House Extensions

High-specification single and double-storey extensions. From structural steelwork to final handover, we deliver seamless additions designed for modern living.

Our Quotation Process

Customer Journey

GET TO KNOW BAS

We Are Committed To Delivering Premium House Extensions.

Expanding your living space requires more than just extra square footage; it demands structural integrity and seamless architectural integration. At BAS, we specialise in high-specification extensions that enhance both the value and functionality of your home. Whether you’re envisioning a contemporary glass-led sunroom or a traditional multi-storey brick addition, we bring your vision to life.

100% Satisfaction and quality workmanship guarantee.
Fully compliant with UK building regulations and planning.
Highly professional and trade-certified site staff.
Expertly managed from foundations to final handover.

From complex structural openings and RSJ installations to bespoke interior carpentry, our team ensures every phase of your extension is handled with technical precision. We coordinate all trades in-house to maintain reliable build schedules and minimize disruption to your daily life, ensuring a stress-free transformation of your property.

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WHAT REASON TO CHOOSE US

Technical Precision, Delivered Through Our Expert Trade Teams.

At BAS Building & Associated Services, we set the standard for high-specification renovations and home extensions. Our reputation is built on accountability, transparency, and a strict adherence to current UK Building Regulations, ensuring your new space is both beautiful and structurally sound.

Expert Enginers

Our certified specialists ensure seamless structural integration between your original home and your new extension.

Customer Works

Every extension is managed with a client-first approach, ensuring punctual daily starts and a clean, safe site environment.

Quality Materials

We source premium-grade bricks, glazing, and finishes that perfectly complement your property’s existing aesthetic.

Detailed Proposal

Receive a comprehensive, transparent quote with fixed pricing and a clear timeline from foundations to final handover.

Structural integrity and safety are non-negotiable for any renovation. We bridge the gap between complex engineering, like RSJ installation, and premium aesthetic finishing to ensure every project is built to a superior standard. — BAS Site Director

As part of our complete Building Services we provide:

Discover the various health services offered by our clinic and meet health solutions tailored for you.

Structural Alterations

Precision Structural Engineering

Property Refurbishments

Complete Interior Modernisation

Loft Conversions

Elevating Your Home’s Potential

House Extensions

Expanding Your Living Space

Groundworks & Foundations

Building On Solid Grounds

Garage Conversions

Functional Room Transformations

WHY CHOOSE US

The benefits of choosing Building & Associated Services

We deliver technical precision, full UK compliance, and expert project management, ensuring your structural renovations are built to last.

Detailed, transparent pricing
Comprehensive Liability Insurance
Guaranteed products and workmanship
Portfolio of project case studies
Member of The Federation of Master Builders
Professional build schedules
Every project is managed in-house
One-stop shop for building and carpentry
Dedicated Customer Relations Managers
Outstanding client testimonies and reviews
Bespoke design, manufacture, and installation

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Need to know how much your cost?

CLIENT TESTIMONIALS

Delivering Excellence
Through a Dedicated Team.

“ The team at BAS Building transformed our dated kitchen into a stunning open-plan living space. Their attention to detail, especially with the structural steelwork and glazing, was second to none. They were energetic, professional, and kept the site incredibly clean throughout the entire build. We couldn't be happier with our new home. ”

James Sterling

Homeowner, Surrey

“ I hired BAS for a complex loft conversion that required a lot of custom carpentry. Robert and his team were a breath of fresh air; they provided creative solutions to structural issues and finished the woodwork to a cabinet-maker’s standard. It’s rare to find a building company that cares this much about the fine details. ”

Sarah Jenkins

Property Developer

“ Building a house is stressful, but BAS Building made it feel manageable. Their project management is top-tier—they coordinated every trade perfectly and stayed exactly on budget. Their 'energetic team' isn't just a slogan; they truly worked with passion to get us into our home ahead of schedule. Highly recommended! ”

David Thompson

Private Client

A wide range of services.

From large-scale structural engineering to bespoke interior timber craftsmanship, BAS delivers high-specification solutions tailored to your property’s unique requirements.