Trusted Builders in Hertfordshire & North West London
Extensions, loft conversions, bathroom renovations, and complete home transformations. One team, start to finish, no subcontractor surprises.
Worried About Hiring the Wrong Builder?
Projects going over budget. Builders who disappear mid-job. Poor communication and endless delays. Subcontractors you never agreed to showing up on your property. Corners cut behind walls where you cannot see.
These are the fears every homeowner faces when investing in a major building project. And they are justified — the industry is full of sole traders with minimal insurance, no guarantees, and no accountability.
BBBrotherBuilding is different.
We are a Companies House registered limited company (#16950486) with £10 million public liability insurance, a 2-year workmanship guarantee, and a 10/10 rating on Checkatrade. We provide fixed-price quotations with no hidden costs, and our own experienced team manages your project from foundations to finish.
What We Build
Extensions
Single and double storey extensions that transform your living space.
Loft Conversions
Dormer, hip-to-gable, and mansard conversions to maximise your home.
Bathrooms
Complete bathroom renovations from design through to final finish.
Kitchens
Full kitchen fitting including plumbing, electrics, and tiling.
Our Process
Free Consultation & Site Survey
Besart visits your property to understand your vision, assess the site, and discuss your requirements in detail.
Detailed Fixed-Price Quotation
You receive a comprehensive, itemised quotation with no hidden costs. The price we quote is the price you pay.
Project Management from Foundations to Finish
One team throughout your project. No subcontractor surprises. Regular updates and meticulous attention to detail.
Final Walkthrough & 2-Year Guarantee
We walk through every detail together. Your project is backed by our 2-year workmanship guarantee and £10M insurance.
Why Choose BBBrotherBuilding
Ltd Company
Companies House registered #16950486. Full accountability and transparency.
£10M Insurance
£10 million public liability insurance. Complete peace of mind for every project.
2-Year Guarantee
Every project backed by our comprehensive 2-year workmanship guarantee.
12 Years Experience
Over a decade of delivering extensions, lofts, and renovations across Hertfordshire.
Checkatrade Verified
10/10 rating on Checkatrade. Vetted, reviewed, and trusted by homeowners.
One Team Throughout
No subcontractor chaos. Our experienced team manages your project from start to finish.
Recent Projects
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What Our Customers Say
Every review below is from a real Checkatrade customer. We don't cherry-pick — these are our most recent ratings.
Professional
Transformed our toilet, added a fantastic top-floor extension, and sorted out the garden — all while keeping the place tidy! Communication was great and price was spot on. Would definitely use again.
Job location: HA5
Excellent work from start to finish
Excellent work carried out on our property. The team handled the bathroom, tiling, loft conversion and extension, and the quality of workmanship was excellent throughout. Everything was well organised, completed as agreed, and finished to a very high standard. They were punctual, respectful, and communicated clearly from start to finish. The final result exceeded our expectations and I would not hesitate to recommend them to anyone looking for reliable and skilled builders.
Job location: NW4
House Renovation
I'm delighted with the recent renovation work on my home. The new flooring looks fantastic — neatly installed with precise finishing. Ceiling repairs have left smooth, flawless surfaces with no sign of previous issues. The painting and decorating is professional, with even application, clean edges and perfect colour choices that have brightened up every room. The work was finished on time, the site was kept tidy, and the craftsmanship is excellent.
Job location: NW4
This company is very good — I strongly recommend, 10/10
I had a whole renovation of my flat from BBBrother Building including plastering, tiles, kitchen, bathroom and electrical and plumbing work. They were very good to deal with, very understanding and hard working. Always made sure and kept me up to date with everything they were doing. I strongly recommend this company. Top job and trustworthy people. 10/10.
Job location: HA9
12 Years of Building Trust and Quality
Frequently Asked Questions
How much does a house extension cost in Hertfordshire?
Do I need planning permission for an extension or loft conversion?
How long does a typical extension or renovation take?
Are you insured and registered?
Do you use subcontractors?
Ready to Start Your Project?
Get a free site survey and fixed-price quotation. No obligation, no hidden costs.