Flat Refurbishment in London — Costs, What's Involved, and Key Considerations

Flat refurbishments range from a light cosmetic refresh to a complete strip-and-rebuild. Common scope levels:

**Light refresh (cosmetic)**: new decoration, new flooring, updated light fittings, minor repairs. No structural or M&E works. This is common for buy-to-let flats being refreshed between tenancies.

**Moderate refurbishment**: new kitchen, new bathroom(s), new flooring throughout, full redecoration, possibly new electrical sockets and switches without a full rewire. Common for recently purchased flats being updated to owner-occupier standard.

**Full refurbishment**: complete strip-out, full electrical rewire, full plumbing replacement, new kitchen, new bathrooms, any partition changes, new flooring throughout, full redecoration. Common for poorly converted flats, older properties, or significant buy-to-let upgrades.

**With layout reconfiguration**: in some flats, removing or adding partitions can significantly improve the layout. For example, opening up a kitchen to the living room, or creating a second bathroom by taking space from a large bedroom. Layout changes require structural assessment (even non-structural partitions may have services in them) and may require permissions.

Almost all flats in London are leasehold — the owner holds a lease on the flat but not the freehold of the building. This creates legal considerations that don't apply to house renovations:

**Licence to alter**: most leases require the tenant (leaseholder — you, the flat owner) to obtain written permission from the freeholder or their managing agent before carrying out alterations to the flat. This is called a Licence to Alter.

• Works that typically require a Licence to Alter:
• •Structural changes (removing partitions, opening walls)
• •Changes to plumbing and drainage
• •Adding or removing bathrooms or kitchens
• •Any works to shared services (gas mains, electrical risers)
• •In some leases, even major cosmetic works like installing hardwood floors (due to noise transmission)

**Read your lease before starting**: some leases prohibit hard flooring entirely (laminate, hardwood, tile) in apartments above ground level — this is a noise transmission issue that protects lower-floor neighbours and the building as a whole. Installing hard flooring without checking your lease is a common mistake.

• **Building Management Company / Freeholder**:
• •Must be notified before works begin in most cases
• •May require sight of the contractor's insurance
• •May restrict working hours (typically 8am–6pm weekdays, no weekends in residential blocks)
• •May require building access protection (lift padding, corridor protection)
• •Some buildings have very specific requirements for waste removal routes

**Notification timeline**: allow 4–8 weeks to obtain a Licence to Alter if required. The managing agent will typically charge £300–£1,500 for reviewing and issuing the licence.

Flat refurbishments face structural limitations that house refurbishments do not:

**The structure is shared**: walls between flats, floors, and the building structure are typically shared or belong to the freeholder. You do not have the right to make structural changes to these elements without permission.

**Flat-to-flat party walls**: the wall between your flat and your neighbour's flat is a party wall. The Party Wall Act applies to works on this wall in the same way it applies to houses — you must serve notice before carrying out works.

**Concrete frame buildings**: many post-war London flat blocks are concrete frame construction. In these buildings, no internal partition wall (which are typically non-structural lightweight block or stud) may be load-bearing, but the concrete columns, beams, and slabs are structural elements that cannot be altered without structural engineering input.

**Floor soundproofing**: in flats, the existing floor construction between storeys may have inadequate acoustic insulation. If you lift existing floor finishes (carpet) and replace them with hard materials (tiles, timber, LVT), acoustic performance to the flat below may decrease. Some buildings and leases require a minimum acoustic specification. A floated floor system or acoustic underlay can mitigate this.

**Gas and electrical risers**: in apartment blocks, gas pipework and electrical distribution may run in vertical risers through the building. Routing new services through a flat must be designed around these risers — penetrating them or tying into them requires building management and potentially Gas Safe or NICEIC engineer involvement.

Flat refurbishment costs in London (2025):

• **Studio flat (25–35m²)**:
• •Light refresh: £8,000–£15,000
• •Full refurbishment: £18,000–£35,000

• **1-bedroom flat (40–55m²)**:
• •Light refresh: £10,000–£20,000
• •Moderate refurb (new kitchen, bathroom, flooring): £20,000–£40,000
• •Full refurbishment: £35,000–£60,000

• **2-bedroom flat (60–80m²)**:
• •Moderate refurb: £30,000–£55,000
• •Full refurbishment: £50,000–£85,000

• **3-bedroom flat (80–110m²)**:
• •Full refurbishment: £65,000–£110,000+

• **Key cost variables**:
• •Whether the bathroom and kitchen are replaced (the two largest cost items)
• •Extent of electrical and plumbing works
• •Flooring specification (carpet vs engineered oak vs tile)
• •Whether any partition changes are made
• •Building management requirements (lift protection, access constraints)
• •Whether the flat is occupied during works

**RCB standard position**: second-fix materials and kitchen/bathroom units are client-supplied unless otherwise agreed. This allows clients to control specification and cost.

Working in a flat in a multi-storey block presents logistical challenges that don't exist in a house:

**Waste removal**: all demolition waste must exit the building without using common areas for storage. In most blocks, waste must be bagged or contained and taken directly to a skip or waste vehicle. No loose rubble in corridors or on stairs. Budget for more time and cost for waste removal compared with a house.

**Delivery of materials**: large items (kitchen units, bath, plasterboard sheets) must be manoeuvred up stairs or in lifts. In buildings with small lifts, full sheets of plasterboard (2400mm × 1200mm) may need to be cut to fit. This adds time.

**Noise and working hours**: many residential buildings restrict working hours. 8am–6pm Monday to Friday is typical, often with no works at weekends. Plan the programme accordingly — a flat refurbishment that could be done in 8 weeks on a house may take 10–12 weeks in a restricted block.

**Parking and access**: street parking in inner London is typically controlled. A parking bay for the contractor's van often requires a resident permit application or a contractor's parking permit from the council (£100–£250 per week). Plan for this cost in the project budget.

**Neighbour consideration**: works in a flat affect multiple neighbouring properties — above, below, and to each side. Informing neighbours before works start, providing contact details, and responding quickly to concerns is both good practice and a contractual obligation in most residential buildings.