Flat Refurbishments in London: What's Involved and How to Plan Yours

The first practical step in refurbishing a London flat is to read the lease — specifically the alteration covenant, which describes what works require the freeholder's written consent and what, if anything, can be carried out without consent. Typical lease alteration covenant provisions: Internal decoration (redecoration within the flat, no structural or M&E works): usually permitted without consent, subject to not making alterations. Carpeting and soft furnishings: usually permitted without consent. Non-structural partition removal (removing a non-load-bearing stud partition wall): usually requires freeholder's written consent. Structural works (any alteration to the building's structure, including removal of a structural wall, any works to the floor slab or ceiling, any penetration of the structural floor for drainage or pipework): requires freeholder's written consent, typically under a Licence for Alterations. Wet room installation (adding a new bathroom or shower room where none exists — requiring new drainage penetrations through the floor): requires freeholder's written consent. Replacement of kitchen with a new wet kitchen layout (new drainage positions): requires freeholder's written consent. Underfloor heating (electric mat under screed, or wet UFH above the structural slab): almost always requires freeholder's written consent and is often restricted by the lease's acoustic requirements (the lease typically requires the leaseholder to maintain a specified acoustic separation between the flat and the flat below). Replacing carpets with hard flooring (replacing carpet with wood, tiles, or stone on an upper-floor flat): this is a very commonly disputed area. Many London leases in Victorian conversions specifically require the leaseholder of an upper-floor flat to maintain carpeting in all habitable rooms (to provide acoustic separation to the flat below). Replacing carpets with hard flooring in an upper-floor flat without freeholder consent is a breach of the lease and can result in the freeholder requiring reinstatement. The Licence for Alterations process: when freeholder consent is required for proposed works, the leaseholder (or their solicitor) applies to the freeholder (or the freeholder's managing agent) for a Licence for Alterations — a legal document setting out the permitted works, the conditions (e.g., works to be carried out by a named contractor, structural engineer's design to be approved, acoustic specification to be met), and the freeholder's surveyor's fee. Typical freeholder's surveyor fee for a Licence for Alterations in a London flat: £500-£2,500 depending on the complexity of the works. Allow 4-8 weeks for the Licence for Alterations process.

The structural constraints of a London flat refurbishment depend on the type of construction: Victorian or Edwardian conversion (most common in inner London): a large Victorian house divided into flats. The structural elements are: original solid brick external walls (load-bearing, not to be penetrated without structural engineer's design and freeholder's consent); original timber floor structure (typically 200-225mm deep timber joists on 400-450mm centres, original Victorian construction — not designed for UFH screed, not designed for the weight of solid stone flooring without structural assessment); internal walls which may be either load-bearing (brick, typically at mid-span or at a structural cross wall) or non-load-bearing (timber stud). Identifying whether an internal wall is load-bearing: a structural engineer's assessment is required before removing any internal wall in a Victorian conversion flat. The fact that a wall is a timber stud does not mean it is non-load-bearing — in some Victorian conversions, stud partitions carry the ends of the floor joists and removal would cause floor deflection. Post-war mansion flat or purpose-built block (1930s-1970s): typically reinforced concrete frame construction with flat concrete floor slabs. The frame (columns and beams) is structural — the internal walls are typically non-structural block or stud partitions that can be removed with freeholder consent but without structural consequence. The concrete slab can be penetrated for drainage but only with structural engineer's design (locating structural reinforcement before coring is essential — a structural core through a reinforcing bar is a serious structural defect). Modern residential conversion or new build (post-2000): typically reinforced concrete or light gauge steel frame. Same principles as post-war blocks. Acoustic constraints in a London flat: the acoustic separation between floors in a London Victorian conversion is often poor by modern standards — Victorian timber floor construction typically provides 40-45 dB Rw airborne and 75-80 dB LnT,w impact. The leaseholder has an obligation to maintain this separation and cannot make it worse. Adding a hard floor finish without an acoustic mat (minimum 10mm Regupol or equivalent, providing approximately 17-22 dB impact improvement) is a significant breach of the acoustic standard — particularly if the flat below is occupied. Freeholders in London increasingly require leaseholders to submit an acoustic specification for new floor finishes (demonstrating that the finished floor will not reduce the acoustic separation to below the required standard).

