How Much Does It Cost to Renovate a House in London?

Why renovation costs vary so widely

It is common to encounter published cost guides that present single figures for a house renovation. Those figures are rarely useful, because renovation costs in London depend on a combination of factors that no single number can capture.

A light cosmetic refurbishment — new decoration, flooring, and a bathroom replacement — and a full structural renovation with basement extension and high-specification fit-out are both described as “house renovations.” They can differ in cost by an order of magnitude.

This guide sets out the principal cost drivers honestly, provides indicative budget bands based on 2026 market conditions, and explains what a proper quotation should include. For a figure that is actually meaningful for your property, you need a site visit and a detailed brief — our renovation process page explains how we approach that.

The principal cost factors

Property size

Cost scales with floor area, though not linearly. Larger properties benefit from some economies in mobilisation and site establishment costs spread across more square metres. As a working assumption, per-square-metre rates are a useful planning tool, but they must be applied with the other factors below firmly in mind.

Current condition

Strip-out frequently reveals problems that were not visible during a pre-purchase survey: failed joist ends, corroded or lead pipework, asbestos-containing materials in floor tiles or artex, failing chimney breasts, and damp at various points in the fabric. Each finding adds cost. Properties that have been vacant, poorly maintained, or subdivided into flats tend to carry more concealed defects than regularly occupied family homes.

Structural work

Structural alterations — opening up floors, removing load-bearing walls, installing steels, underpinning, or creating basement space — are among the most expensive line items in any renovation. They also require a structural engineer’s design, Building Regulations approval, and careful sequencing with other trades. If your scheme involves significant structural change, this must be accurately scoped before any budget is considered reliable.

Quality of finishes

The difference between mid-range and high-specification finishes is substantial. Stone worktops versus laminate, bespoke joinery versus off-the-shelf units, underfloor heating versus radiators, and handmade tiles versus standard ceramic each represent meaningful cost decisions. These are not frivolous choices — the finish specification is one of the biggest levers available to a client managing a budget.

Kitchens and bathrooms

Kitchens and bathrooms are the most cost-variable rooms in any renovation. A mid-range kitchen installation (supply and fit, including appliances) occupies a very different budget position from a fully bespoke fitted kitchen with high-end appliances and stone throughout. We cover this in more detail on our kitchen renovation and bathroom renovation pages.

Mechanical and electrical services

A full rewire, new consumer unit, and installation of a modern heating system — whether radiator-based or underfloor — represent a significant but usually non-negotiable cost in an older property. Service installations are largely invisible in the finished building, which can make them feel like poor value, but they underpin the safety and efficiency of the home for decades.

Professional fees

Architects, structural engineers, planning consultants, interior designers, party wall surveyors, and — where the client appoints one separately — a project manager all add to the total cost of a project. These fees are not included in construction costs and should be budgeted separately. A project requiring planning permission, listed building consent, or complex party wall awards will incur higher professional fees than a straightforward permitted-development scheme.

Planning and approvals

Planning application fees are set by statute and are relatively modest. However, the time cost of a contested planning process, the need to commission additional reports (heritage, daylight, acoustic, ecological), and the possibility of refusal and appeal can all affect both budget and programme.

Access and logistics

London sites impose costs that are absent elsewhere. Skip permits, parking bay suspensions, road closure licences for crane lifts, and working-hour restrictions all add overhead. Properties with restricted vehicle access — narrow mews, congestion-charge zones, or streets with delivery restrictions — cost more to service than easily accessible sites. This is a genuine and significant factor in central London.

Contingency

A contingency is not a padding exercise — it is a rational allowance for the unknowns that are present in every renovation, and that become knowns only once work starts. We recommend 10–15% of the construction budget as a minimum contingency. On Victorian or Edwardian properties, or on any building that has not been surveyed in detail, the higher end of that range is prudent.

Indicative budget bands

The figures below are indicative 2026 ranges only. They are exclusive of VAT (currently 20% for standard-rated residential works), exclusive of professional fees, and explicitly not a quotation. They assume London labour rates and standard London logistics. Actual costs for any specific property may fall outside these ranges.

Scope	Indicative range (ex-VAT, ex-fees)	Key assumptions
Light refurbishment (decoration, flooring, bathrooms only, no structural work)	£400–£700 per m² of floor area	No structural alterations, no full rewire, mid-range finishes
Mid-range full renovation (new M&E, kitchen, bathrooms, some structural work, mid-range finishes)	£800–£1,400 per m² of floor area	Full rewire and replumb, one structural alteration, mid-to-good finishes
Comprehensive renovation (full structural reconfiguration, high-specification fit-out, bespoke joinery)	£1,500–£2,500+ per m² of floor area	Multiple structural alterations, underfloor heating, high-specification kitchens and bathrooms, bespoke joinery throughout
Basement conversion or extension within renovation contract	Priced separately per project	Highly variable; dependent on structural complexity, waterproofing method, and finishes

These bands are provided as a planning orientation, not a basis for budget commitment. A terraced house of 100 m² in reasonable condition being renovated to a mid-range specification is a different proposition from the same floor area in poor condition with a high-specification brief — the same band may not apply to both.

For works that fall within specific service categories — loft conversions, home extensions, or bespoke joinery — refer to those pages for additional cost context.

What a quotation should include

A properly prepared renovation quotation is not a single figure. It should break the project into discrete packages — demolition, structural works, electrical, plumbing and heating, plastering, carpentry, kitchens, bathrooms, flooring, decoration, external works — with each package priced separately and a clear statement of what is included and excluded.

It should state whether provisional sums have been used for any elements (typically finishes not yet fully specified), what those provisional sums assume, and how variations against them will be handled.

It should set out the programme — start date, key milestones, anticipated completion — alongside the contract format and payment terms.

A quotation that does not provide this level of detail is difficult to compare against others and provides poor protection if disputes arise during the works. Our quotations are itemised to this standard as a matter of course.

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To receive a proper quotation for your renovation, contact us with a brief description of the property and the scope of works you have in mind. We will arrange a site visit and provide a detailed, written response.

Are the figures on this page guaranteed prices?

No. Every figure on this page is indicative only, based on broad 2026 market conditions, and is explicitly not a quotation. Actual costs depend on the specific property, scope of works, and chosen specification. We provide a fully itemised written quotation after a site visit and detailed brief — contact us to arrange one.

Do the costs include VAT?

No. All indicative figures on this page are exclusive of VAT. Residential renovation work is standard-rated at 20% VAT. Some reduced-rate reliefs apply in specific circumstances — for example, certain works on properties that have been empty for two or more years — and your contractor or VAT adviser can advise on whether any relief is available to you.

What professional fees should I budget for?

Professional fees — architects, structural engineers, party wall surveyors, planning consultants, and project managers — are not included in the contractor budget figures shown here. Depending on scope, professional fees commonly add 10–18% on top of construction costs, though this varies significantly with the complexity of the project and the professionals appointed.

How does the condition of the property affect costs?

Materially. A property that has been maintained and only requires cosmetic updating costs considerably less to renovate than one with failing services, structural defects, damp ingress, or significant fabric deterioration. We assess condition thoroughly during the survey stage and highlight findings before you commit to a contract.

Is a contingency budget really necessary?

Yes, and particularly so with London period properties. Concealed defects — failed joist ends, corroded pipes, asbestos-containing materials, defective chimney structures — are common and only become visible once strip-out begins. A contingency of 10–15% of the construction budget is a prudent minimum; on older or poorly documented properties we would suggest planning for the higher end of that range.