What you could build at SE27 0HS: 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 West Norwood East, Lambeth.
138extensions seen within 600 m in the last 10 years
20loft conversions within 600 m in the last 10 years
105.6extensions 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.
83 85 And 87 Norwood High Street, Development Control Pseudo Street, Se27 9js
Other householder work
Withdrawn
Sept 2026
26/02335/P3MA
39, Selsdon Road, Se27 0pq
Loft or dormer
Approved
Aug 2026
26/01820/LDCP
7, Selsdon Road, Se27 0pq
Rear extension
Refused
Jul 2026
26/01595/PDE
39, Selsdon Road, Se27 0pq
Loft or dormer
Refused
May 2026
26/00961/FUL
53, 53 And 53a, Idmiston Road, Se27 9hl
Loft or dormer
Approved
May 2026
26/00748/FUL
How often householder applications are approved
Work
West Norwood East
Lambeth
London
Typical decision time
All householder applications
84% (56)
78% (1125)
80%
8 weeks
Loft or dormer
89% (36)
89% (593)
81%
8 weeks
Rear extension
56% (9)
65% (231)
79%
7 weeks
Two-storey extension
–
80% (10)
72%
8 weeks
Other householder work
–
59% (127)
70%
8 weeks
Side return or wrap-around
–
60% (45)
88%
8 weeks
Windows, doors or cladding
–
86% (28)
90%
8 weeks
Outbuilding or garden room
–
77% (44)
79%
8 weeks
Side extension
–
76% (21)
86%
8 weeks
Garage conversion or garage
Cost and the value it adds
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 West Norwood East.
Move to a home 20 m² bigger (about £759,000)
Stamp duty on the new home
£27,950
Estate agent on yours 1.2% + VAT
£8,856
Solicitors, buying and selling
£3,000
Survey
£600
Removals
£1,500
Money gone
£41,906
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
−£86,400
Money gone
−£28,900
On these figures, extending loses about £70,806 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.
91 St Julian'S Farm Road London Lambeth Se27 0rj, Se27 0rj
Loft or dormer
Approved
Feb 2025
24/04039/LDCP
10, The Pavement, Chapel Road, Se27 0un
Other householder work
Approved
–
24/03550/P3MA
6 Hubbard Road London Lambeth Se27 9pj, Se27 9pj
Loft or dormer
Approved
Dec 2024
24/03352/LDCP
4 Roxburgh Road London Lambeth Se27 0ld, Se27 0ld
Loft or dormer
Refused
Nov 2024
24/02869/LDCP
Rear Of 56, Norwood High Street, Se27 9nr
Other householder work
Under consideration
–
24/02151/P3MA
7, Hainthorpe Road, Se27 0pl
Loft or dormer
Approved
Aug 2024
24/01796/LDCP
78, Canterbury Grove, Se27 0pa
Loft or dormer
Approved
May 2024
24/01060/LDCP
1a, Curnick'S Lane, Se27 0ut
Other householder work
Refused
Jun 2024
24/00729/P3MA
1a Curnick'S Lane London Lambeth Se27 0ut, Se27 0ut
Other householder work
Refused
Jun 2024
24/00730/P3MA
44, Robson Road, Se27 9lb
Loft or dormer
Approved
Feb 2024
24/00329/LDCP
78 Auckland Hill London Lambeth Se27 9qq, Se27 9qq
Rear extension
Not needed / lawful
Feb 2024
24/00244/PDE
14, Canterbury Grove, Se27 0nt
Rear extension
Approved
Feb 2024
24/00165/PDE
41 Elder Road London Lambeth Se27 9ly, Se27 9ly
Rear extension
Approved
Nov 2023
23/03544/LDCP
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% (16)
88%
8 weeks
Basement
–
50% (8)
83%
15 weeks
Porch or front extension
–
–
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.