Extensions & Annexes

At A1 Complete Builders, our Extensions & Annexes service is about adding space, functionality and value to your property with designs that flow naturally from your existing home. Whether you’re planning a kitchen extension, a sun-filled orangery, a garden room or a self-contained annexe, we focus on seamless integration—ensuring new works reflect your home’s character, proportions, materials and aesthetic.

From initial design and planning permission to foundations, roofing, joinery, plumbing, electrics and finishes, our experienced team manage every stage. We collaborate closely with you to understand how you live, work and want to use your new spaces—maximising comfort, light, accessibility and energy-efficiency. The result is an extension or annexe that feels like a natural part of your home rather than an add-on. With meticulous workmanship and attention to detail, A1 Complete Builders delivers high-quality, durable additions that enhance both lifestyle and resale value—making your vision a reality.