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Custom Home Extensions | Expertly Crafted to Enhance Your Space

We create custom home extensions that blend seamlessly with your space, enhancing both functionality and style. At SLL Building Co., our expert team delivers tailored solutions with innovative design and craftsmanship, providing exceptional quality across London and beyond.

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City And Guilds
Federation of Master Builders
Trustmark Government Endorsed Quality

Get a free quote for your home extension and let our expert team bring your vision to life. From concept to completion, we provide clear communication, quality craftsmanship, and a seamless experience tailored to your needs.

0208 087 1923

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Why Choose Us

Luxury Kitchen

40 Years Experience

Rely on our seasoned expertise. Your vision, our commitment - a legacy built on precision and satisfaction.


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7 Days a Week

We’re here when you need us, offering flexible and reliable service every day of the week.


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Reliable & Credible


Trust in our reputation for delivering exceptional results, every time.​​


Free Quotes & Consultations

No pressure, just expert advice. Get a free quote and consultation to start your project with confidence.
 

Side, Rear & Wraparound

Enhance your home with a tailored extension that adds space and style. Whether side, rear, or wraparound, we design seamless additions that elevate how you live and feel at home.

Garden Rooms

Add flexible space with a beautifully designed garden room. Ideal for home offices, studios, or relaxing retreats, each build is custom-crafted to blend with your lifestyle and landscape.

Garage Conversions

Transform your garage into a fully functional part of your home. From living spaces to hobby rooms, we deliver high-quality conversions that maximise space and comfort.

Loft Conversions

Elevate your home with a light-filled loft conversion designed around your needs. We create bright, practical spaces that add value and feel like a natural extension of your home.

Basement Construction

Create a brand-new basement tailored to your needs. Whether for work, guests, or play, we construct high-quality, functional spaces with expert craftsmanship and attention to detail.

Foundation & Groundwork

Lay the groundwork for a successful build with expert foundation services. We handle every stage with precision, ensuring your project starts strong and stands the test of time.

Workers in Building Site

Wraparound Extension – Sarah L.

(Wimbledon, London)​​​

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We had a wraparound extension done on our Victorian semi, and we couldn’t be happier with the result. From planning permission to final finishes, everything was handled professionally and on time. The team was tidy, polite, and always communicative. Our kitchen and dining space are now bright, open, and exactly what we imagined. Highly recommend for anyone considering a home extension.

HMO Conversion – James K. (Croydon)

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I hired a team for a full HMO conversion of a 5-bedroom house, and they delivered beyond expectations. They handled the project end-to-end — fire regulations, soundproofing, en-suites, and even the planning with the council. What impressed me most was their understanding of compliance and investment returns. The work was high quality and completed within budget. As a landlord, finding a reliable team like this is gold.

Basement, Loft & Rear Extension – Priya D. (Dulwich Village, South London)

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We undertook a major renovation — basement dig, loft conversion, rear extension, and a full-house refurb. A huge project! The project manager kept everything on track and transparent. We lived off-site during the work, but they sent regular updates and even helped with finishes selection. The craftsmanship is excellent, and the house feels brand new but still full of character. We’ve had so many compliments.

Client Feedback



We take pride in delivering top-tier property maintenance services to clients throughout London.




 

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