Three boundaries joined into one
The study area joins three conservation areas in the London Borough of Richmond upon Thames: Petersham at about 86.9 hectares, Ham Common at 74.9 and Ham House at 63.4. Richmond's statements describe a village core of 17th and 18th-century mansions, a green fringed by buildings of varied scale, and a 17th-century country house estate on the south bank of the river.
A local policy layer sits on top of the borough's: the referendum version of the Ham and Petersham Neighbourhood Plan, which states that its policies will be used in deciding planning applications in its area. The 1950s Parkleys estate beside Ham Common is described for context but not counted, and the wider riverside is covered by the south-west London guide.
Records for Petersham, Ham House and Ham Common
Every statement below links to the public record it comes from; sources were re-checked on .
National dates and council dates
On planning.data.gov.uk the Petersham and Ham House records, references 7351 and 7368, share a record start date of 7 September 1982, while Ham Common, reference 7352, has one of 13 January 2004.
Richmond's own statements treat those as extension dates: Petersham and Ham Common were first designated in 1969 and Ham House in 1975, each enlarged since.
Because the lines have moved more than once, a house near an edge is checked against the current mapped boundary rather than against the year a neighbour came under control.
Mansions, cottages and the green
Petersham Road north is lined, in Richmond's Petersham statement, with 17th and 18th-century mansions of two or three storeys behind high brick walls and ironwork railings and gates, while its southern stretch sets large houses on the east side against closely packed cottages on the west.
Around the green the Ham Common statement records everything from modest terraced cottages to 18th-century mansions in their own grounds, and close-set cottages behind low walls and hedges on Lock Road and New Road.
Ham Street, in the Ham House statement, mixes listed 18th-century mansions behind high walls with almshouses and terraced cottages, among them the Victorian Wiggins and Pointer Cottages set at right angles to the street.
Listed gates, concrete flats and Ham House
The national list layer places 85 entries inside the three boundaries: 69 at Grade II, 14 at Grade II* and two at Grade I, Ham House and Richmond Golf Club, Sudbrook Park.
The Ham House estate is also a Grade II* registered park and garden overlapping about 18.14 hectares of the study area, and Richmond's statement dates the house to 1610, built for Sir Thomas Vavasour.
One Grade II* entry is a boundary feature rather than a house, the garden gates and railings of Petersham House, and others list a house together with its boundary, such as Rutland Lodge with its entrance gate and piers, so mending a pier or a run of railings can itself be a listed building consent matter.
Three more are the flats of Langham House Close, 1-18, 19-24 and 25-30, which the neighbourhood plan describes as concrete-framed flats of two and three storeys by Stirling and Gowan, an early example of New Brutalism.
River gravels and Thames flooding
At four of five sample points the BGS superficial layer at 1:50,000 maps Kempton Park Gravel Member sand and gravel, and at the fifth alluvium of clay, silt, sand and peat, all resting on London Clay Formation.
Richmond's Ham House statement calls the estate's relationship with the river an intimate one, with floodwater a reminder of the natural landscape, and the neighbourhood plan notes that the Thames towpath is affected by tidal flooding and impassable at high tide.
On the Environment Agency's Flood Map for Planning, 22.4% of the study area lies in Flood Zone 3 and 11.5% in Flood Zone 2; within Zone 3 the source is river and sea across 19.4% of the study area and the sea alone across 3.0%, while rivers alone account for 7.6% within Zone 2.
The same statement describes a large 1960s estate of houses and flats built on former river meadows just west of Ham Street, where the address is also put through the long-term flood risk service, which covers surface water, before a ground-floor room is relied on.
Directions and the neighbourhood plan
The national Article 4 dataset has no polygon over the three areas, but Richmond's conservation-area direction register lists directions for Petersham under CA6, for Ham Gate Avenue and Ham Street under CA7, and for Ham Street and Wiggins Lane under CA23.
At an address covered by one, the council's page explains, the householder must apply for permission for work that would otherwise be permitted, from new windows and doors to painting brickwork or taking down a chimney.
The Ham and Petersham Neighbourhood Plan 2018-2033, in its September 2018 referendum version, asks every application for a new building to show how it answers the character of its conservation area or neighbourhood character area, and does not accept gated developments.
Parkleys, the Span development just south of Ham Common, has been a conservation area of its own since 2003, and Richmond's Parkleys Estate statement describes its Grade II-listed flats as built of brick with concrete slab floors, flat roofs and concrete tile-hanging.
A single statistical area
Only one LSOA, E01003817, has a quarter or more of its area inside the three boundaries, so the VOA's 2025 Council Tax stock release describes about 960 dwellings in that one area, counted to the nearest 10.
Its commonest build period in the VOA age table is 1945-1972, at 44.8%, ahead of 17.7% from 2000 onwards and 15.6% from 1919-1939, with 8.3% before 1900.
Flats and maisonettes account for 51.0% in the type table, terraced houses 22.9% and detached houses 13.5%, and band D is the commonest band at 37.5%.
One statistical area cannot stand for three conservation areas of such different ages, so the VOA figures describe the surrounding stock rather than a mansion on Petersham Road or a cottage on the green.
No rail or Underground station lies within 750 metres of the three boundaries in the NaPTAN dataset.
Local guides and practice services
The first list gathers the local guides written for one kind of instruction each in TW10, and the second links the matching service page for the practice as a whole.
Neighbouring guides
Wider coverage sits in the south-west London hub. Richmond, Kingston, Twickenham, East Sheen and Teddington each have a guide of their own, St Margarets is covered across the river, and Raynes Park elsewhere in south-west London.
Owners' questions on the three conservation areas
Why do national records date these areas to 1982 and 2004?
A planning.data.gov.uk record start date can follow a later boundary change. Richmond's statements give first designation as 1969 for Petersham and Ham Common and 1975 for Ham House, with 7 September 1982 appearing among the extension dates.
Can the gates and railings of a house be listed separately?
Yes. The garden gates and railings of Petersham House form a Grade II* entry of their own, and Rutland Lodge is listed with its entrance gate and piers, so work to walls, piers or ironwork is checked against the entry first.
Is Ham House inside the study area?
It is. Ham House is one of two Grade I entries inside the three boundaries, and its estate, a Grade II* registered park and garden, overlaps about 18.14 hectares of the study area.
How much of the study area lies in a flood zone?
The planning flood map puts 22.4% in Flood Zone 3 and 11.5% in Flood Zone 2, and the neighbourhood plan records that the towpath floods at high tide. Zones do not judge single houses, so each address is checked on its own.
What does the neighbourhood plan ask of a new building?
It asks the application to show how the design addresses the character of its conservation area or neighbourhood character area, keeps paths and through routes where practical, and rules out gated developments. Richmond's Local Plan policies apply alongside it.
What helps before buying a flat in Langham House Close?
The lease, recent service charge accounts, the managing agent's repair history and any listed building consents for windows, balconies or concrete repairs. All three blocks are Grade II*, so work to them is a consent matter as well as a maintenance one.
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