Three designations, read together
Pinner lies in the London Borough of Harrow, and this guide treats three of its conservation areas, High Street, Waxwell Lane and East End Farm, as one study area of about 11.7 hectares. Each keeps its own boundary and council documents, so the combined figures below describe the group rather than any single street.
Housing statistics come from surrounding statistical areas rather than from the designations themselves, which makes them a guide to the wider neighbourhood rather than to the conservation areas. For the borough as a whole, the Harrow guide is the starting point.
What the public records show for the three areas
Every statement below links to the public record it comes from; sources were re-checked on .
Boundaries and council documents
Planning.data.gov.uk maps the High Street conservation area at about 6.6 hectares, Waxwell Lane at about 3.7 hectares and East End Farm at about 1.4 hectares, and none of the three records carries a designation date.
Harrow Council has a web page for the Pinner conservation areas, which is the place to confirm the current position on any of them.
The council also publishes an appraisal and management strategy for the High Street, a further High Street conservation area document, a Waxwell Lane appraisal and management strategy and an East End Farm conservation area document.
An appraisal sets out what the council values in a conservation area, so the one for the street concerned, such as the Waxwell Lane appraisal, is read before an extension, a roof change or a new window pattern is proposed.
The Article 4 dataset on planning.data.gov.uk holds no polygon for these areas; since that does not prove none exists, the council's conservation pages are checked before permitted development is assumed.
Listed buildings
Thirty-seven list entries lie inside the three boundaries according to the National Heritage List data as queried on 1 November 2026, of which 34 are Grade II.
The remaining three, all Grade II*, are the Church of St John the Baptist, Pinner House and East End Farm Cottage.
With 37 entries across less than 12 hectares, listing is checked for the address itself and for attached walls and outbuildings in the NHLE record, since a single entry may take in a group.
Even an unlisted house beside one of these entries can be affected, because the setting of a listed building is a planning consideration, and the NHLE data shows which neighbouring buildings are on the list.
Lambeth Group ground
The Lambeth Group, a unit the survey lists as clay, silt and sand, is the bedrock at every one of five sample points on the British Geological Survey's 1:50,000 geology map, and no superficial deposit is recorded over it.
The Lambeth Group is a mixed sequence that changes over short distances, with clay-rich beds that can shrink and swell and sandier layers that drain more freely, so the BGS mapping only frames what the inspection looks for.
Where an older house stands on shallow footings, the age and pattern of its cracking tell more than mapped geology can, which is why the BGS viewer is a starting point and not a conclusion.
River flood zones
The Flood Map for Planning places 6.0% of the combined study area in Flood Zone 3 and 3.3% in Flood Zone 2, all from rivers.
Because planning flood zones ignore defences and say nothing about an individual building, an address in or close to those parts is also looked up in the government's long-term flood risk checker, surface-water layer included.
Housing around the conservation areas
Three surrounding LSOAs, E01002189, E01002188 and E01002187, hold about 2,260 dwellings in the 2025 council tax stock statistics from the VOA, with each count rounded to the nearest 10.
The VOA build-period table dates 38.1% of those dwellings to 1945-1972, 21.2% to 1919-1939, 17.7% to 1973-1999, 12.8% to 1900-1918, 6.2% to 2000 onwards and 3.1% to before 1900.
Detached houses form 34.5% of the stock and flats or maisonettes 35.4% in the type counts, with semi-detached houses at 15.5%, terraced houses at 10.6% and bungalows at 4.9%.
Bands F to H hold 53.5% of dwellings in the VOA band table, and band G alone holds 35.4%.
Those are surrounding LSOAs rather than the three designations, so the VOA figures describe the surrounding neighbourhood and should not be read as a profile of the conservation areas themselves.
Pages for specific instructions
Each local page below concentrates on a single kind of instruction for properties here, and the practice-wide pages describe how the same work is approached elsewhere.
Nearby guides on this site
The Harrow guide covers the borough as a whole, and Harrow on the Hill has a separate guide to the conservation areas on the hill; further guides deal with Wembley, Moor Park and Rickmansworth, with Chorleywood and Amersham beyond Greater London.
Pinner property questions
Which conservation area is my Pinner address in?
There are three in this study area: High Street, Waxwell Lane and East End Farm, covering about 11.7 hectares together. Check the exact address against each mapped boundary, because neighbouring streets can fall outside all three.
Does a Grade II* building nearby matter for my own plans?
It can. Pinner House, East End Farm Cottage and the Church of St John the Baptist are the three Grade II* entries in the NHLE data. Work affecting the setting of a listed building is a planning consideration, so the council may comment even when your own house is unlisted.
What does Lambeth Group ground mean for a house?
The BGS map shows the Lambeth Group at all five sample points: a mix of clay, silt and sand that changes over short distances. Clay layers can move with moisture and trees, so cracking is read in context rather than blamed on the ground by default.
Are post-war homes common around the conservation areas?
Yes. In the three surrounding LSOAs the VOA 2025 figures date 38.1% of dwellings to 1945-1972, the largest single period, and only 3.1% to before 1900. Construction type is therefore confirmed for each address rather than assumed from the conservation-area setting.
How should I approach a window or roof change on the High Street?
Read the council's High Street appraisal and management strategy first, then ask Harrow Council whether any Article 4 direction applies. Front elevations and roofs are a common focus of conservation-area control, so drawings and photographs of the existing building help.
What paperwork is useful for an older Pinner house?
Any listing description, past planning and listed building consents, building control certificates for extensions, and records of underpinning, timber treatment or roof work. For a flat, add the lease and service-charge accounts. Knowing what has been altered helps separate original fabric from later changes.
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