Loft Conversion Builders in London & Surrey
Choosing the right builder is essential to a successful loft conversion. At Alkemist Build and Decorate, we specialise in the construction of loft conversions, delivering precise, high-quality structural work in full compliance with UK building regulations and safety standards.
Working from approved plans, we collaborate with architects and engineers to ensure every project is built accurately, efficiently, and to the highest standard.

Our Loft Conversion Build Services
We provide professional construction services for all major types of loft conversions, including:
Dormer Loft Conversions
The most popular option in London, dormer conversions provide additional headroom and usable floor space. Our team ensures strong structural integration and a seamless finish that complements your property.
Mansard Loft Conversions
Ideal for maximising space in urban properties, mansard conversions require precise structural work. We deliver clean, high-quality builds that meet planning and structural requirements.
Hip-to-Gable Conversions
Perfect for semi-detached and end-of-terrace homes, this type of conversion increases internal space significantly. We carry out all structural alterations safely and efficiently.
Velux (Rooflight) Conversions
A cost-effective option that transforms your loft without major structural changes. We install roof windows, reinforce flooring, and complete all internal works to a high standard.
Built to the Highest Standards
As a dedicated building company, we pride ourselves on delivering:
- High-quality structural work
- Full compliance with UK building regulations
- Safe and efficient construction practices
- Clean and organised worksites
- Clear communication throughout the project
We understand that having work done in your home can be disruptive, which is why we aim to complete every project on time, on budget, and with minimal inconvenience.
Our Build Process
We keep things straightforward and transparent:
1. Project Review
We assess your drawings, specifications, and structural requirements.
2. Planning & Preparation
We coordinate materials, timelines, and construction phases.
3. Construction Phase
Our skilled builders carry out all structural work, insulation, roofing, flooring, and internal construction.
4. Final Completion
We ensure all work is completed to specification and ready for final sign-off.
Ready to Start Your Loft Conversion?
Planning a loft conversion in London or Surrey? Work with experienced builders who deliver high-quality, regulation-compliant builds from approved plans.