Trusted Builders in Hertfordshire & North West London

Extensions, loft conversions, bathroom renovations, and complete home transformations. One team, start to finish, no subcontractor surprises.

Get a Free QuoteCall 07925 921 222
Completed house extension with roof and brickwork by BBBrotherBuilding in Hertfordshire
★★★★★10/10 on CheckatradeLtd Company #16950486£10M Insured2-Year Guarantee12 Years Experience

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 by BBBrotherBuilding

Extensions

Single and double storey extensions that transform your living space.

Loft Conversions by BBBrotherBuilding

Loft Conversions

Dormer, hip-to-gable, and mansard conversions to maximise your home.

Bathrooms by BBBrotherBuilding

Bathrooms

Complete bathroom renovations from design through to final finish.

Kitchens by BBBrotherBuilding

Kitchens

Full kitchen fitting including plumbing, electrics, and tiling.

Our Process

01

Free Consultation & Site Survey

Besart visits your property to understand your vision, assess the site, and discuss your requirements in detail.

02

Detailed Fixed-Price Quotation

You receive a comprehensive, itemised quotation with no hidden costs. The price we quote is the price you pay.

03

Project Management from Foundations to Finish

One team throughout your project. No subcontractor surprises. Regular updates and meticulous attention to detail.

04

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

View All
Extension brickwork with window frames fitted
Completed kitchen with island and marble flooring
Completed bathroom renovation with tiling
Completed block paving driveway
Plastered living room with skylight
Extension with completed roof and guttering
“
BBBrotherBuilding transformed our home beyond our wildest expectations. Their attention to detail and project management made the entire process stress-free.

Checkatrade Verified Review

10/10 on Checkatrade

Read all reviews on Checkatrade

12 Years of Building Trust and Quality

12+Years Exp.
10/10Checkatrade Rating
£10MInsurance Cover
2yrGuarantee

Areas We Cover

Based in Borehamwood, Hertfordshire — serving Hertfordshire & North West London

St AlbansWatfordEdgwareStanmoreBarnetHarrowWembleyWood Green

Frequently Asked Questions

How much does a house extension cost in Hertfordshire?
Extension costs vary depending on size, complexity, and specification. A single-storey rear extension typically ranges from £30,000 to £50,000, while double-storey extensions range from £45,000 to £75,000. We provide free site surveys and detailed fixed-price quotations with no hidden costs.
Do I need planning permission for an extension or loft conversion?
Many extensions and loft conversions fall under permitted development rights and do not require planning permission. However, this depends on the size, position, and your property type. We assess planning requirements during your free consultation and handle all applications if needed.
How long does a typical extension or renovation take?
A single-storey extension typically takes 10-14 weeks from foundations to completion. Loft conversions usually take 8-12 weeks. Bathroom renovations take 2-4 weeks. We provide a detailed project timeline in your quotation and keep you updated throughout.
Are you insured and registered?
Yes. BBBrotherBuilding Ltd is a Companies House registered limited company (#16950486) with £10 million public liability insurance. We are Checkatrade verified with a 10/10 rating. All our work comes with a 2-year workmanship guarantee.
Do you use subcontractors?
No. One of our key differentiators is that we use our own experienced team from start to finish. You will not have different tradespeople appearing unannounced. Besart personally manages every project, ensuring consistent quality and clear communication throughout.

Ready to Start Your Project?

Get a free site survey and fixed-price quotation. No obligation, no hidden costs.

Get a Free QuoteCall 07925 921 222
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