Renovating a London Flat: Freeholder Consent, Service Charges, and Leasehold Constraints

Renovating a leasehold flat in London is substantively more complex than renovating a freehold house. The leaseholder does not own the building — they own a long lease on a defined part of it. The freeholder (or their managing agent) controls what can be done to the building fabric, requires consent for certain works, and may levy charges related to the administration of that consent. Navigating this correctly avoids the most common and most expensive mistakes in flat renovation.

What requires freeholder consent

The lease defines what alterations are permitted, what require licence (formal written consent), and what are absolutely prohibited. The relevant clause is typically headed "Alterations" or "Improvements." Common categories:

Absolute prohibition (cannot be done without negotiating a lease variation): - Structural alterations to load-bearing elements - Changes to the external appearance of the building - Works affecting the building's common services or structure

Permitted with licence (written consent): - Internal non-structural alterations (removing non-structural partitions, installing fitted furniture) - Installation of hard floor finishes (see below) - Wet room or bathroom alterations involving waterproofing - Kitchen alterations involving plumbing or electrical changes

Generally permitted without consent: - Redecoration within the demised premises - Replacement of fittings like-for-like (tap replacement, light fitting replacement)

The specific wording of the lease governs. Do not assume — read the lease before committing to any works, and if uncertain, seek written clarification from the freeholder or their solicitor before starting.

Hard floor finishes and acoustic obligations

The single most contentious alteration in a London flat renovation is the installation of hard floor finishes — timber, stone, tile — in rooms that previously had carpet. Most leases either prohibit hard floors entirely on upper floors or require them to achieve a minimum acoustic performance standard (typically ΔLw ≥ 17dB or similar, measured as impact sound insulation improvement).

Why: hard floors in upper-floor flats transmit impact noise (footsteps, dropped objects) to the flat below far more effectively than carpet. A neighbour who previously could not hear footsteps from the flat above will hear every step after carpet is removed. This is a genuine nuisance and a common source of neighbour disputes and lease enforcement actions.

Before specifying hard floors in an upper-floor flat: 1. Read the lease to determine whether consent is required and what acoustic standard applies 2. Seek licence from the freeholder if required, submitting the proposed floor specification and acoustic test data 3. Specify a floor system that meets the required acoustic standard — this typically means an acoustic underlay (minimum 5mm proprietary acoustic mat such as Regupol, Impact Barrier QT, or equivalent) beneath the finished floor, and a floating floor construction (not glued directly to the subfloor)

A floor installed in breach of the lease is a defect that must be disclosed on resale and may be the subject of an injunction requiring removal. The cost of compliance at installation is modest; the cost of remediation after completion is significant.

The licence for alterations process

A licence for alterations is a formal legal document between the leaseholder and the freeholder, consenting to defined works on specified conditions. The process:

1. 1.Leaseholder or their solicitor submits a request to the freeholder's managing agent, describing the proposed works and enclosing drawings and specification
2. 2.Freeholder instructs their surveyor to review the technical proposals (the leaseholder typically pays this fee — £500–£2,000 is common for a standard residential flat alteration)
3. 3.The freeholder's solicitor prepares the licence document; the leaseholder's solicitor reviews and approves it
4. 4.Both parties execute the licence; works can then commence

Timeline: allow 4–8 weeks for a straightforward licence application, longer if the freeholder is slow to respond or if technical objections are raised. Starting works before the licence is executed puts the leaseholder in breach of the lease.

Cost: freeholder's surveyor fee (£500–£2,000), freeholder's legal fee (£500–£1,500), and leaseholder's legal fee (£500–£1,000). Total: £1,500–£4,500 for a standard application. Budget for this as a project cost.

Party walls in flats

The Party Wall etc. Act 1996 applies to works in flats as well as houses. Works to walls, floors, or ceilings shared with a neighbouring flat require a party wall notice and, if the neighbour dissents, a party wall award.

In a flat, the floor/ceiling between units is a party structure. Works that affect the floor build-up — removing screed, adding underfloor heating, installing acoustic underlays — technically constitute "work to a party structure" and require party wall procedure. In practice, many flat renovation works proceed without party wall notices through informal agreement with neighbours, but this leaves the leaseholder exposed if damage claims arise later.

For any significant floor alteration in a flat above another occupied flat, serve party wall notice as standard practice. The process is straightforward if the neighbour consents.

Service charge and major works

The service charge — the leaseholder's contribution to the cost of maintaining, repairing, and insuring the building — is collected by the managing agent from all leaseholders. It is not related to the individual flat's renovation. However, there are two service charge issues that arise in the context of flat renovation:

Section 20 consultation: if the freeholder carries out major works to the building (roof replacement, external redecoration, lift replacement) and intends to recover the cost through the service charge, they must follow the Section 20 consultation process under the Landlord and Tenant Act 1985. Leaseholders are entitled to receive notice, obtain quotes, and make observations. Works carried out without Section 20 compliance can only be recovered to a maximum of £250 per leaseholder. Understanding your rights here prevents being overcharged for building maintenance.

Impact of renovation on insurance: if your renovation increases the reinstatement value of your flat (new kitchen, new bathrooms, structural alterations), the building insurance sum insured should be updated. Notify the freeholder of significant alterations. The building insurance is arranged by the freeholder and charged through the service charge; if underinsurance results from unreported alterations, the leaseholder may bear the shortfall in a claim.

Practical summary

Before starting any flat renovation in London:

1. 1.Read the lease (the alterations clause and the user clause)
2. 2.Identify what requires consent and apply for licence before starting
3. 3.Check acoustic requirements for hard floor finishes
4. 4.Serve party wall notices where applicable
5. 5.Notify the freeholder's managing agent of works (even where licence is not required, courtesy notification protects the relationship and the leaseholder's position if disputes arise)
6. 6.Ensure contractors are aware of building rules (working hours, goods lift access, waste removal routes)

The legal and administrative steps add 4–8 weeks to a flat renovation programme and £2,000–£5,000 in fees. They are not negotiable. Failing to take them creates liabilities that surface at the worst possible moment — typically on resale.