Improving at SE1 4RP

What you could build at SE1 4RP: 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 London Bridge & Bermondsey West, Southwark.

152extensions seen within 600 m in the last 10 years

6loft conversions within 600 m in the last 10 years

79%of 33 householder applications nearby approved (since 2023)

65.1extensions 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).
Article 4 direction (Old Kent Road North District Town Centre): some rights normally allowed have been removed here. Check what it covers with the council before relying on permitted development.
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.

What neighbours have built

Home	Work	Seen	Space added	Floor area	Rooms	Distance
Flat 4, 1, Woods Place	Extension	2026	+25 m²	150 m² → 175 m²	–	90 m
Flat 18, Gutenberg Court, 177, Grange Road	Extension	2026	+45 m²	65 m² → 110 m²	–	245 m
52, Grange Road	Extension	2026	+44 m²	130 m² → 174 m²	–	262 m
Unit 3, Futura House, 169, Grange Road	Extension	2026	+34 m²	62 m² → 96 m²	–	273 m
Flat 719 Building 700, Alaska Buildings, 61, Grange Road	Extension	2026	+30 m²	101 m² → 131 m²	–	322 m
Flat 54, 239, Long Lane	Extension	2026	+46 m²	67 m² → 113 m²	–	324 m

Planning applications nearby

Address	Work	Outcome	Decided	Drawings and agent
67, Henshaw Street, Se17 1pe	Two-storey extension	Under consideration	–	26/AP/2847
69, Henshaw Street, Se17 1pe	Two-storey extension	Under consideration	–	26/AP/2848
190, Grange Road, Se1 3aa	Windows, doors or cladding	Approved	Aug 2026	26/AP/2061
43, Tanner Street, Se1 3pl	Other householder work	Approved	Jul 2026	26/AP/1196
2, Old Kent Road, Se1 4az	Two-storey extension	Refused	Jul 2026	26/AP/0730
29, Searles Road, Se1 4yx	Windows, doors or cladding	Approved	Apr 2026	25/AP/2995

How often householder applications are approved

Work	London Bridge & Bermondsey West	Southwark	London	Typical decision time
All householder applications	83% (12)	92% (2175)	80%	7 weeks
Loft or dormer	100% (5)	94% (980)	81%	7 weeks
Rear extension	–	92% (365)	79%	7 weeks
Two-storey extension	–	83% (83)	72%	8 weeks
Other householder work	–	80% (171)	70%	7 weeks
Side return or wrap-around	–	98% (208)	88%	7 weeks
Windows, doors or cladding	–	90% (110)	90%	7 weeks
Outbuilding or garden room	–	82% (77)	79%	7 weeks
Side extension	–	99% (68)	86%	7 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 London Bridge & Bermondsey West.

Your home is worthExtra space you need (m²)Homes here sell for, per m²Building cost per m²Share of that an extension adds (%)

Move to a home 20 m² bigger (about £598,000)

Stamp duty on the new home	£19,900
Estate agent on yours 1.2% + VAT	£6,480
Solicitors, buying and selling	£3,000
Survey	£600
Removals	£1,500
Money gone	£31,480

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	−£88,800
Money gone	−£31,300

On these figures, extending loses about £62,780 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.

Find help: RIBA Find an Architect ↗ · CIAT architectural technologists ↗ · TrustMark tradespeople ↗ · Federation of Master Builders ↗ · Planning Portal guides ↗

General guidance, not planning or legal advice. Fees and rules as checked in October 2026; confirm with the council.

Energy certificates: MHCLG (OGL). Planning applications: GLA Planning London Datahub. Conservation areas and Article 4: planning.data.gov.uk (OGL).

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