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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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Why Choose Us

40 Years Experience
Rely on our seasoned expertise. Your vision, our commitment - a legacy built on precision and satisfaction.
7 Days a Week
We’re here when you need us, offering flexible and reliable service every day of the week.
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.

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


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