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Improving at CR8 4DX

What you could build at CR8 4DX: 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 Coulsdon, Croydon.

50extensions seen within 600 m in the last 10 years

4loft conversions within 600 m in the last 10 years

82%of 50 householder applications nearby approved (since 2023)

58extensions 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.

What neighbours have built

Home	Work	Seen	Space added	Floor area	Rooms	Distance
68, Reedham Drive	Extension	2026	+37 m²	81 m² → 118 m²	–	181 m
46, Old Lodge Lane	Extension	2026	+40 m²	159 m² → 199 m²	7 → 8	251 m
38, Graham Road	Extension	2026	+21 m²	183 m² → 204 m²	7 → 8	301 m
154, Brighton Road	Extension	2026	+34 m²	117 m² → 151 m²	–	333 m
66, Brighton Road	Extension	2026	+15 m²	62 m² → 77 m²	–	526 m
11, Woodcrest Road	Extension	2026	+10 m²	122 m² → 132 m²	5 → 5	594 m

Planning applications nearby

Address	Work	Outcome	Decided	Drawings and agent
99, Downlands Road, Cr8 4jj	Loft or dormer	Under consideration	–	26/02472/HSE
32, Purley Rise, Cr8 3bp	Other householder work	Approved	Oct 2026	26/02070/HSE
6, Sydney Avenue, Cr8 4ja	Two-storey extension	Approved	May 2026	26/01034/HSE
15, Woodland Way, Cr8 2ht	Side extension	Under consideration	–	26/00910/HSE
185, Brighton Road, Cr8 4hf	Loft or dormer	Approved	May 2026	26/00806/HSE
4, Old Lodge Lane, Cr8 4de	Loft or dormer	Refused	May 2026	26/00821/HSE
13, Woodland Way, Cr8 2ht	Porch or front extension	Approved	Apr 2026

How often householder applications are approved

Work	Coulsdon	Croydon	London	Typical decision time
All householder applications	81% (132)	82% (3854)	80%	8 weeks
Loft or dormer	68% (34)	73% (712)	81%	8 weeks
Rear extension	97% (37)	88% (1580)	79%	7 weeks
Two-storey extension	71% (21)	79% (621)	72%	8 weeks
Other householder work	60% (10)	59% (263)	70%	8 weeks
Side return or wrap-around	–	89% (138)	88%	8 weeks
Windows, doors or cladding	–	82% (45)	90%	8 weeks
Outbuilding or garden room	–	84% (111)	79%	8 weeks
Side extension	100% (8)	94% (140)	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 Coulsdon.

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 £610,000)

Stamp duty on the new home	£20,500
Estate agent on yours 1.2% + VAT	£7,344
Solicitors, buying and selling	£3,000
Survey	£600
Removals	£1,500
Money gone	£32,944

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	−£60,000
Money gone	−£2,500

On these figures, extending loses about £35,444 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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Improving at CR8 4DX

The rules at this address

What neighbours have built

Planning applications nearby

How often householder applications are approved

Cost and the value it adds

Move or improve?

Getting started

Go deeper

Improving at CR8 4DX

CR8 4DX is on Aveling Close

The rules at this address

What neighbours have built

Planning applications nearby

How often householder applications are approved

Cost and the value it adds

Move or improve?

Getting started

Go deeper

CR8 4DX is on Aveling Close