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London — Tier-1 Pillar

London Renovation — Planning, Building Control, Party Wall, VAT

London renovation reality. Parallel planning + Building Control consents, Party Wall etc. Act 1996 notices, NHBC warranty, Gas Safe, Part P electrics, VAT at 20% (5% energy-saving), leasehold freeholder consent. £60K-£350K typical. One vetted London builder.

~2 min read·Updated 2026-04-23

A London renovation is not a provincial renovation with a bigger price tag. London sits at the intersection of two parallel consent regimes: planning permission (your borough council, land-use and amenity) and Building Control (private approved inspector or local authority, technical compliance with Building Regulations 2010). Miss either one and the work is unlawful even if the other has been granted. Then layer on the Party Wall etc. Act 1996, Listed Building Consent where applicable, conservation-area Article 4 Directions, leasehold freeholder consent on 70% of London flats, and VAT classification (20% standard, 5% for energy-saving work and properties empty >2 years, zero-rated for new-build) — and the permit trail is frequently longer than the build trail.

AskBaily routes your London renovation to one vetted NHBC-registered builder who has filed Building Control notices, served Party Wall notices, and drafted Listed Building Consent applications for a living. Not a dozen strangers from an online marketplace who will ring your mobile for three weeks.

What a real London renovation involves

  1. Planning. Full planning application, Prior Approval for extensions under Permitted Development, or Lawful Development Certificate for retrospective sign-off. 8-13 weeks for a householder application.
  2. Building Control. Full Plans submission (major works) or Building Notice (minor). Private approved inspector or local authority — both are valid. Covers Approved Documents A (structure) through Q (security).
  3. Party Wall. 2-month written notice to adjoining owners under Sections 1, 2, or 6.
  4. Specialist trades. Gas Safe registered engineer for any gas work. Part P competent-person (NICEIC/NAPIT/Stroma/ELECSA) for notifiable electrics.
  5. Leasehold consent. Licence to Alter + deed of variation for most significant flat renovations.
  6. VAT. Standard 20%, 5% reduced rate for energy-saving installations or empty-property conversion, zero-rated for new-build.

Frequently asked questions

Do I always need planning permission to renovate a London property? No. Many alterations fall under Permitted Development rights (GPDO 2015 as amended) — but in a conservation area with an Article 4 Direction, those rights are withdrawn and full planning is required. Building Control is always needed for notifiable work.

How much does a London renovation cost per square metre? Mid-spec full refurbishment runs £1,800-£3,200 per sq m in most boroughs. Prime central (Mayfair, Knightsbridge, Chelsea, Kensington) runs £3,500-£6,500 per sq m. Basement conversions run higher due to underpinning costs.

What VAT rate applies to London renovation work? 20% standard rate on most work. 5% reduced rate for certain energy-saving installations and for properties empty for 2+ years. Zero rate for new-build. Misclassification is an HMRC audit exposure.

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Each neighborhood has distinct Article 4 Direction + conservation posture. Baily pre-scopes against the specific overlay your home sits under.

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Origin

Who is Baily?

Baily is named after Francis Baily — an English stockbroker who retired at 51, became an astronomer, and in 1836 described something on the edge of a solar eclipse that nobody had properly articulated before: a string of bright beads of sunlight breaking through the valleys along the moon’s rim.

He wasn’t the first to see them. Edmond Halley saw them in 1715 and barely noticed. Baily’s contribution was clarity — describing exactly what was happening, in plain language, so vividly that the whole field of astronomy paid attention. The phenomenon is still called Baily’s beads.

That’s what we wanted our AI to do. Every inbound call and text has signal in it — a homeowner’s real question, a timeline, a budget, a hesitation that means “yes but.” Baily listens to every one, 24/7, and finds the beads of light.

Baily was a businessman before he was a scientist. That’s our vibe too.

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