House Extension Services in London
House Extension Services in London
At Elest Group, we design and build high-quality house extensions that add space, style, and long-term value to your property. Whether you’re expanding your kitchen, creating a new living area, or adding an extra floor, our team delivers bespoke extensions tailored to your home’s architecture and lifestyle.
We manage every stage from planning and structural work to electrics, plumbing, and interior finishes ensuring your project is completed with precision, transparency, and care. Our house extension services in London are crafted to blend seamlessly with your existing property and enhance the way you live.
Design & Planning
At Elest Group, we provide complete house extension design and planning services tailored to your property. From concept drawings and 3D visuals to planning applications and structural layouts, we ensure a smooth, fully compliant process from start to finish.
Structural Works & Foundations
Our skilled builders manage all structural and foundation work, including steel installations, reinforcements, and load-bearing wall adjustments. Every element is engineered for safety, durability, and long-term stability.
Plumbing, Electrical & Heating Installation
We deliver full first-fix and second-fix services, covering plumbing, electrics, lighting, and heating systems. All work is completed by certified professionals to guarantee efficiency, comfort, and compliance.
Interior Finishes & Flooring
Our decorators and craftsmen handle every finish from plastering and painting to tiling, flooring, and bespoke joinery creating seamless results that integrate beautifully with your home’s interior style.
Exterior Detailing & Roofing
We ensure your extension blends perfectly with the existing property. From brickwork and rendering to roofing, gutters, and insulation, every detail is designed for a cohesive, lasting finish.
Project Management & Quality Control
From planning to handover, Elest Group provides dedicated project management. We coordinate all trades, maintain clear communication, and deliver each house extension on time, on budget, and to the highest standard.
House Extension FAQs – Everything You Need to Know
How much does a house extension cost in London?
A typical house extension in London starts from around £30,000 – £45,000 for a small single-storey project. Mid-range kitchen or living space extensions usually cost £50,000 – £80,000, while large or double-storey extensions can exceed £90,000. Final costs depend on size, materials, structural work, and the level of finish you choose.
How much does a bathroom renovation cost in London?
Most single-storey extensions take around 8 to 12 weeks, including construction and finishing. Larger or more complex projects – such as double-storey extensions or those requiring major structural changes – may take 12 to 20 weeks. We provide a clear schedule before work begins so you know what to expect.
Do I need planning permission for a house extension?
Many extensions fall under permitted development rights, meaning you might not need planning permission if you stay within certain size and height limits. Larger projects or homes in conservation areas usually require approval. Elest Group handles the entire planning process, including architectural drawings and building regulation submissions.
What types of house extensions do you offer?
We design and build all types of extensions, including rear extensions, side-return extensions, wrap-around extensions, kitchen extensions, and double-storey home extensions. Each project is fully tailored to your property layout, lifestyle needs, and design preferences.
Will a house extension add value to my property?
Yes – a well-designed extension can add 20–30% — and in some cases up to 40% + to your property’s market value, especially in high-demand London areas such as Chelsea, Kensington, Fulham, Hampstead, Notting Hill, St John’s Wood, West Hampstead, and Swiss Cottage. It’s one of the most cost-effective ways to increase living space, improve functionality, and significantly enhance long-term property value.
Do you provide a warranty on loft conversions?
Yes, all our loft conversions come with a 12-month workmanship warranty and full compliance with UK building regulations. We also offer continued aftercare support to ensure your new space remains in perfect condition.
Why Choose Us
🏆 Right First Time – Every Time
Our experienced renovation team delivers flawless results from the very first visit. We plan, manage, and complete every project with precision saving you time, money, and unnecessary stress.
💬 Transparent Pricing & Clear Communication
We believe luxury property refurbishment should come with complete transparency. Our quotes are clear, itemised, and upfront with no hidden costs and no unexpected changes so you’re always in control.”
🏡 12-Month Workmanship Warranty
Every project we complete is protected by a comprehensive 12-month workmanship warranty, giving you complete peace of mind and confidence in the quality and durability of our work.
⏱️ On Time & On Budget
From kitchen and bathroom renovations to full home refurbishments, we deliver projects on schedule and within the agreed budget. Our streamlined process ensures minimal disruption to your home and lifestyle.