What Does a London Home Renovation Actually Cost? A Room-by-Room Budget Guide for 2026

Planning a home renovation in London requires more than comparing headline figures. The final cost depends on the property’s age, existing condition, access, specification, structural requirements and the number of trades involved.

For 2026, the following figures provide realistic construction-only planning allowances for London homeowners. They include typical labour and materials but generally exclude professional fees, statutory approvals, VAT, loose furniture and unforeseen works. Every property is different, so these ranges should be used to establish a sensible starting point rather than as a fixed quotation.

At-a-glance London renovation budgets for 2026

Project scope	Indicative London budget
Cosmetic refresh of a typical house	£40,000–£90,000
Kitchen renovation	£18,000–£55,000+
Bathroom renovation	£10,000–£30,000+
Full 3-bedroom refurbishment	£140,000–£230,000
High-spec or structural refurbishment	£220,000–£350,000+
Loft conversion	£60,000–£180,000+
Single-storey rear extension	£80,000–£160,000+
Full electrical rewire	£8,000–£20,000+
New plumbing and heating installation	£15,000–£40,000+

These figures reflect the complexity and cost pressures associated with London construction. A detailed survey and clearly defined specification remain essential before committing to a budget.

Kitchen renovation costs

A kitchen is often the most services-intensive room in a house. It may require joinery, plumbing, electrical work, plastering, flooring, decorating and sometimes structural alterations.

Typical kitchen budget

• Straightforward replacement: £18,000–£30,000
• Mid-range family kitchen: £30,000–£45,000
• Bespoke or structurally altered kitchen: £45,000–£75,000+

The lower end may cover replacement units, standard appliances, updated lighting and limited making-good. Costs rise where the project includes:

• Removing walls or installing structural steel
• Moving gas, water and waste connections
• Bespoke cabinetry or integrated storage
• Stone or porcelain worktops
• Large-format flooring or specialist tiling
• Premium appliances and boiling-water systems
• New windows, rooflights or external doors

The Houzz 2026 UK Emerging Trends Report identifies growing interest in specialised storage, flexible islands and dedicated kitchen zones. These features can improve long-term functionality, but they should be included in the brief and budget from the outset rather than added during construction.

Bathroom renovation costs

A bathroom renovation generally costs more than homeowners first expect because much of the work is hidden behind walls and floors.

Indicative allowances are:

• Cloakroom or compact WC: £5,000–£12,000
• Standard bathroom: £12,000–£25,000
• High-specification bathroom: £25,000–£45,000+
• En-suite with complex plumbing or premium finishes: £15,000–£35,000

The principal cost drivers include the location of existing soil pipes, the extent of waterproofing, tiling coverage, sanitaryware, brassware, ventilation and underfloor heating.

A bathroom moved to another part of the property may require new waste runs, floor alterations and additional structural preparation. A detailed specification should therefore identify every fitting, finish and service connection rather than simply stating “new bathroom”.

Full house refurbishment

For a typical three-bedroom London terrace or similar property, a full mid-range refurbishment commonly falls between £140,000 and £230,000.

This may include:

• New kitchen and one or two bathrooms
• Full electrical rewire
• New plumbing and heating distribution
• Plastering and making good
• Internal doors, skirting and joinery
• Flooring and decoration
• Limited layout changes
• Compliance testing and certification

A high-specification refurbishment involving steelwork, bespoke joinery, new windows, insulation upgrades or extensive layout changes can exceed £300,000.

As a broad sense-check, full refurbishment projects are often assessed at approximately £1,200–£2,200 per square metre for mid-range work, although heavily structural or luxury projects can sit considerably higher. This is a planning benchmark, not a substitute for a measured quotation.

Loft conversions and extensions

A loft conversion can cost approximately £60,000–£180,000+, depending on the roof structure, dormer design, staircase, insulation, fire protection and internal fit-out.

A bedroom and en-suite conversion will normally cost more than a simple office or storage area. Structural strengthening, party wall matters, roof alterations and bespoke stairs can materially affect the final figure.

A single-storey rear extension of approximately 20–30 square metres may cost £80,000–£160,000+ in London before premium kitchen fittings and certain professional fees. Foundations, drainage diversions, steelwork, roof design, glazing and access are the principal variables.

Our project planning and design service can help establish the project scope before construction begins, which is particularly important where several trades and statutory requirements overlap.

Decoration and plastering

Decoration and plastering are often treated as finishing details, yet they can represent a substantial proportion of a refurbishment budget.

