Kitchen Extension Builders in Mayfair (W1J, W1K)
Professional kitchen extension builders in Mayfair, Central London.
Why Choose All Well for Kitchen Extensions in Mayfair?
Kitchen projects in Mayfair are more often about reconfiguration than extension — the Georgian townhouses don't have rear gardens to extend into, but they have generous lower-ground floors that can be transformed into stunning kitchen-dining spaces. We've worked on Mayfair properties where the lower ground floor was a warren of servants' rooms and storage — and turned it into a single open-plan kitchen with custom joinery, Gaggenau appliances, and stone floors. It's a different kind of project, but the skills are the same.
Every project comes with a fixed-price contract, single project manager, and full certification including Building Control sign-off.
Kitchen Extensions for Mayfair Properties
Mayfair is known for its georgian townhouses, period conversions, luxury apartments. Our kitchen extensions services are tailored to these property types, ensuring results that complement the character of your home.
Postcodes we cover: W1J, W1K, W1S
Kitchen Extensions Tip for Mayfair Homeowners
Westminster Council manages Mayfair planning, and virtually every property is listed and within the Mayfair Conservation Area. Any kitchen work — even moving an internal wall or changing a door opening — needs Listed Building Consent. The process takes 8-12 weeks and requires a heritage impact assessment. We work with a heritage consultant from day one so the application is right first time. Construction hours in Westminster are strictly limited, and neighbour notifications are mandatory for any works that may cause noise or vibration.
Three Mayfair kitchen project patterns
Three patterns cover most of what we build in W1J, W1K, and W1S. Lower-ground-floor kitchen reconfiguration is the most common Mayfair project. Georgian townhouses have a lower-ground level that originally housed the kitchen, scullery, larder, and servants' quarters. The original walls subdivided this floor into 6-10 small rooms, none of which work for modern open-plan living. We open the load-bearing walls with a series of slimline steels (typically 152x89 UC and 178x102 UB depending on span and load), keep the original chimneybreasts and any decorative features, and create a single open-plan kitchen-dining-family space of 40-70 square metres. Cost is £200,000-£600,000 depending on size, scale of structural opening-up, and specification. Build time 16-26 weeks. Listed Building Consent applies, and the structural design retains the principal load paths through the original chimneybreasts. Luxury apartment kitchen renovation is the second pattern, common in the Mayfair mansion blocks (Audley Square, Hill Street, Curzon Street). Internal alterations only — no extension is possible. Cost is £80,000-£250,000 for a kitchen renovation including bespoke joinery, marble worktops, premium appliances, and any structural opening-up. Build time 10-16 weeks. Section 20 leaseholder consultation, Licence to Alter, and Westminster Listed Building Consent apply. Mews house kitchen extension where consented is the third pattern. Some Mayfair mews houses can support a small rear extension or roof addition where heritage impact is acceptable. Cost is £150,000-£400,000 reflecting the heritage materials, luxury specification, and complex planning process. Build time 24-36 weeks including planning timeline. Listed Building Consent and full Westminster planning permission both apply.
Westminster planning, listed buildings, and Mayfair Conservation Area
Three Mayfair-specific factors define every kitchen project — Westminster has some of the most demanding planning policies for residential heritage in the country. Grade II and Grade II* listed status. Most Mayfair properties are Grade II or Grade II* listed, requiring Listed Building Consent for virtually any change including internal layout alterations, removal or alteration of original features (Adam-style fireplaces, ceiling plasterwork, timber staircases, panelling, decorative cornicing), replacement of original windows or doors, render colour, and roof material changes. Application takes 12-16 weeks at the City of Westminster, which has dedicated heritage officers. We work with specialist heritage consultants and conservation-specialist architects experienced in Westminster requirements. Listed Mayfair work typically costs 50-100% more than equivalent work on a non-listed Kensington property and takes longer. Mayfair Conservation Area. Virtually every Mayfair property sits within the Mayfair Conservation Area. Westminster Council reviews any visible change individually and applies strict materials and design requirements — traditional London stock brick, lime mortar pointing, slate or natural-appearance roof material, timber sash windows matched to the original. Front-facing changes are virtually never approved; rear and roof additions are reviewed against detailed Conservation Area Appraisal guidelines. The Westminster pre-application advice service (4-6 weeks lead time) is essential before committing to designs to avoid costly refusals at the formal application stage. Construction hours and neighbour notifications. Westminster restricts construction hours to 8am-6pm Monday to Friday and 8am-1pm Saturday, with no Sunday or bank holiday working. Noisy works (breaking out, demolition, structural steel installation) are further restricted to specific hours. Neighbour notifications are mandatory for any works that may cause noise or vibration. We coordinate the Construction Management Plan and notifications as part of the project.
