LELondonExtensions.uk
St Paul's, London
Areas · City of London · Central London
St Paul's · EC1 · EC2 · EC3

House extensions in St Paul's

St Paul's sits in City of London, where the streets are dominated by 1930s suburban semis where a rear-and-side wraparound is the obvious move. The build that pays back most reliably here is a rear extension paired with a loft dormer, done under one scaffold and one contract.

Typical all-in (inc VAT)
£114k–£184k
Build rate per m²
£3175–£4825
On-site programme
12–20 weeks
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What we build in St Paul's

Most St Paul's 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. Mostly apartments and lofts within listed buildings; very few extendable houses.

Loft conversionsInternal reconfigurations

Extension costs in St Paul's

A mid-spec 25 m² extension in St Paul's typically lands between £114,000 and £184,000 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 £3175–£4825 per m² depending on glazing, structural spans and kitchen spend.

ProjectSizeSt Paul's all-in
Side return infill15–20 m²£86k – £138k
Full-width rear20–30 m²£114k – £184k
Wraparound30–45 m²£165k – £267k
Double-storey rear40–60 m²£222k – £359k

Planning permission in St Paul's

Almost entirely conservation area. Householder extensions are rare; internal alterations and loft conversions dominate and often need listed building consent.

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 City of London and both remove PD rights for rear and side extensions. Our London planning guide walks through the tests in order.

Party wall and neighbours

Vertical Party Wall notices to flats above and below are standard for internal work.

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

Access is typically through the house, so expect dust protection, a boarded route and a skip permit from the council.

Every quote we issue for St Paul's 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 St Paul's

Well-executed extensions here tend to return a healthy share of their cost at resale, particularly where they add a genuine third or fourth bedroom.

Typical programme

  1. Weeks 0–4Measured survey, design and structural calcs
  2. Weeks 4–12Planning or lawful development certificate, party wall notices
  3. Weeks 12–16Tender, builder selection and contract signing
  4. Weeks 16–34On site: groundworks, shell, watertight, first and second fix
  5. Week 35Building Control sign-off, snagging and handover

Full detail in the London extension timeline guide.

Why homeowners in St Paul's use us

  • KYB-verified builders only
  • Live City of London project experience
  • Itemised fixed-price specifications
  • Insurance, warranty and accreditation checks
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