Indicative allowances include:

• Plaster skim and making good: £3,000–£12,000 for a typical house
• Extensive replastering: £10,000–£25,000+
• Full internal decoration: £8,000–£25,000+
• Specialist wallpapering or high-detail finishes: additional cost depending on preparation

Poor walls, historic lath and plaster, damp, failed render and uneven backgrounds can all increase preparation time. Our plastering and rendering solutions focus on creating a sound substrate before decorative finishes are applied.

Electrical rewire, plumbing and heating

A full electrical rewire for a London house may cost approximately £8,000–£20,000+, depending on the number of circuits, floor area, access, consumer unit requirements, lighting design and the extent of chasing and making good.

A new plumbing and heating installation may sit between £15,000 and £40,000+. This could include new pipework, boiler replacement, radiators, controls, hot-water arrangements and associated making good. Underfloor heating, heat-pump integration, upgraded hot-water storage and complex zoning will increase the allowance.

Our electrical services and plumbing and heating solutions are planned around the whole property rather than treated as isolated call-outs. This reduces the risk of conflicting work sequences and avoidable remedial costs.

What moves the cost up or down?

The most significant variables are:

• Property age and condition: older homes may conceal defective wiring, failing pipework, damp or inadequate structural alterations.
• Structural work: removing walls, installing steels, altering roofs and strengthening floors require design, engineering and specialist labour.
• Specification level: cabinetry, sanitaryware, appliances, flooring and ironmongery can vary substantially in price.
• Moving services: relocating kitchens, bathrooms, boilers or soil pipes usually requires more labour and making good.
• Access and parking: restricted access, upper-floor flats, congestion charges, permits and material handling affect productivity.
• Planning and party wall matters: professional advice, notices, surveys and approval conditions add both cost and time.
• Occupied properties: protecting furniture, maintaining temporary services and working in phases can extend the programme.
• Client changes: late decisions frequently create abortive work, reordering and programme disruption.

Hidden costs and contingency

A prudent contingency is usually:

• 10% for a well-surveyed, straightforward project
• 15% for an older property or substantial refurbishment
• 20% or more where the scope is uncertain, structural or subject to extensive opening-up

Also allow for:

• Architect, designer and structural engineer fees
• Planning applications and Building Control
• Party wall surveyors
• Asbestos surveys where appropriate
• Skip hire, waste disposal and temporary protection
• Storage or alternative accommodation
• Utility disconnections and reconnections
• VAT, where applicable
• Final cleaning, certification and remedial decoration

The cheapest quotation is often the most expensive outcome when it omits essential work, uses provisional allowances without explanation or fails to account for preparation and compliance. A responsible quotation should make inclusions, exclusions, assumptions and variations clear.

Project cost checklist

Before appointing a contractor, confirm that your budget addresses:

• Measured scope of work and drawings
• Kitchen, bathroom and appliance specifications
• Electrical points, lighting and heating requirements
• Structural calculations and building control
• Party wall and planning obligations
• Access, parking, skips and material storage
• Plastering, preparation and decoration
• Waste removal and final cleaning
• Programme, payment stages and variation procedure
• Contingency reserve of at least 10–15%
• Testing, certification and aftercare

Frequently asked questions

How much should I budget for a home renovation in London?

For a substantial three-bedroom refurbishment, a sensible initial allowance is £140,000–£230,000, excluding some professional fees and VAT. A lighter cosmetic project may cost considerably less, while structural changes, premium finishes and extensive services replacement can take the budget beyond £300,000.

Is it cheaper to renovate one room at a time?

It can be easier to fund, but it is not always cheaper overall. Phased work may involve repeated mobilisation, temporary protection, duplicated decoration and inefficient service installations. Where several rooms require new plumbing, heating or electrics, a coordinated programme often provides better cost control.

Should I renovate before moving into the property?

Where possible, renovating before occupation is usually more efficient. Contractors can work continuously, access is simpler and there is less risk of damaging furniture or disrupting daily routines. However, the decision should account for temporary accommodation, storage and the need to retain essential services.

How can I compare renovation quotations properly?

Compare the scope rather than only the total. Check whether each quotation includes preparation, waste, protection, certification, making good, final decoration and the exact specification of fixtures and finishes. Ask each contractor to identify exclusions, provisional sums and assumptions. A transparent quotation makes meaningful comparison possible.

What is the best way to control renovation costs?

Define the brief before work begins, select materials early, avoid unnecessary changes and maintain a contingency. We also recommend appointing a contractor who can coordinate multiple trades and keep you informed through each stage. That combination of planning, communication and technical stewardship is central to a successful renovation.

At Heritage Construction, we provide integrated building solutions across London, from initial planning through to completion and aftercare. With more than 25 years of combined experience across the trades, our objective is straightforward: to give homeowners a clear understanding of their options, costs and responsibilities before work starts. Contact our team to discuss your renovation requirements.