Project management on a Mayfair kitchen project
A Mayfair kitchen project involves 16-22 trades over 16-36 weeks: demolition, foundations and any structural strengthening, drainage (including any cast-iron stack replacement under heritage requirements), structural steel, brick and block (heritage matching), roofing, glazing (typically heritage timber sash with conservation-grade slim-profile double glazing), plastering (lime-based throughout listed properties), specialist plaster restoration where original Adam-style ceilings are affected, electrics (NICEIC to BS 7671 — concealed routing through 18-24 inch solid walls without damaging original plaster, panelling, or decorative features), plumbing, gas (Gas Safe), bespoke kitchen joinery (Bulthaup, Boffi, Smallbone, or specialist heritage joiners), Calacatta or Statuario marble or specialist stone worktops, premium appliances (Wolf or Sub-Zero American refrigeration, Miele or Gaggenau ovens, Quooker boiling taps), tiling, hardwood flooring (typically French oak parquet or stone), painting (heritage colours, hand-applied distemper or limewash on listed walls), gilding restoration on original ornamental work, French polishing of original timber, plus heritage trades on listed projects. We assign one project manager from survey through handover with photo updates throughout the build. Fixed-price contracts cover labour, materials, structural engineer calculations (£2,000-£6,000 for the steel and foundation design pack on listed Georgian townhouses), Building Control fees (£1,000-£2,000 at Westminster), FENSA glazing registration where applicable, party wall surveyor coordination, conservation architect coordination, heritage consultant fees, Listed Building Consent fees, planning fees, Section 20 leaseholder consultation, Licence to Alter coordination on mansion flat projects, and Construction Management Plan. The price doesn't change unless the specification does. Building Control inspections happen at structure, drainage, insulation (Part L: U-value 0.18 W/m²K for new walls and roof, with derogations for listed building fabric where compliance is impossible without harming heritage), and completion. Heritage materials and standards apply throughout listed projects.
Kitchen Extensions in Mayfair: What's Included
Kitchen Extensions Pricing in Mayfair
£45,000 – £90,000
10–14 weeks | Fixed-price contracts | No hidden costs
What Our Customers Say
“All Well managed our project from start to finish. The fixed-price contract meant no surprises, and the result is stunning.”
Verified Customer
Mayfair
“Professional team, clear communication throughout. They handled everything including Building Control sign-off.”
Verified Customer
Mayfair
Frequently Asked Questions
- How much does a Mayfair kitchen project cost?
- Lower-ground-floor kitchen reconfiguration on a Georgian townhouse (the most common Mayfair project) runs £200,000-£600,000 depending on size, scale of structural opening-up, and specification. Luxury apartment kitchen renovation in a Mayfair mansion block runs £80,000-£250,000. Mews house kitchen extension where consented runs £150,000-£400,000. Listed Building Consent on Grade II or Grade II* properties typically adds 50-100% to construction cost compared with equivalent work on a non-listed property. Section 20 consultation and Licence to Alter on mansion flats add £3,500-£8,000 in coordination and structural calculations. Construction Management Plan adds £8,000-£20,000. Fixed-price contract before any work starts.
- What's involved in working on a listed Mayfair property?
- Substantial planning preparation and longer build times. Most Mayfair properties are Grade II or Grade II* listed, requiring Listed Building Consent for virtually any change including internal layout alterations, removal or alteration of original features (Adam-style fireplaces, ceiling plasterwork, timber staircases, panelling, decorative cornicing), replacement of original windows or doors, render colour, and roof material. Application takes 12-16 weeks at the City of Westminster and runs in parallel with planning. We work with specialist heritage consultants and conservation-specialist architects experienced in Westminster requirements. Listed Mayfair work typically costs 50-100% more than equivalent work on a non-listed Kensington property and takes longer.
- Can I extend a Mayfair townhouse?
- Rarely. Almost all Mayfair properties are listed and within the Mayfair Conservation Area, and Westminster's planning policy strongly resists external extensions that affect the historic streetscape. Front-facing changes are virtually never approved. Rear extensions on listed properties require Listed Building Consent and are only approved in limited circumstances with traditional materials and sympathetic proportions. Most Mayfair kitchen projects focus on lower-ground-floor reconfiguration, internal layout changes, restoration of original features, and upgrade of building services rather than physical extension. For clients seeking more space, basement excavation may be possible but faces strict Westminster basement policy with Basement Impact Assessment requirements.
- Why hire All Well for a Mayfair kitchen project?
- Three reasons. First, planning experience: we handle Listed Building Consent, Section 20 leaseholder consultation, Licence to Alter on mansion flats, Construction Management Plan, and Westminster pre-application advice alongside the build. We work with specialist heritage consultants and conservation-specialist architects on every listed project. Second, full accreditation: NICEIC for electrical (BS 7671) — including concealed routing through 18-24 inch solid walls without damaging original plaster, panelling, or Adam-style ceilings — FENSA for glazing, Gas Safe registered for boiler relocation, structural engineer calculations included, and Building Control sign-off included on every project. Third, fixed-price contracts at ultra-luxury specification: the quote doesn't change unless the specification does, including heritage materials, hand-applied finishes, French polishing, gilding restoration, and luxury joinery and appliances (Bulthaup, Boffi, Smallbone, Wolf, Sub-Zero, Gaggenau). 57 verified Google reviews averaging 4.5/5. Office on Limes Avenue, SE20.
Kitchen Extensions Near Mayfair
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