they do: London Clay is the bedrock at all five sample points, with no superficial deposit recorded. Clay moves as its moisture changes, so trees, drains and any earlier underpinning are all considered when a crack is assessed.
Which parts of the circle fall in a river flood zone?
Flood Zone 3 covers 9.8% and Flood Zone 2 covers 6.0% on the Environment Agency's planning map, all from rivers, and the map shows where those shares lie. The zones ignore defences and surface water, so the address also goes through the long-term flood risk check.
Does the HMO direction matter when buying a family house?
Only if the plan is to let it to sharers. The Area 1 direction covers 84.9% of the circle and requires planning permission for a change to a small house in multiple occupation, so a house already in shared use comes with questions about the consent behind it.
What does the joint growth area document aim to do?
Harrow's page on the Edgware Growth Area SPD says it guides the renewal of the town centre by supporting redevelopment of key sites to provide new public spaces and a more attractive street environment. It is guidance taken into account in planning applications, not part of the Development Plan.
How we work on an instruction
Hampstead Chartered Surveyors is a RICS-regulated firm (RICS Regulated Firm No. 923064) working from its registered Hampstead NW3 office. The firm does not claim premises, staff or completed instructions in an individual locality, and it does not treat a neighbourhood name as evidence about a particular building.
An instruction starts with the full address, the decision the client faces and the documents already available, such as leases, drawings, notices or earlier reports. The scope, fee and inspection date are confirmed in writing only after that review, and access to roofs, lofts, basements or common parts is agreed before the visit.
Reports include RICS Level 2 and Level 3 home surveys, building and defect investigations, party wall appointments, reinstatement cost assessments, contract administration and schedules of condition. Each report records what was inspected, what could not be seen and what further investigation the evidence supports.
Public datasets such as the conservation-area register, the National Heritage List for England, British Geological Survey mapping, the Environment Agency flood map and Valuation Office Agency housing statistics describe areas rather than individual properties. They frame questions before an inspection; they never replace it.
Reviewed by Savas Bulduk BSc (Hons) MRICS, Director & Chartered Building Surveyor at Hampstead Chartered Surveyors & Building Consultancy. Last reviewed: . Our people · RICS firm record