Premium Builders in Croydon
Premium house extensions, renovations and loft conversions in Croydon, London.
Expert Construction Services in Croydon, CR0
Croydon is one of South London's largest and most diverse boroughs, experiencing a significant wave of regeneration that is transforming the area into an increasingly desirable residential destination. The borough's housing stock spans handsome Victorian terraces in areas like South Norwood and Thornton Heath, elegant Edwardian semi-detached homes across Purley and Sanderstead, and substantial interwar properties throughout the wider CR0 postcode. Alstruct Ltd delivers premium construction services across Croydon, helping homeowners enhance their properties and capitalise on the area's growing appeal.
Croydon's varied housing stock offers excellent opportunities for every type of home improvement. Victorian terraces benefit enormously from rear and side return extensions that create the open-plan kitchen-living spaces modern families desire, while Edwardian semis often have the plot width for impressive two-storey side extensions. The area's interwar and post-war properties typically feature generous gardens and solid construction that support ambitious wraparound extensions and contemporary additions. Loft conversions are popular across all property types, with Croydon's relatively affordable entry prices meaning that well-executed construction work delivers outstanding returns on investment.
The London Borough of Croydon has its own planning framework with specific local policies covering extensions, conversions and new development. Parts of the borough include conservation areas and areas of special local character where additional design controls apply. Croydon Council has been proactive in supporting quality residential improvement as part of the borough's wider regeneration agenda. Alstruct's in-house design team prepares applications to Croydon's planning department that align with local policy.
Why Choose Alstruct in Croydon?
- Experience across Victorian, Edwardian and interwar property types
- Thorough knowledge of Croydon Council planning policies
- CHAS Elite, Constructionline Gold & FMB accredited
- Complimentary site survey and design consultation
- Dedicated project manager for every build
- Competitive pricing with premium quality construction
- Transparent, fully itemised quotations with no hidden costs
- Published case studies with scope, programme and budget
Frequently Asked Questions — Croydon
How much does a house extension cost in Croydon?
The cost of an extension in Croydon depends on its size, the specification and the structural work involved. Our London cost guide puts a single-storey rear extension at £80,000–£110,000 at mid specification and £120,000–£160,000 at high specification, and a double-storey rear extension at £170,000–£230,000 and £240,000–£320,000. Build rates run from £2,500–£3,200/m² at mid-range specification to £3,200–£4,500/m² at high specification. Alstruct provides a fixed, itemised quotation after a site visit; our house extension cost guide explains what moves the price.
Can I extend under permitted development in Croydon?
Many extensions in Croydon qualify under Permitted Development rights. Single-storey rear extensions of up to 3 metres (terraced/semi) or 4 metres (detached) can often proceed without a full planning application. Larger extensions may qualify under the prior approval process. Alstruct will assess your specific PD entitlement and manage any applications with Croydon Council.
Are loft conversions worth the investment in Croydon?
Absolutely. Loft conversions in Croydon typically add 15-20% to a property's value, making them one of the most cost-effective home improvements. With Croydon's property market strengthening through regeneration, this represents excellent return on investment. Dormer and hip-to-gable conversions are popular across the borough's varied housing stock.
Does Croydon's regeneration affect planning applications?
Croydon Council has been broadly supportive of quality residential improvement as part of the borough's regeneration strategy. However, specific policies apply in different areas, and conservation zones have additional controls. Alstruct stays up to date with Croydon's evolving planning policies and advises clients on how best to position their applications for approval.
Construction Services in Croydon
Extensions in Croydon
Rear, side and wraparound extensions for Croydon's Victorian terraces, Edwardian semis and interwar homes, creating spacious modern living areas.
Learn more →Loft Conversions in Croydon
Dormer, hip-to-gable and mansard loft conversions adding valuable bedrooms and bathrooms across Croydon's diverse housing stock.
Learn more →Renovations in Croydon
Complete property refurbishments modernising Croydon's period and interwar homes with open-plan layouts, premium kitchens and luxury bathrooms.
Learn more →Basement Conversions in Croydon
Expert basement excavation and conversion creating additional living space beneath Croydon's period properties.
Learn more →Groundworks in Croydon
Professional foundations, underpinning and drainage solutions for extensions and new construction projects across Croydon.