A full refurbishment of a London flat covers everything from strip-out to completed decoration. The scope varies significantly by flat size and specification level — but a typical full refurbishment of a 2-bedroom, 2-bathroom London flat (approximately 60-80m²) includes: Strip-out: remove existing kitchen units, appliances, sanitary ware, floor finishes (carpet, tiles), non-structural partition walls (if any reconfiguration is proposed), and all existing light fittings and switches. Structural works (if required): remove a non-structural partition wall to reconfigure layout (structural engineer's sign-off required); form new doorway through an existing wall (lintel and temporary support); and any structural floor penetrations for new drainage runs. First-fix electrical: completely rewire the flat with a new consumer unit (distribution board), new ring mains for each room, and sockets, switches, and data points positioned to the new layout drawing. A full rewire of a London flat is typically warranted if the flat has original 1960s or 1970s wiring, if the consumer unit is a fuse board rather than a miniature circuit breaker board, or if the flat has been extended or significantly altered without updating the electrics. First-fix plumbing: reroute the hot and cold supply pipework to the new kitchen position and bathroom positions; install new copper or press-fit pipe distribution from the incoming mains and from the hot water cylinder or combi boiler; install the soil waste stacks for the new bathroom positions (with freeholder consent for any new penetrations through the structural floor slab). New bathroom pods or wet rooms: waterproof the bathroom floors and walls (tanking with a liquid membrane such as BAL Tank-it or Wedi), lay floor tiles with correct falls to the drain, install shower trays or wet room former, and first-fix for sanitary ware. Insulation and acoustic mat: lay acoustic mat (Regupol 7mm-10mm or similar) before the floor finish in any upper-floor flat where hard flooring is specified. This is typically required by the freeholder's Licence for Alterations. Floor finishes: porcelain or ceramic floor tiles in kitchen and bathrooms; engineered oak or LVT in living and bedroom areas (with acoustic mat below on upper floors). Skim plasterboard and plastering: plasterboard new partition walls, skim any damaged areas of existing plaster, and skim all rooms to a flat finish ready for decoration. New kitchen: supply and install of the new kitchen (units, worktop, appliances — note that all kitchen appliances and second-fix finishes are typically client-supplied under RCB's standard approach). Second-fix electrical: fit all sockets, switches, light fittings, and the consumer unit. Second-fix plumbing: fit sanitary ware, taps, shower, and kitchen sink and appliances. Decoration: two coats of emulsion throughout.

Flat refurbishment costs in London vary based on the size of the flat, the extent of the structural and M&E works, the specification level of finishes, and whether the kitchen and bathrooms are being fully reconfigured or simply updated. Indicative cost ranges for London flat refurbishments in 2025 (construction costs, excluding kitchen furniture/appliances and client-supplied second-fix materials): Cosmetic refurbishment (decoration, new floor finishes throughout, minor kitchen and bathroom update — no structural or M&E works): 1-bed flat (45-55m²): £8,000-£18,000. 2-bed flat (60-80m²): £12,000-£25,000. Mid-range refurbishment (new kitchen layout, one new bathroom, electrical consumer unit upgrade, new floor finishes, decoration — some structural non-load-bearing partition removal): 1-bed flat: £25,000-£45,000. 2-bed, 2-bath flat: £35,000-£65,000. Full refurbishment (complete rewire, complete replumb with new positions, two new bathrooms, new kitchen reconfigured, floor levelling, structural partition removal, new acoustic matting, full decoration): 1-bed flat: £40,000-£65,000. 2-bed, 2-bath flat: £60,000-£95,000. 3-bed, 2-bath flat (80-100m²): £80,000-£130,000. Key cost drivers: full rewire (£4,000-£9,000 for a 2-bed flat depending on complexity); replumb with new positions (£3,000-£8,000); new bathrooms (£4,000-£8,000 per bathroom for standard specification, excluding sanitary ware); kitchen layout (£3,000-£8,000 for installation, excluding units and appliances); acoustic mat throughout living and bedroom areas (£600-£1,500 for a 2-bed flat). Note: kitchen furniture, sanitary ware, tiles, floor finishes, and light fittings are typically client-supplied under RCB's standard flat refurbishment approach — the above costs are for labour and contractor-supplied materials only.