What you could build at TW12 2DP: the planning rules at this address, what neighbours have built and how big, planning decisions nearby, rough costs and the value an extension adds, and how to get started. In Hampton Village, Richmond upon Thames.
95extensions seen within 600 m in the last 10 years
6loft conversions within 600 m in the last 10 years
115.9extensions per 1,000 homes in the neighbourhood (10 years)
● work seen on energy certificates · ● application approved · ● refused · ● pending or other · ● this postcode
The rules at this address
Houses usually have permitted development rights: some rear extensions (typically up to 3 m deep for a semi or terrace, 4 m detached), loft conversions within volume limits, and porches can go ahead without planning permission. Larger single-storey rear extensions (up to 6 m / 8 m) can use the “prior approval” neighbour scheme.
In the Hampton Village conservation area: permitted development is narrower (for example no side extensions or roof cladding), and demolition and works to trees need consent.
No Article 4 direction recorded for this postcode.
Listed buildings need listed building consent for most changes, inside and out: check the National Heritage List.
To be certain work is permitted development, apply for a lawful development certificate (about £129 for householders in England). Building regulations apply either way.
Across England and Wales, homes extended by a typical 30 m² and then resold rose about 11.1% more than similar homes nearby over the same years (124,884 resales). How extensions pay off by size, type and region.
Single-storey rear or side extension: about £2,000–£3,000 per m² (London £2,500–£4,000), plus fees and VAT
Loft conversion: about £45,000–£75,000 for a dormer; more for a mansard or hip-to-gable
Two-storey extension: about £1,800–£2,800 per m² of new floor
Garage conversion: about £15,000–£30,000
Basement: about £3,500–£5,000 per m², London mostly
Build costs are rough 2026 ranges from industry guides, not quotes. Get three quotes for your plans.
Move or improve?
The money you don't get back either way, for the same extra space in Hampton Village.
Move to a home 20 m² bigger (about £877,000)
Stamp duty on the new home
£33,850
Estate agent on yours 1.2% + VAT
£10,512
Solicitors, buying and selling
£3,000
Survey
£600
Removals
£1,500
Money gone
£49,462
Extend by 20 m²
Building, plus 15% for design, planning and contingency
£57,500
Less what it adds to your home's value 60% of the local price
−£88,200
Money gone
−£30,700
On these figures, extending loses about £80,162 less. Moving also changes the area, the schools and the commute; extending means months of building work and depends on planning.
Building costs vary a lot (a single-storey rear extension is often £2,000–£3,000 per m², more in London). How much space adds depends on the home and street: what extensions added to resale prices. A guide, not advice; nothing you type leaves this page.
Getting started
Look at what neighbours did. Open applications above to see drawings that were approved on similar houses, and who designed them.
Check the route: permitted development (with a lawful development certificate), prior approval for larger rear extensions, or full householder planning permission.
Get a measured survey and a designer: an architect, an architectural technologist or a designer who handles planning drawings.
Apply (householder permission is about £258 in England; councils aim to decide within 8 weeks).
Building regulations through the council's building control or an approved inspector, and party wall notices to neighbours if you build on or near the boundary.
Choose a builder: written quotes, a contract, staged payments, and check their insurance and references.
From energy certificates: an extension where a later certificate shows more floor space, a loft conversion where roof rooms appear. Certificates come with sales, lettings and some building work, so the year is when it was first seen.
Not every extension shows here. We only see building work when a new energy certificate is lodged, which happens when a home is sold, let or newly built. A loft or extension added since then won't appear, even with planning permission and building control sign-off, because those records aren't published as open data outside London. Missing work doesn't mean missing paperwork.
42, Oldfield Road, Tw12 2ae
Windows, doors or cladding
Approved
Aug 2026
PA26/1999
64, Ormond Avenue, Tw12 2rx
Rear extension
Approved
Jul 2026
PA26/1966
9, Beards Hill Close, Tw12 2ah
Side return or wrap-around
Under consideration
–
PA26/1280
4, Percy Road, Tw12 2hw
Rear extension
Under consideration
–
PA26/1450
67, 67 And 67a , High Street, Tw12 2sx
Other householder work
Under consideration
–
PA26/1431
85, Station Road, Tw12 2bj
Windows, doors or cladding
Under consideration
–
PA26/1011
3, Ormond Crescent, Tw12 2tj
Side extension
Under consideration
–
PA26/0911
38, Belgrade Road, Tw12 2az
Loft or dormer
Approved
Apr 2026
PA26/0568
67a, High Street, Tw12 2sx
Outbuilding or garden room
Approved
Mar 2026
PA26/0254
84, Ormond Avenue, Tw12 2rx
Two-storey extension
Approved
Mar 2026
PA26/0198
3, Gander Green Crescent, Tw12 2fa
Windows, doors or cladding
Other
Mar 2026
PA26/0194
46, Wensleydale Road, Tw12 2lt
Outbuilding or garden room
Under consideration
–
PA25/4176
30, Wensleydale Road, Tw12 2lw
Loft or dormer
Other
Mar 2026
PA25/4470
45, Ormond Crescent, Tw12 2tj
Other householder work
Approved
Apr 2026
PA25/4365
60, Milton Road, Tw12 2lj
Outbuilding or garden room
Other
Dec 2025
PA25/2403
5, Ormond Crescent, Tw12 2tj
Loft or dormer
Approved
Jan 2026
PA25/3098
4, Percy Road, Tw12 2hw
Rear extension
Other
Oct 2025
PA25/2940
2, Percy Road, Tw12 2hw
Other householder work
Under consideration
–
PA25/2417
48, Oldfield Road, Tw12 2ae
Loft or dormer
Approved
Sept 2025
PA25/2572
25, Wensleydale Road, Tw12 2lp
Rear extension
Approved
Oct 2025
PA25/2540
12, Station Road, Tw12 2bx
Rear extension
Approved
Jul 2025
PA25/1829
Garricks Villa, Hampton Court Road, Tw12 2ej
Rear extension
Approved
Aug 2025
PA25/0324
10, Plevna Road, Tw12 2bp
Rear extension
Approved
Jul 2025
PA25/1258
15, Johnsons Drive, Tw12 2eq
Rear extension
Approved
Jul 2025
PA25/1136
26, Belgrade Road, Tw12 2az
Rear extension
Approved
May 2025
PA25/1079
67, Ormond Crescent, Tw12 2tq
Loft or dormer
Approved
May 2025
PA25/0947
32, Ormond Crescent, Tw12 2th
Side extension
Approved
May 2025
PA25/0625
46, Ormond Avenue, Tw12 2rx
Loft or dormer
Approved
–
PA25/0811
52 Kings Paddock, Park Close, Tw12 2ef
Windows, doors or cladding
Approved
May 2025
PA25/0667
12, Plevna Road, Tw12 2bp
Windows, doors or cladding
Under consideration
–
25/0167/HOT
20, Plevna Road, Tw12 2bp
Rear extension
Under consideration
–
25/0190/HOT
South View, Upper Sunbury Road, Tw12 2dl
Loft or dormer
Under consideration
–
25/0087/PS192
55, High Street, Tw12 2sx
Rear extension
Under consideration
–
25/0036/HOT
Householder applications validated since 2023 within 600 m. The council's page has the drawings, the decision notice and who the agent or architect was. Hover a row for the description. Source: GLA Planning London Datahub.
100% (9)
–
88%
8 weeks
Basement
–
–
83%
9 weeks
Porch or front extension
60% (5)
–
81%
8 weeks
Share of decided applications approved since 2023 (number decided in brackets). Withdrawn applications aren't counted; many are withdrawn when refusal looks likely.