Skip to content
London — Tier-1 Pillar

London Leasehold Flat Renovation — Licence to Alter, Deed of Variation, Freeholder Consent

London leasehold flat renovation. Licence to Alter, deed of variation, freeholder consent fees, head-lease covenants, managing agent approval, Party Wall on shared structures. £30K-£200K typical.

~2 min read·Updated 2026-04-23

The Licence to Alter is the instrument that keeps your renovation legal. Roughly 70% of London flats are leasehold, and almost every long lease has an absolute or qualified covenant against structural alterations — which, in freeholder-solicitor interpretation, covers a great deal of routine renovation work. Remove a non-load-bearing wall without consent? Breach. Relocate the soil-pipe run? Breach. Upgrade the consumer unit without telling the managing agent? Breach. Sell the flat with an unconsented alteration and the freeholder will demand retrospective consent — at a price.

The Licence to Alter documents consent, conditions (insurance, working hours, asbestos survey, reinstatement on lease expiry), freeholder's solicitor fees, and surveyor's fees. Budget £750-£4,000 in consent costs alone before a trowel is lifted, plus 6-14 weeks of solicitor back-and-forth on a typical central-London mansion-block flat.

AskBaily routes leasehold flat renovations to a builder who works with the freeholder's surveyor, provides the insurance certificates and method statements the managing agent requires, and has closed Party Wall awards in shared structures.

Leasehold renovation consent chain

  1. Read the lease. Identify absolute vs qualified covenants. Qualified ("consent not to be unreasonably withheld") is manageable. Absolute is not — you need a deed of variation.
  2. Pre-application with freeholder. Scope, drawings, method statement.
  3. Licence to Alter. Solicitor-drafted. Conditions (insurance, working hours, asbestos, reinstatement). Fees typically £750-£4,000.
  4. Deed of variation (if needed). Amends the lease to allow the alteration. Lender consent usually required.
  5. Managing agent approval. Separate from freeholder — approves method, working hours, lift use, waste disposal.
  6. Building Control + Party Wall. Parallel processes.

Frequently asked questions

What does a Licence to Alter cost? £750-£4,000 in combined freeholder's solicitor and surveyor fees for a typical Inner London flat renovation. Prime-central mansion blocks run higher — £3,000-£10,000 is not unusual for a full gut.

How long does a Licence to Alter take? 6-14 weeks from first pre-application to signed licence. Major alterations requiring a deed of variation take 16-26 weeks.

What happens if I renovate without a Licence to Alter? Breach of the lease. On sale, the buyer's solicitor will demand retrospective consent — which the freeholder can price at whatever the market will bear. In extreme cases, forfeiture proceedings.

<!-- STUB: content-sprint agent should expand to 1,200-word pillar. Add sections on: absolute vs qualified covenants, deed of variation mechanics, lender consent, typical mansion block fee schedule, retrospective consent negotiation. -->
Served in 75 neighborhoods

Where in London we match contractors

All neighborhoods →

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

Talk to Baily about your London project

Start a scoping conversation. Baily verifies every matched contractor against the specific licensing, insurance, and permit requirements that apply in London before you get a quote.

Loading chat…

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.

Browse all Tier-1 guides →