What we build in Castle Green
Most Castle Green projects we scope fall into three buckets: a side-return or rear infill that fixes a dark galley kitchen, a full-width rear extension that opens the ground floor to the garden, and a rear-plus-loft package that adds a bedroom while the scaffold is already up. Interwar Becontree estate housing, ex-LA semis with generous rear gardens.
Extension costs in Castle Green
A mid-spec 25 m² extension in Castle Green typically lands between £87,000 and £137,000 all-in — that figure includes professional fees, planning and Building Control, party wall, a 12% contingency and VAT at 20%. Ex-VAT build rates run £2625–£4000 per m² depending on glazing, structural spans and kitchen spend.
| Project | Size | Castle Green all-in |
|---|---|---|
| Side return infill | 15–20 m² | £65k – £103k |
| Full-width rear | 20–30 m² | £87k – £137k |
| Wraparound | 30–45 m² | £126k – £199k |
| Double-storey rear | 40–60 m² | £170k – £267k |
Planning permission in Castle Green
Permissive borough — most extensions proceed via PD or prior approval. Watch out for Beam Park and heritage estate constraints in central Barking.
Before you assume permitted development applies to your street, check whether your street falls inside a conservation area or an Article 4 direction — both are common in Barking & Dagenham and both remove PD rights for rear and side extensions. Our London planning guide walks through the tests in order.
Party wall and neighbours
Semi-detached — one party wall neighbour typical.
Serve notice at least two months before you break ground. Budget £1,200–£2,400 per adjoining owner if they dissent and appoint their own surveyor — see the Party Wall Act guide.
Access, logistics and site set-up
Narrow roads limit lorry size, so materials arrive in smaller loads; a good programme allows for it.
Every quote we issue for Castle Green prices skip permits, parking suspensions, protection and welfare explicitly in the preliminaries — so the number you sign is the number you pay.
Value added in Castle Green
Light and layout move value here more than raw square metres — spend on glazing and ceiling height.
Typical programme
- Weeks 0–4Measured survey, design and structural calcs
- Weeks 4–12Planning or lawful development certificate, party wall notices
- Weeks 12–16Tender, builder selection and contract signing
- Weeks 16–34On site: groundworks, shell, watertight, first and second fix
- Week 35Building Control sign-off, snagging and handover
Full detail in the London extension timeline guide.
Why homeowners in Castle Green use us
- KYB-verified builders only
- Live Barking & Dagenham project experience
- Itemised fixed-price specifications
- Insurance, warranty and accreditation checks