What you could build at TW2 5AR: 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 Twickenham West, Richmond upon Thames.
138extensions seen within 600 m in the last 10 years
7loft conversions within 600 m in the last 10 years
122.7extensions 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.
Not in a conservation area (from council registers).
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 Twickenham West.
Move to a home 20 m² bigger (about £822,000)
Stamp duty on the new home
£31,100
Estate agent on yours 1.2% + VAT
£9,648
Solicitors, buying and selling
£3,000
Survey
£600
Removals
£1,500
Money gone
£45,848
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
−£91,200
Money gone
−£33,700
On these figures, extending loses about £79,548 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.
Sept 2026
PA26/2506
308, Staines Road, Tw2 5as
Loft or dormer
Approved
Sept 2026
PA26/2653
56, Hospital Bridge Road, Tw2 5uj
Loft or dormer
Approved
Sept 2026
PA26/2247
136, Fulwell Park Avenue, Tw2 5hb
Rear extension
Approved
Aug 2026
PA26/2329
17, Fielding Avenue, Tw2 5lx
Other householder work
Approved
Aug 2026
PA26/2115
44, Fourth Cross Road, Tw2 5el
Loft or dormer
Approved
Jul 2026
PA26/1947
34, Campbell Road, Tw2 5by
Outbuilding or garden room
Other
Sept 2026
PA26/1877
134, Sixth Cross Road, Tw2 5pe
Rear extension
Under consideration
–
PA26/1615
263, Staines Road, Tw2 5ay
Rear extension
Under consideration
–
PA26/1519
56, Hospital Bridge Road, Tw2 5uj
Rear extension
Under consideration
–
PA26/1545
296, Staines Road, Tw2 5as
Two-storey extension
Under consideration
–
PA26/1064
169, Lincoln Avenue, Tw2 6nj
Rear extension
Under consideration
–
PA26/1403
49, Selkirk Road, Tw2 6ps
Windows, doors or cladding
Under consideration
–
PA26/1209
207, Lincoln Avenue, Tw2 6nl
Rear extension
Approved
May 2026
PA26/1154
34, Fulwell Park Avenue, Tw2 5hq
Two-storey extension
Other
–
PA26/1001
38, Campbell Road, Tw2 5by
Rear extension
Under consideration
–
PA26/0907
263, Staines Road, Tw2 5ay
Rear extension
Other
Apr 2026
PA26/0986
72, Fortescue Avenue, Tw2 5lu
Side extension
Under consideration
–
PA26/0909
143, Staines Road, Tw2 5bd
Loft or dormer
Approved
Apr 2026
PA26/0955
5, Turner Avenue, Tw2 5lt
Other householder work
Approved
Apr 2026
PA26/0712
79, Lisbon Avenue, Tw2 5hl
Rear extension
Approved
Apr 2026
PA26/0558
25, Lincoln Avenue, Tw2 6nh
Rear extension
Approved
–
PA26/0300
25, Lincoln Avenue, Tw2 6nh
Loft or dormer
Approved
–
PA26/0301
34, Campbell Road, Tw2 5by
Garage conversion or garage
Other
Mar 2026
PA25/2987
1a, Fielding Avenue, Tw2 5lx
Two-storey extension
Approved
Mar 2026
PA26/0004
29, Campbell Road, Tw2 5by
Rear extension
Approved
Mar 2026
PA26/0213
116, Hampton Road, Tw2 5qs
Loft or dormer
Approved
Feb 2026
PA26/0127
72, Fortescue Avenue, Tw2 5lu
Rear extension
Other
Feb 2026
PA25/4316
3, Clarendon Crescent, Tw2 5ln
Loft or dormer
Approved
Jan 2026
PA25/4315
255, Staines Road, Tw2 5ay
Rear extension
Approved
Jan 2026
PA25/3621
13, Wiltshire Gardens, Tw2 6nd
Rear extension
Approved
Feb 2026
PA25/4134
72, Fourth Cross Road, Tw2 5ep
Loft or dormer
Other
Jan 2026
PA25/3188
316, Staines Road, Tw2 5as
Outbuilding or garden room
Approved
Dec 2025
PA25/3370
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.
–
88%
8 weeks
Basement
–
–
83%
9 weeks
Porch or front extension
83% (6)
–
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.