Our extensions are designed and built with engineering precision, ensuring your property remains safe, compliant, and structurally secure while gaining valuable living space.
Structural engineering & calculations
Planning & building control compliance
Groundworks & foundations
RSJ installation
Full construction & finishing
With over 60 years of combined experience and 17,621+ completed projects, Structural Build Engineering is a trusted name for residential extensions in London.
We understand that extending your home is a major investment. That’s why our process is designed to be clear, stress-free, and fully managed.
Ideal for expanding kitchens, living areas, or creating open-plan spaces while increasing property value.
Perfect for maximising unused outdoor space and improving layout without relocating.
A combination of side and rear extensions for maximum space and design flexibility.
We assess your property, discuss your goals, and provide expert structural advice.
Our engineers prepare calculations, drawings, and assist with approvals if required.
Foundations, steel installation, and building work completed safely and efficiently.
High-quality finishes, final inspections, and full project sign-off.
Looking to extend your home in London? Our team is ready to help — from advice to execution.
Premium materials and expert workmanship throughout.
Certified engineering and full compliance guaranteed.
Design, approvals, and construction handled in-house.
Adds long-term value to London homes.
Fully insured with lasting build quality.
Built to meet all London building regulations.
All extensions must meet UK Building Regulations for safety, insulation, and structure.
Some extensions fall under permitted development; others require approval. We guide you through this.
If your extension affects a shared wall, we ensure full legal compliance.
A highly skilled team bringing decades of engineering and construction expertise to every project.
Proven results with thousands of satisfied clients across London.
From structural calculations to full property renovations — everything managed under one roof.
Professional calculations, RSJ installation, and full building regulation compliance.
Not always. Many extensions fall under permitted development, but we advise based on your property.
Most extensions take between 8–16 weeks, depending on size and complexity.
Yes. All structural engineering and RSJ calculations are handled in-house.
Absolutely. All work is fully insured and workmanship is guaranteed.
Yes. Safety is our top priority, and all work follows strict regulations.
Yes. We provide complete project management from start to finish.
Costs vary based on size and design. We provide transparent quotes after assessment.
Yes. We offer a free, no-obligation consultation.
London’s trusted specialists in certified structural engineering and full construction services. We guarantee quality workmanship, professional expertise, and transparent communication throughout every phase of your project.
