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What you could build at CF37 5DA: 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 Taff's Well & Nantgarw, Rhondda Cynon Taf.
● work seen on energy certificates · ● application approved · ● refused · ● pending or other · ● this postcode
| Home | Work | Seen | Space added | Floor area | Rooms | Distance |
|---|---|---|---|---|---|---|
| 66, Elm Street | Extension | 2025 | +11 m² | 84 m² → 95 m² | 5 → 5 | 121 m |
| Cae Rhedyn | Extension | 2025 | +44 m² | 103 m² → 147 m² | – | 431 m |
| 73, Dynea Road | Extension | 2024 | +17 m² | 59 m² → 76 m² | – | 118 m |
| 3, Heol Y Bryn | Extension | 2024 | +14 m² | 199 m² → 213 m² | 9 → 7 | 360 m |
| 3, Lime Street | Extension | 2024 | +16 m² | 69 m² → 85 m² | – | 540 m |
| 14, Hawthorn Road | Extension | 2023 | +55 m² | 73 m² → 128 m² | 5 → 5 | 532 m |
| 12, Poplar Road |
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 Taff's Well & Nantgarw.
| Stamp duty on the new home (Land Transaction Tax) | £2,520 |
|---|---|
| Estate agent on yours 1.2% + VAT | £3,096 |
| Solicitors, buying and selling | £3,000 |
| Survey | £600 |
| Removals | £1,500 |
| Money gone | £10,716 |
| Building, plus 15% for design, planning and contingency | £57,500 |
|---|---|
| Less what it adds to your home's value 60% of the local price | −£31,200 |
| Money gone | £26,300 |
On these figures, moving loses about £15,584 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 |
| +67 m² |
| 74 m² → 141 m² |
| 5 → 6 |
| 541 m |
| 18, Laurel Avenue | Extension | 2023 | +15 m² | 87 m² → 102 m² | 4 → 5 | 557 m |
| 58, Hawthorn Crescent | Extension | 2022 | +16 m² | 91 m² → 107 m² | 4 → 5 | 560 m |
| Graig Llwyd | Extension | 2019 | +88 m² | 337 m² → 425 m² | – | 431 m |
| 4, Poplar Road | Extension | 2019 | +19 m² | 91 m² → 110 m² | 3 → 5 | 541 m |
| Trem-Y-Garth, Poplar Road | Extension | 2015 | +122 m² | 106 m² → 228 m² | 5 → 6 | 333 m |
| Trem-Y-Garth, Poplar Road | Loft conversion | 2015 | +122 m² | 106 m² → 228 m² | 5 → 6 | 333 m |
| 16, Hawthorn Crescent | Extension | 2015 | +24 m² | 72 m² → 96 m² | – | 453 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.