Improving at MK17 8FQ

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 (Article 4 Direction relating to Houses in Multiple Occupation (HIMO) - Non immediate direction): 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

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.

Planning applications nearby

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 ↗

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.

Getting started

1. Look at what neighbours did. Open applications above to see drawings that were approved on similar houses, and who designed them.
2. Check the route: permitted development (with a lawful development certificate), prior approval for larger rear extensions, or full householder planning permission.
3. Get a measured survey and a designer: an architect, an architectural technologist or a designer who handles planning drawings.
4. Apply (householder permission is about £258 in England; councils aim to decide within 8 weeks).
5. 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.
6. 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.

MK17 8FQ is on Ambridge Lane

Improving on all of Ambridge Lane →