Replacing windows in a flat or leasehold

Replacing windows in a leasehold flat is a little different from a freehold house. The glass and frames may be inside your home, but the external structure — and often the windows themselves — can belong to the freeholder or be shared between all the leaseholders. That means a straightforward window swap can need written permission before any installer lifts a tool. Getting this right early saves you from ordering windows you are not allowed to fit.

Check the lease first

Your lease is the starting point. Read the sections on repairs, alterations and the demised premises to see who is responsible for the windows and whether you need consent to change them. Many leases require the freeholder’s written approval — sometimes called a licence to alter — before you replace windows, and may specify that new units must match the existing style and colour so the building stays uniform. If the wording is unclear, your managing agent or a conveyancing solicitor can confirm what applies.

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Freeholder and managing-agent permission

Where consent is needed, write to the freeholder or managing agent with the details: the window type, frame material and colour, the glass specification and the installer you intend to use. They may ask for the installer’s credentials and insurance, and for the work to be registered under a competent-person scheme. Allow time for this — approval can take a few weeks, so start the conversation before you commit to a fitting date. Choosing a matched, well-reviewed installer helps; if you are still weighing up options, this guide on repair or replace — how to decide is a useful reference.

Conservation areas and listed buildings

If your block sits in a conservation area or is listed, there may be additional planning controls on window style and material — particularly for period sash windows. To keep the frontage consistent and compliant, compare window styles to replace like-for-like and read our sash window replacement guide, which covers period-appropriate options. Building regulations apply to replacement windows in flats just as they do in houses, so confirm your installer registers the work.

Getting a quote for a flat

You can gather quotes while permissions are in progress — just make sure the specification matches what your freeholder will approve. Prices vary by window type, access and region, so treat any single figure as a starting point. You can get a fast quote direct, no showroom, or browse the current double glazing deals and prices for context. Funding and contribution options may be available subject to eligibility and a home survey, and £0-upfront options may be available for those who qualify. The quote and home assessment are free and no-obligation. See our replacement window quote checklist to keep every quote comparable.