Loading…
These only choose where you start. Every page and every lens is still one tap away.
Sign in to keep them on every device →Loading…
What you could build at CM3 4SN: 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 Boreham & Little Baddow, Chelmsford.
● work seen on energy certificates · ● application approved · ● refused · ● pending or other · ● this postcode
| Home | Work | Seen | Space added | Floor area | Rooms | Distance |
|---|---|---|---|---|---|---|
| Woodstock, Fir Tree Lane | Extension | 2026 | +102 m² | 98 m² → 200 m² | 4 → 7 | 66 m |
| 15, Runsell Lane | Extension | 2026 | +21 m² | 135 m² → 156 m² | 5 → 4 | 581 m |
| Highfield House, The Ridge | Extension | 2025 | +44 m² | 259 m² → 303 m² | – | 139 m |
| Laurels, The Ridge | Extension | 2024 | +75 m² | 103 m² → 178 m² | – | 284 m |
| Trewannion, Fir Tree Lane | Extension | 2023 | +175 m² | 75 m² → 250 m² | 4 → 4 | 66 m |
| Terra Nova, The Ridge | Extension | 2023 | +9 m² | 208 m² → 217 m² | – | 284 m |
Planning applications outside London aren't published as open data yet, so search the council's own register: the drawings, decision and the agent are there. Find your council's planning register on GOV.UK ↗
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.
Build costs are rough 2026 ranges from industry guides, not quotes. Get three quotes for your plans.
The money you don't get back either way, for the same extra space in Boreham & Little Baddow.
| Stamp duty on the new home | £19,450 |
|---|---|
| Estate agent on yours 1.2% + VAT | £7,056 |
| Solicitors, buying and selling | £3,000 |
| Survey | £600 |
| Removals | £1,500 |
| Money gone | £31,606 |
| Building, plus 15% for design, planning and contingency | £57,500 |
|---|---|
| Less what it adds to your home's value 60% of the local price | −£59,400 |
| Money gone | −£1,900 |
On these figures, extending loses about £33,506 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.
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).
| Extension |
| 2023 |
| +63 m² |
| 221 m² → 284 m² |
| 5 → 12 |
| 291 m |
| Taransay, Fir Tree Lane | Extension | 2022 | +21 m² | 156 m² → 177 m² | 7 → 6 | 66 m |
| Mandalay, Woodside | Extension | 2022 | +87 m² | 142 m² → 229 m² | – | 347 m |
| 9, Litchborough Park | Extension | 2019 | +55 m² | 218 m² → 273 m² | 5 → 10 | 542 m |
| Tanglewood, The Ridge | Extension | 2018 | +215 m² | 167 m² → 382 m² | – | 139 m |
| Magnolia House, Common Lane | Extension | 2018 | +349 m² | 318 m² → 667 m² | – | 297 m |
| Bluebell Cottage, The Ridge | Loft conversion | 2016 | – | 146 m² → 135 m² | 5 → 5 | 284 m |
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.