What you could build at SE15 4HY: 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 Peckham Rye, Southwark.
267extensions seen within 600 m in the last 10 years
21loft conversions within 600 m in the last 10 years
173.4extensions 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
Mostly flats at this postcode. Flats have no permitted development rights, so almost any extension or loft conversion needs planning permission, and the freeholder's consent under the lease.
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 Peckham Rye.
Move to a home 20 m² bigger (about £994,000)
Stamp duty on the new home
£43,150
Estate agent on yours 1.2% + VAT
£11,808
Solicitors, buying and selling
£3,000
Survey
£600
Removals
£1,500
Money gone
£60,058
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
−£104,400
Money gone
−£46,900
On these figures, extending loses about £106,958 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.
7, Soames Street, Se15 4bz
Side return or wrap-around
Under consideration
–
26/AP/2607
48, Keston Road, Se15 4jb
Side return or wrap-around
Approved
Oct 2026
26/AP/2499
9, Oxonian Street, Se22 8hr
Loft or dormer
Approved
Oct 2026
26/AP/2554
28, Tyrrell Road, Se22 9ne
Rear extension
Under consideration
–
26/AP/2533
17, East Dulwich Grove, Se22 8pw
Other householder work
Approved
Oct 2026
26/AP/1867
138, Oglander Road, Se15 4db
Other householder work
Under consideration
–
26/AP/2440
34, Nunhead Lane, Se15 3tu
Side extension
Refused
Oct 2026
26/AP/2425
51, Archdale Road, Se22 9hl
Loft or dormer
Approved
Sept 2026
26/AP/2341
107, Choumert Road, Se15 4ap
Rear extension
Approved
Sept 2026
26/AP/2056
25, Frogley Road, Se22 9df
Loft or dormer
Refused
Aug 2026
26/AP/1926
250, Bellenden Road, Se15 4by
Side extension
Approved
Aug 2026
26/AP/1809
8, Kinsale Road, Se15 4hl
Loft or dormer
Approved
Sept 2026
26/AP/1817
25, Relf Road, Se15 4jt
Loft or dormer
Approved
Aug 2026
26/AP/1671
61, Tyrrell Road, Se22 9ne
Side return or wrap-around
Approved
Aug 2026
26/AP/1519
11, Wingfield Street, Se15 4ln
Loft or dormer
Approved
Jul 2026
26/AP/1454
31, Muschamp Road, Se15 4eg
Loft or dormer
Approved
Jul 2026
26/AP/1389
25, East Dulwich Grove, Se22 8pw
Loft or dormer
Approved
Jul 2026
26/AP/1333
52, Maxted Road, Se15 4lf
Loft or dormer
Approved
Jun 2026
26/AP/1310
8, Marsden Road, Se15 4ee
Loft or dormer
Approved
Jul 2026
26/AP/1199
23, Kinsale Road, Se15 4hj
Loft or dormer
Approved
Jun 2026
26/AP/1134
37, Crystal Palace Road, Se22 9ex
Loft or dormer
Approved
Jun 2026
26/AP/1104
5, Marsden Road, Se15 4ee
Rear extension
Approved
May 2026
26/AP/1055
74, Crawthew Grove, Se22 9ab
Rear extension
Approved
Jun 2026
26/AP/0613
59, Ondine Road, Se15 4ea
Side return or wrap-around
Approved
May 2026
26/AP/1033
143, Peckham Rye, Se15 3ul
Loft or dormer
Withdrawn
Jun 2026
26/AP/0835
234, Rye Lane, Se15 4nl
Loft or dormer
Withdrawn
May 2026
25/AP/3685
48, Maxted Road, Se15 4lf
Loft or dormer
Approved
Jun 2026
26/AP/0914
175, Bellenden Road, Se15 4dg
Loft or dormer
Approved
May 2026
26/AP/0875
2, Frogley Road, Se22 9df
Loft or dormer
Approved
Jun 2026
26/AP/0657
26, Adys Road, Se15 4dz
Loft or dormer
Approved
Apr 2026
26/AP/0612
35, Anstey Road, Se15 4jx
Loft or dormer
Approved
Apr 2026
26/AP/0491
30, Avondale Rise, Se15 4al
Rear extension
Approved
Mar 2026
26/AP/0471
4, Danby Street, Se15 4bu
Loft or dormer
Approved
Apr 2026
26/AP/0356
60, Hayes Grove, Se22 8df
Garage conversion or garage
Approved
Mar 2026
25/AP/3668
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% (47)
88%
7 weeks
Basement
–
96% (47)
83%
8 weeks
Porch or front extension
–
100% (19)
81%
7 weeks
Share of decided applications approved since 2023 (number decided in brackets). Withdrawn applications aren't counted; many are withdrawn when refusal looks likely.