Where the records start
Three Rivers District Council is the planning authority for Chorleywood, which is in Hertfordshire and outside Greater London. On planning.data.gov.uk two conservation areas are recorded here: the Common, at about 130.6 hectares, and the Station Estate, at about 14.8 hectares, with record start years fourteen years apart.
This guide has no London regional parent, and the areas index gives the full list of places covered. Every figure below links to where it was found, whether that is the conservation-area register, Historic England, the British Geological Survey, the Environment Agency or the VOA.
Public records for the two conservation areas
Every statement below links to the public record it comes from; sources were re-checked on .
The Common and the Station Estate
The Chorleywood Common conservation area, reference 8987 on planning.data.gov.uk, covers about 130.6 hectares and carries a 1976 start year with no day recorded (the date the dataset uses for a designation or its latest boundary change).
The Station Estate conservation area, reference 8988, is much smaller at about 14.8 hectares, with a record start date of 26 September 1990.
Between them the two boundaries take in about 145.4 hectares, of which the Common accounts for roughly nine-tenths.
Three Rivers keeps a web page for the Common conservation area and a PDF on the Station Estate, and both deserve a read before a window, roof or boundary change is drawn up.
A house near the edge of the Common can fall on either side of the line, so the mapped boundary is compared with the title plan rather than inferred from the street name.
The planning.data.gov.uk Article 4 dataset shows no direction over either area, which is not proof that none exists, so the council's Common conservation area page is the place to confirm what controls apply today.
Listed buildings
Eighteen list entries fall inside the two boundaries according to the NHLE listed-building layer, queried on 1 November 2026: 17 at Grade II and one at Grade II*.
The Grade II* entry is Christchurch, and neither conservation area contains a Grade I building.
With 18 entries spread over roughly 145 hectares, most houses here are unlisted, and the controls that usually bite come from conservation-area status rather than from the National Heritage List.
Gravel over chalk
The British Geological Survey 1:50,000 bedrock layer places all five sample points on the Seaford Chalk Formation.
Above the chalk, the superficial deposits layer maps sand and gravel of the Chorleywood Gravel Member at four points and nothing at the fifth.
Gravel drains freely and does not shrink like clay; on ground the BGS maps as gravel, cracking is therefore first weighed against drainage leaks and soakaways that can wash fine particles out.
Chalk can develop solution features where water is concentrated, so a long-running leak or an old soakaway near a house on mapped chalk is noted and, if movement is seen, investigated further, with the geology viewer used only as background.
Flood zones
The Environment Agency's Flood Map for Planning shows neither conservation area reaching Flood Zone 2 or Flood Zone 3.
That map concerns rivers and the sea, takes no account of defences and is not drawn for single properties, so surface water is looked up separately for the address on the check your long-term flood risk tool.
Housing in two surrounding LSOAs
Two surrounding statistical areas, E01023817 and E01023814, hold about 1,210 dwellings in the Valuation Office Agency's 2025 stock of properties, where each count is rounded to the nearest 10.
Of those, 28.1% date from 1973-1999 and 27.3% from 1945-1972 in the build-period table, with 13.2% before 1900, 12.4% from 2000 onward, 9.9% from 1919-1939, 6.6% from 1900-1918 and 0.8% of unknown date.
Flats and maisonettes, at 33.9%, edge ahead of detached houses, at 31.4%, in the property-type figures; semi-detached houses are 14.0%, bungalows 10.7% and terraces 9.1%.
Band G alone holds 28.1% of dwellings in the council tax band counts, part of a 59.5% share across bands F to H.
These LSOAs only approximate the area and are not a conservation-area figure, but the VOA data shows that houses and flats built after 1945 are far more common than older ones, which affects the drawings, consents and warranties an owner is likely to hold.
Guides already written for the area
One local guide is listed first, followed by the practice-wide page that sets out how that type of instruction is scoped and priced.
Practice-wide services
Neighbouring guides
Rickmansworth and Moor Park share the Three Rivers planning authority and each has a page, Amersham is across the county line in Buckinghamshire, and Watford has its own borough council; the areas index covers everywhere else.
Questions about the Common, the estate and the ground
Are the Common and the Station Estate one conservation area or two?
Two. Planning.data.gov.uk lists them separately: the Common covers about 130.6 hectares with a 1976 start year, and the Station Estate covers about 14.8 hectares with a record start date of 26 September 1990. Each has its own boundary, so confirm which one, if either, includes the address.
Is the ground here chalk or gravel?
Both, in layers. Seaford Chalk is the bedrock at all five sample points on the BGS geology map, and Chorleywood Gravel Member sand and gravel lies over it at four. Gravel drains well, while chalk can be affected by dissolution where water collects, so drainage and soakaways form part of the inspection.
Could flooding affect a house in either conservation area?
None of either area is in Flood Zone 2 or 3 on the Environment Agency's Flood Map for Planning. Because that map covers rivers and the sea only, surface water still needs a separate look on the long-term flood risk tool for the specific address.
Which building is Grade II* here?
Christchurch is the single Grade II* building among 18 list entries found inside the two conservation areas, with the remaining 17 at Grade II and nothing at Grade I. Owners of unlisted houses still need to check conservation-area rules before external alterations.
How old are most homes in the surrounding LSOAs?
Mostly post-war. For LSOAs E01023817 and E01023814, the VOA's 2025 tables give 27.3% of dwellings from 1945-1972 and 28.1% from 1973-1999, against 13.2% before 1900. Flats, at 33.9%, and detached houses, at 31.4%, are the two largest types.
What helps when arranging an inspection of a house beside the Common?
The address and title plan, any drawings or consents for extensions and outbuildings, and notes on tree work or drainage repairs. Mention any changes of level or retaining walls in the garden, and say whether the house is inside either conservation area, so the visit can be planned around what matters.
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