Premium Builders in Islington
Bespoke luxury extensions, exquisite renovations and premium conversions for Islington's elegant Georgian squares and townhouses.
Builders in Islington, N1
Islington stands as one of London's most architecturally distinguished boroughs, a treasure trove of elegant Georgian squares, handsome Victorian terraces and graceful Regency crescents. From the pristine garden squares of Barnsbury and Canonbury to the fashionable boutiques of Upper Street, the London Borough of Islington attracts discerning homeowners who demand the very finest in residential construction. Alstruct Ltd delivers a premium, bespoke service meticulously tailored to the unique requirements of Islington's extraordinary property stock.
The borough's exceptional period properties — from the grand four-storey townhouses of Gibson Square and Lonsdale Square to the elegant terraces of Noel Road and Colebrooke Row — present remarkable opportunities for luxury transformation. Side-return extensions that create breathtaking open-plan kitchens, basement excavations that add entire floors of premium living space, and comprehensive whole-house renovations that marry Georgian elegance with contemporary refinement are among Alstruct's specialities. Every detail, from bespoke joinery and heritage plasterwork to underfloor heating and smart home integration, is executed with impeccable craftsmanship.
With Angel station on the Northern line placing the West End and City moments away, Islington's premium property market continues to thrive. Alstruct's experienced team possesses intimate knowledge of Islington Council's planning framework, including the borough's numerous conservation areas and the particular sensitivities surrounding its rich architectural heritage. Our design team, working with your architect or ours, our project managers and specialist trades see each project through to completion.
Why Choose Alstruct in Islington?
- Specialists in Georgian townhouses, Victorian terraces and period conversions
- Working knowledge of Islington Council's 42 conservation areas
- CHAS Elite, Constructionline Gold & Federation of Master Builders certified
- Complimentary site survey with bespoke, itemised quotation
- Dedicated project manager from concept through to completion
- Our design team, working with your architect or ours on period houses
- Premium materials and specialist period-appropriate finishes
- Extensive portfolio of high-end projects across the N1 postcode
Trusted builders & construction firm in Islington
Extensions in Islington
Bespoke rear and side-return extensions creating stunning open-plan living in Islington's Georgian and Victorian townhouses with premium finishes.
Learn more →Loft Conversions in Islington
Exquisite mansard and dormer conversions adding luxurious additional storeys to Islington's period terraces and townhouses.
Learn more →Renovations in Islington
Comprehensive luxury renovations that restore Georgian proportions and period elegance while integrating contemporary sophistication throughout.
Learn more →Basement Conversions in Islington
Premium basement excavation adding entire floors of luxury living space beneath Islington's prestigious townhouses and period properties.
Learn more →Groundworks in Islington
Expert foundations, underpinning and structural works delivered with precision for Islington's heritage construction projects.
Learn more →Landscaping in Islington
Elegant courtyard gardens, premium paving and bespoke outdoor spaces designed to complement Islington's distinguished period properties.
Learn more →House and kitchen extensions in Islington
Islington is Georgian and Victorian terraces in Barnsbury, Canonbury and around Highbury Fields, with warehouse conversions near the canal and Victorian terraces in Holloway and Archway. Rear extensions and closet-wing infills are the typical Islington projects, along with lower-ground conversions on the Georgian terraces; garden flats add rear extensions with glazed doors.
As a guide, a well-built single-storey rear or side-return extension in Islington costs around £2,500–£4,000 per m² including structure, glazing and finishes, so a typical 25–30 m² kitchen extension lands between £75,000 and £120,000. Our house extension cost guide explains what moves the price. Barnsbury, Canonbury and Highbury Fields are among Islington's 42 conservation areas, and Islington Council has a detailed basement policy. We confirm permitted development rights at the first visit and handle any application to Islington Council through our design team, working with your architect or ours.
Planning a kitchen extension? See our kitchen extensions page for layouts, glazing and costs.
Loft conversions in Islington
Islington's terraces suit rear dormers and, on the Georgian streets, mansards; converted houses need the freeholder's agreement before roof work.
In London a Velux conversion costs £25,000–£45,000, a dormer loft with a bedroom and en-suite £45,000–£75,000 and a mansard £60,000–£100,000+; our loft conversion cost guide sets out what is included. We survey the roof structure, head height and stair position before we quote a Islington loft, so the figure reflects the actual roof rather than an assumption.
Renovations and refurbishment in Islington
Islington renovations are complete refurbishments of Georgian and Victorian houses and flats, often with structural openings and restored period detail. Typical Islington refurbishments include structural openings with steel beams, new kitchens and bathrooms, rewiring, heating and period repairs such as sash windows, cornices and floors. Our Victorian terrace renovation cost guide gives realistic budgets, and every Islington project runs on a JCT contract with a written specification and our 10-year workmanship warranty.
Guides for homes in Islington
For the period townhouses, mews and conservation areas of Islington, our most useful guides are mansard loft conversion costs, basement conversion costs, extending in a conservation area, leaking lead roof valleys and damp basements and tanking.
Planning approvals in Islington
Islington Council approved 91.0% of householder planning applications decided between September 2025 and August 2026, against a London average of 85.8%; a typical decision took about 8.3 weeks from validation. Extensions were approved 92.2% of the time.
See how every London borough compares, including loft and extension approval rates, in our 2026 London planning approvals study.
Alstruct projects near Islington
Archway Victorian Terrace, N19
Full Victorian terrace renovation and rear extension with triple glazing and aluminium sliding doors.
View project →Limehouse Cottage, E14
Underpinning, ground and first-floor extensions and a full renovation with bespoke joinery.
View project →Bow Victorian Terrace, E3
Victorian terrace: ground-floor lowering, underpinning, flat-roof extension and large roof glazing.
View project →Beyond the projects above, we have recent and current sites in N6, NW8, NW6, W11, E5 and E11 within about five miles of Islington, and we work across every London borough from our office in South Woodford, E18. See all completed projects →
Common questions about building in Islington
Do I need planning permission for an extension in Islington?
Houses, though not flats or maisonettes, keep national permitted development rights for a single-storey rear extension (3m attached, 4m detached, or 6m and 8m through prior approval) and most rear dormers within 40 cubic metres on a terrace or 50 on other houses. Islington Council has 42 conservation areas, including Barnsbury, Canonbury, Highbury Fields, Upper Street (North), Duncan Terrace/Colebrooke Row and The Angel. Inside them single-storey rear rights remain, but side extensions, two-storey rear extensions, cladding and roof additions need permission. Some conservation areas also have Article 4(2) directions, so changing front doors or windows or painting brickwork can need permission. A basement usually needs planning permission too.
What does Islington Council expect for a basement in Islington?
Islington's Basement Development SPD (January 2016) sets clear limits. A basement should cover less than half of each original garden and be smaller than the original house footprint, whichever is less. It should go no more than one storey below the lowest original floor, with a floor to ceiling height of no more than 3m. Planning permission is usually required, so the design is checked against these limits before drawings go in. In Barnsbury, the conservation area design guidelines also resist full-width rear extensions above one storey.
What does a mansard loft conversion cost in Islington?
On the Georgian and Victorian terraces of Barnsbury, Canonbury and Highbury, a mansard loft conversion typically costs £60,000–£100,000+ including VAT, with prime central schemes at £120,000–£150,000. Parapets, party walls and access through a tall house all affect the price. Our mansard loft conversion cost guide explains what is included. In Barnsbury, roof extensions visible from the street are only allowed on scheduled properties, so we check the guidelines first.
Which Alstruct projects are nearest to Islington?
Archway Victorian Terrace, N19, about 2.3 miles away, was a full Victorian terrace renovation with a rear extension, triple glazing and aluminium sliding doors. About 3.3 miles away, Limehouse Cottage, E14 involved underpinning, ground and first-floor extensions and a full renovation with bespoke joinery. Bow Victorian Terrace, E3, about 3.6 miles away, combined ground-floor lowering, underpinning, a flat-roof extension and large roof glazing.
Which parts of Islington do you cover?
We cover N1 and the wider borough: Barnsbury, Canonbury, Highbury Fields, Upper Street and the Angel, the canal-side streets, and Holloway and Archway further north. All of it is in the London Borough of Islington. We work from South Woodford E18, about 7 miles away. We also have pages for Camden, Hackney and Stoke Newington.
Nearby areas we cover
Alstruct works across every London borough. Here are areas close to Islington with dedicated local pages: