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What you could build at LL29 9HR: 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 Old Colwyn & Llanddulas, Conwy.
● work seen on energy certificates · ● application approved · ● refused · ● pending or other · ● this postcode
| Home | Work | Seen | Space added | Floor area | Rooms | Distance |
|---|---|---|---|---|---|---|
| 514, Abergele Road | Extension | 2026 | +29 m² | 167 m² → 196 m² | – | 172 m |
| 27, St Davids Road | Extension | 2026 | +10 m² | 63 m² → 73 m² | 3 → 3 | 502 m |
| 132, Llysfaen Road | Extension | 2025 | +16 m² | 89 m² → 105 m² | 5 → 5 | 123 m |
| 31, Highlands Road | Extension | 2025 | +29 m² | 79 m² → 108 m² | – | 189 m |
| 25, Highlands Road | Extension | 2025 | +14 m² | 86 m² → 100 m² | 5 → 5 | 189 m |
| 6, Churchill Close | Extension | 2025 | +29 m² | 84 m² → 113 m² | – | 493 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 Old Colwyn & Llanddulas.
| Stamp duty on the new home (Land Transaction Tax) | £1,020 |
|---|---|
| Estate agent on yours 1.2% + VAT | £2,808 |
| Solicitors, buying and selling | £3,000 |
| Survey | £600 |
| Removals | £1,500 |
| Money gone | £8,928 |
| Building, plus 15% for design, planning and contingency | £57,500 |
|---|---|
| Less what it adds to your home's value 60% of the local price | −£28,200 |
| Money gone | £29,300 |
On these figures, moving loses about £20,372 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 |
| +30 m² |
| 44 m² → 74 m² |
| – |
| 327 m |
| 8, Parc Bryn Awelon | Extension | 2022 | +33 m² | 48 m² → 81 m² | – | 230 m |
| Taklakot, Craig Road | Extension | 2022 | +39 m² | 128 m² → 167 m² | – | 408 m |
| 35, Llysfaen Road | Extension | 2021 | +35 m² | 149 m² → 184 m² | 6 → 8 | 514 m |
| 135, Peulwys Lane | Extension | 2021 | +31 m² | 185 m² → 216 m² | – | 578 m |
| 20, Penmaen Bod Eilias | Extension | 2018 | +34 m² | 94 m² → 128 m² | – | 291 m |
| 18, Tan Y Lan Road | Loft conversion | 2017 | – | 92 m² → 87 m² | 5 → 5 | 519 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.