Learn more →Landscaping in Croydon
Premium driveways, patios, garden walls and outdoor spaces designed to complement Croydon's residential properties and gardens.
Learn more →House and kitchen extensions in Croydon
Croydon's housing is Victorian terraces around the town centre and Addiscombe, Edwardian houses in South Croydon and Purley Oaks, and large numbers of 1930s semis in Shirley and Selsdon. Rear and wraparound extensions on the terraces and wide rear extensions on the semis are the typical Croydon projects, usually creating a kitchen-family room; two-storey side extensions are common in Shirley.
As a guide, a well-built single-storey rear or side-return extension in Croydon 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. Croydon Council permits most single-storey extensions under permitted development; conservation areas include Addiscombe's Havelock Road, Central Croydon and parts of South Croydon. We confirm permitted development rights at the first visit and handle any application to Croydon Council through our in-house design team.
Planning a kitchen extension? See our kitchen extensions page for layouts, glazing and costs.
Loft conversions in Croydon
Hip-to-gable with a rear dormer suits the Croydon semis and gives a master suite; the Victorian terraces take a rear dormer with a bathroom under the ridge.
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 Croydon loft, so the figure reflects the actual roof rather than an assumption.
Renovations and refurbishment in Croydon
Croydon renovations are often whole-house updates of interwar semis and refurbishments of Victorian terraces with new services, kitchens and bathrooms. Typical Croydon 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 Croydon project runs on a JCT contract with a written specification and our 10-year workmanship warranty.
Planning approvals in Croydon
Croydon Council approved 85.1% of householder planning applications decided between September 2025 and August 2026, against a London average of 85.8%; a typical decision took about 7.9 weeks from validation. Loft conversions that needed planning permission were approved 77.6% of the time and extensions 85.8%.
See how every London borough compares, including loft and extension approval rates, in our 2026 London planning approvals study.
Recent Alstruct projects across London
Limehouse Cottage, E14
Underpinning, ground and first-floor extensions and a full renovation with bespoke joinery.
View project →Lyal Road, Bow E3
Victorian terrace: ground-floor lowering, underpinning, flat-roof extension and large roof glazing.
View project →Keogh Road, Stratford E15
Zinc-clad loft conversions, kitchens, bathrooms and structural works on two Victorian terraces.
View project →Beyond the projects above, we have recent and current sites in SW19 within about five miles of Croydon, and we work across every London borough from our office in South Woodford, E18. See all completed projects →
Common questions about building in Croydon
Do Alstruct cover Croydon?
Yes. Alstruct takes on extensions, renovations and loft conversions in Croydon and the surrounding neighbourhoods, working across every London borough from our office in South Woodford, E18. We visit, measure and provide a written, fixed-price quote.
How much does a house extension cost in Croydon?
As a guide, our published London figures at mid to high specification are £80,000–£160,000 for a single-storey rear extension, £65,000–£130,000 for a side return, £170,000–£320,000 for a double-storey and £190,000–£380,000 for a wrap-around. 1930s semis and victorian terraces are the most common build type in the area, and our quote will reflect the specific condition and layout of the property. Our house extension cost guide sets out what those figures include.
Do I need planning permission for an extension in Croydon?
Many single-storey rear extensions in Croydon fall under Permitted Development rights and don't require planning permission, but larger or two-storey extensions usually need approval from Croydon Council. We assess this during the free consultation and prepare any application required.
What types of property do you work on in Croydon?
1930s semis and Victorian terraces are the most common homes in Croydon. We survey the structure, check the planning and building regulations position and price from what we find, so the quote reflects your property rather than an assumption. Our completed projects show the Victorian and 1930s houses we have extended and refurbished across London.
How quickly can Alstruct start a project in Croydon?
Once design and approvals are signed off, we typically start on site in Croydon within 6–12 weeks depending on programme availability. Design, planning and building regulations typically take 3–6 months before that. For urgent projects, get in touch on 020 8080 8240 to discuss timing.
Are you accredited to work in Croydon?
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 Croydon.
Nearby areas we cover
Alstruct works across every London borough. Here are areas close to Croydon with dedicated local pages: