Exclusive Builders in Kensington
Ultra-premium extensions, exquisite renovations, and bespoke conversions for the most discerning homeowners in Kensington, W8.
Ultra-Premium Construction Services in Kensington, W8
Kensington stands as one of the world's most illustrious residential addresses, where grand stucco-fronted townhouses, magnificent period mansions, and elegant garden squares define a neighbourhood of unparalleled prestige. For the most discerning homeowners in W8, Alstruct Ltd delivers an exclusive construction service meticulously crafted to the extraordinary standards that Kensington demands. Every detail, from the initial design concept to the final finishing touch, reflects our unwavering commitment to excellence.
The architectural landscape of Kensington is nothing short of breathtaking. From the imposing white-stucco crescents near Kensington Palace to the exquisite period townhouses of Kensington Square — one of London's oldest squares — these properties represent the pinnacle of residential grandeur. Our ultra-premium service encompasses bespoke rear extensions with bi-fold glazing opening onto landscaped gardens, luxury basement excavations creating cinema rooms and wellness suites, and comprehensive whole-house renovations that transform these magnificent properties into contemporary masterpieces.
The Royal Borough of Kensington and Chelsea maintains some of London's most stringent planning controls, with extensive conservation areas and numerous listed buildings throughout W8. Alstruct brings proven expertise in navigating these exacting requirements, working in close consultation with the borough's planning and conservation officers to achieve approvals that respect architectural heritage while delivering the transformative results our clients envision.
Why Choose Alstruct in Kensington?
- Unrivalled expertise in Kensington's grand stucco-fronted townhouses and period mansions
- Proven track record navigating the Royal Borough of Kensington and Chelsea's strict planning policies
- CHAS Elite, Constructionline Gold & FMB certified — the highest industry accreditations
- Bespoke architectural design with exquisite attention to period detail
- Ultra-premium materials and finishes sourced from the finest suppliers
- Specialist experience with listed buildings and conservation area properties
- Dedicated project director providing white-glove service throughout
- Exceptional portfolio of completed projects in Kensington and prime Central London
Frequently Asked Questions — Kensington
How much does an ultra-premium extension cost in Kensington W8?
Ultra-premium extensions in Kensington typically range from £3,500-£6,000+ per square metre, reflecting the exacting standards expected in one of London's most exclusive postcodes. A bespoke rear extension averages £100,000-£200,000, while luxury basement conversions can exceed £300,000. Contact Alstruct for a no-obligation consultation.
Are there conservation area restrictions in Kensington?
Yes, much of Kensington falls within the Royal Borough of Kensington and Chelsea's extensive conservation areas, including the Kensington Square and De Vere conservation areas. The borough has some of London's strictest planning policies to protect its grand stucco-fronted architecture. Alstruct has proven expertise navigating these requirements.
Do you specialise in Kensington's grand townhouses?
Absolutely. We have particular expertise in Kensington's magnificent stucco-fronted townhouses, period mansion conversions, and listed buildings. Our team understands the intricate architectural detailing and the ultra-premium finishes that discerning Kensington homeowners demand.
Can you manage basement excavations in Kensington?
Yes, Alstruct has extensive experience with basement excavations in Kensington, subject to the Royal Borough of Kensington and Chelsea's strict basement planning policy. We manage structural engineering, party wall agreements, and compliance with construction management plans.
Ultra-Premium Construction Services in Kensington
Luxury House Extensions Kensington
Exquisite rear, side and orangery extensions meticulously crafted to complement Kensington's grand stucco-fronted architecture.
Learn more →Bespoke Loft Conversions Kensington
Premium mansard and dormer conversions creating opulent additional living space in Kensington's distinguished townhouses.
Learn more →Exquisite Home Renovations Kensington
Complete whole-house transformations elevating Kensington properties to the pinnacle of contemporary luxury living.
Learn more →Luxury Basement Conversions Kensington
Expert subterranean development creating cinema rooms, wellness suites, and bespoke living spaces beneath Kensington homes.
Learn more →Groundworks Kensington
Specialist foundations, underpinning and structural works for premium construction projects across Kensington W8.
Learn more →Hard Landscaping Kensington
Exquisite garden designs, natural stone terraces and bespoke outdoor entertaining spaces for Kensington's finest residences.
Learn more →House extensions in Kensington
Kensington is Victorian stucco terraces and garden squares around Kensington Church Street and Holland Park, mews houses, and mansion flats along Kensington High Street. Kensington extensions are mostly lower-ground and basement projects, rear closet-wing infills and mews conversions, designed around listed building and conservation requirements.
Budget guidance for Kensington: expect £2,500–£4,000 per m² for a single-storey extension, which puts a 25–30 m² kitchen extension at £75,000–£120,000; two-storey and wraparound schemes are priced on the structure involved (see our house extension cost guide). Nearly all of Kensington is conservation area with many listed buildings, and the Royal Borough of Kensington and Chelsea applies a strict basement policy. Where approval from the Royal Borough of Kensington and Chelsea is needed, our in-house design team prepares and submits the application.
Loft conversions in Kensington
Roof extensions are usually mansards or reconfigured top floors on the terraces and mews, subject to the council's conservation guidance.
Typical London figures are £25,000–£45,000 for a Velux conversion, £45,000–£75,000 for a dormer and £60,000–£100,000+ for a mansard (details in our loft conversion cost guide). Every Kensington loft quote follows a measured survey of the roof, head height and stair position, and includes Building Regulations sign-off, fire doors and structural calculations.
Renovations and refurbishment in Kensington
Kensington projects are high-end refurbishments of townhouses, mews houses and lateral apartments with bespoke joinery and full services. Typical Kensington refurbishments include structural openings with steel beams, new kitchens and bathrooms, rewiring, heating and period repairs such as sash windows, cornices and floors. Budgets are set out in our renovation cost guide; in Kensington, as everywhere, we work to a JCT contract, a written specification and a 10-year workmanship warranty.
Alstruct projects near Kensington
Dunstan Road, Golders Green NW11
Rear extension, two-storey side extension and full renovation of a 1930s semi-detached house.
About 5 miles from Kensington · View project →Whitehall Park, Archway N19
Full Victorian terrace renovation and rear extension with triple glazing and aluminium sliding doors.
About 5 miles from Kensington · View project →Hawthorn Cottage, Limehouse E14
Underpinning, ground and first-floor extensions and a full renovation with bespoke joinery.
About 7 miles from Kensington · View project →Beyond the projects above, we have recent and current sites in W4, W14, W6, NW8, NW6, W11, W12 and SW6 within about five miles of Kensington, and we work across every London borough from our office in South Woodford, E18. See all completed projects →
We Also Cover Areas Near Kensington
Common questions about building in Kensington
Do Alstruct cover Kensington?
Yes, Alstruct regularly works on extensions, renovations and loft conversions across Kensington and surrounding London neighbourhoods. We visit, measure and provide a written quote.
How much does a house extension cost in Kensington?
House extensions in Kensington typically cost £50,000–£200,000+ depending on size, specification and the property's existing structure. Stucco terraces and victorian townhouses are the most common build type in the area, and our quote will reflect the specific condition and layout of the property.
Do I need planning permission for an extension in Kensington?
Kensington sits in Kensington Conservation Areas, which means Permitted Development rights are restricted and most extensions require full planning permission from Kensington & Chelsea Council. We handle the planning application, design drawings and party wall notices on your behalf.
What types of property do you work on in Kensington?
Most Kensington projects we deliver are on Stucco terraces and Victorian townhouses. We have direct experience with the structural, compliance and aesthetic considerations specific to these property types, including listed building consent work where applicable.
How quickly can Alstruct start a project in Kensington?
Once design and approvals are signed off, we typically start on site in Kensington within 6–12 weeks depending on programme availability. Planning + design adds 8–16 weeks before site start. For urgent projects, get in touch on 020 8080 8240 to discuss timing.
Are you accredited to work in Kensington?
Yes. Alstruct holds CHAS Elite, Constructionline Gold and Federation of Master Builders (FMB) accreditation, with £10M public liability insurance, JCT contracts as standard, and a 10-year workmanship warranty on every project — including all work in Kensington.
Nearby areas we cover
Alstruct works across every London borough. Here are areas close to Kensington with dedicated local pages: