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FAQ

Planning, building regs, cost, process — most common questions.

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London period house exterior with architectural character — architectural drawings in London

Planning questions

Do I need planning permission for a loft conversion?Usually no — most loft conversions qualify as Permitted Development if under 40m... Do I need planning permission for a single-storey rear extension?Standard PD limits: 3m deep (attached) or 4m (detached), under 4m high. Conserva... Do I need planning permission for a side-return extension?Side returns are PD up to half the width of the original house, single-storey, h... How much does planning permission cost in London?Council fee £206 (householder 500... How long does planning permission take?8 weeks statutory determination from validation. Plus 1-2 weeks validation. Plus... What if my planning application is refused?Three options: amend and re-submit (free for 12 months), appeal to Planning Insp... What is a Lawful Development Certificate?An LDC is formal council confirmation that your proposal qualifies as Permitted ... Can I extend if my home is listed?Yes, but you need Listed Building Consent alongside planning permission. Heritag... What is Article 4?A local council direction removing specific Permitted Development rights. Most c... Can I extend in a conservation area?Yes, but with restricted PD rights. Heritage Statement required. Materials must ...

Building-Regs questions

Do I need building regulations even if I have planning?Yes. Planning and building regs are separate. PD removes the planning requiremen... How much do building regulations cost?Council LABC: £400-£900 plans + inspection for a typical extension. Approved Ins... LABC vs Approved Inspector — which?LABC is council-based, slightly cheaper, sometimes slower. Approved Inspector is... What is Part L?Part L of the Building Regulations covers thermal performance and energy efficie... What is Part B?Part B covers fire safety. Loft conversions require fire-protected escape route,...

Cost questions

How much does a loft conversion cost in London? How much does a rear extension cost in London? How much does a mansard roof cost? How much does a basement extension cost?Drawings: from £4,500. Build: £90,000-£150,000 single-storey, £220,000-£380,000 ... Council fees (£103-£206). Building regs fees (£400-£900). Structural engineer (£...

Process questions

What happens at the free site survey?We measure the property accurately, photograph existing conditions, check Articl... How quickly can you start?Site survey usually within 5 working days. Drawings to you 2-3 weeks after surve... Do I need a separate structural engineer?Almost always yes for extensions. We coordinate with a partner structural engine... Do I need a Party Wall agreement?If you're building near or against a neighbour's wall, yes. Surveyors typically ... Can you handle the whole project?Drawings + planning + building regs: yes. Build contracting: no — we recommend y...

FAQ in London — the exterior of a London house before works — The exterior of a london house before works — faq in London.

Measured survey for faq in London — every dimension recorded on site before a line of the proposal is drawn — Measured surveyEvery dimension recorded on site in a measured survey before a line of the proposal is drawn.

Planning application set for faq in London — existing, proposed and location plans on one sheet — Planning application setExisting, proposed and location plans on one sheet — as the council receives it through the Planning Portal.

An architectural technologist checking a printed set of house drawings, marking a proposed elevation in red — faq in London — Every set is checked line by line against the validation checklist before it leaves the office.

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