How Much Does a High-End Home Renovation Cost in London?
A high-end renovation can involve a substantial investment, but a square-metre figure only becomes useful when you know what it includes.
Refurbishing existing rooms, adding an extension and furnishing the finished home are different parts of the budget. Combining them into one unexplained rate can make a project appear more affordable—or more expensive—than it actually is.
Start with the property’s condition, the area being renovated and the level of finish you want. Then develop a cost plan around the agreed scope.
What Counts as a High-End Renovation?
A high-end renovation places particular emphasis on design, material specification, craftsmanship and carefully coordinated details.
It may include:
- A redesigned kitchen and bathrooms.
- Bespoke wardrobes and fitted storage.
- Detailed lighting and electrical planning.
- Specialist finishes and stonework.
- Improved heating, ventilation or controls.
- Layout changes where they improve the home.
Structural alterations are not essential to make a renovation high-end. A carefully refurbished apartment can achieve a considered finish without moving walls.
Our design and build service connects these design decisions with refurbishment planning and delivery.
How Much Does a High-End Renovation Cost Per Square Metre?
Published London estimates vary considerably because they describe different scopes.
For context, MW Architects identifies approximately £3,000 per m² as an early budgeting starting point for a substantial, good-quality London refurbishment. Bradley Van Der Straeten Architects suggests approximately £3,000–£3,400 per m² excluding VAT for a substantial project combining refurbishment with an extension. These are practice-specific benchmarks, not Oraanj quotations or universal market rates.
More complex work or specialist specifications can exceed these figures.
Before using a rate, ask:
- Which floor area is being measured?
- Does it include extension work?
- Are kitchens, bathrooms and joinery included?
- Are professional fees and VAT additional?
- Does it include furniture and decorative lighting?
- Is there an allowance for unforeseen work?
What Would That Mean for a 150 m² Property?
As a simple illustration, 150 m² multiplied by an assumed £3,000 per m² produces £450,000 for the scope covered by that rate.
That does not automatically mean £450,000 is the complete project budget. Fees, VAT, furniture, external works and contingency may be additional.
The calculation is a starting exercise, not a quotation. A measured survey and developed specification are needed to establish a budget for your property.
Should Extension Costs Be Separate From Refurbishment Costs?
Yes, unless your cost consultant or contractor has clearly explained a combined rate.
An extension creates new space and may involve foundations, structure, roofing and external walls. Refurbishment works within an existing building, although substantial alterations may still be required.
Ask for the existing house works and extension works to be identified separately. This makes it easier to understand where the budget is going and assess alternatives.
It also prevents you from accidentally adding extension costs twice when comparing estimates.
What Should My Total Renovation Budget Include?
A complete budget should account for the work required to design, deliver and finish the home.
| Budget category | What to include |
|---|---|
| Surveys and professional services | Design, technical advice and specialist input |
| Building works | Strip-out, alterations, repairs and preparation |
| Services | Plumbing, electrical, heating and ventilation work |
| Kitchens and bathrooms | Cabinetry, sanitaryware, appliances and installation |
| Bespoke joinery | Wardrobes, media units, shelving and fitted storage |
| Finishes | Flooring, tiling, decoration and specialist surfaces |
| Furniture and fittings | Loose furniture, window treatments and decorative lighting |
| Project coordination | The management services included in each appointment |
| Additional allowances | Applicable VAT, contingency, storage and temporary accommodation |
Check for overlap between quotations so the same service is not counted twice.
Why Do Kitchens and Bathrooms Affect the Budget So Much?
Kitchens and bathrooms bring together fittings, services, finishes and specialist installation within a relatively small area.
A kitchen renovation may involve cabinetry, worktops, appliances, electrical alterations and plumbing. Moving the layout can add work beyond the cost of the new kitchen itself.
Similarly, a bathroom renovation needs coordinated drainage, waterproofing, ventilation, lighting and fitted elements.
Confirm what is included in supply prices and what must be allowed for separately.
Why Can London Renovations Be More Expensive?
Site conditions can add costs that are less obvious than materials and labour.
Examples include:
- Restricted delivery access.
- Limited space for storing materials.
- Parking and loading arrangements.
- Working-hour restrictions.
- Shared entrances and communal-area protection.
- Specialist work to existing features.
The effect varies by property. A postcode alone does not establish the construction cost, and a fixed London-wide percentage uplift will not explain every project.
How Much Contingency Should I Allow?
Set the contingency according to the uncertainties in the project rather than applying one percentage automatically.
An older property with limited survey information may need a different allowance from a well-understood refurbishment with a settled specification.
Discuss the risks with your project team, keep contingency separate from planned purchases and review it as more information becomes available.
It should provide room for unforeseen requirements, rather than act as an unallocated finishes budget.
How Can I Reduce Costs Without Losing the Design?
Resolve the layout first, then identify where spending makes the greatest practical difference.
Options may include:
- Retaining suitable existing elements.
- Keeping service positions where they work well.
- Simplifying joinery profiles.
- Using bespoke furniture only where it solves a specific problem.
- Choosing a smaller, coordinated material palette.
- Selecting available products with manageable lead times.
Early interior architecture planning helps assess these choices before installation begins.
Does Design and Build Guarantee Better Cost Control?
No delivery model guarantees that a project will remain within budget. A coordinated team can, however, help connect design decisions with construction pricing and procurement.
The important controls are a defined scope, clear specifications, regular cost reporting and written approval of changes.
Ask who tracks spending, how allowances are updated and what happens if the design develops beyond the original budget.
How Can I Get a Realistic Renovation Budget?
Share your property plans, photographs, intended changes and approximate investment with the project team.
Explain whether the budget must cover construction alone or everything through to furniture and installation. This distinction should be clear from the first conversation.
Oraanj’s London renovation team can help define the scope and the information needed for a project-specific cost plan.
Discuss your home renovation with Oraanj before committing to major purchases or building work.
