Double Storey Extensions
Double Storey Extension Builders in Cambridgeshire & Hertfordshire.
TrustMark Approved
Creating exceptional multi-level living spaces.
At CB Building Services, we specialise in double storey extensions that dramatically transform your home by adding substantial space on both ground and first floors. Based in Royston, we’ve transformed hundreds of homes across Cambridgeshire and Hertfordshire. Whether you’re creating a contemporary glass-walled space or a traditional brick extension that complements your home’s period character, we deliver exceptional craftsmanship at every level.
Why choose us
Trusted expert builders
- Members of the Federation of Master Builders
- Our accreditations include Gas Safe registration and NICEIC certification.
- TrustMark Approved
- Government-endorsed contractor, we’re committed to quality, reliability, and consumer protection.
- No outsourcing
- The same team that quotes your project will see it through to completion.
- From build to finish
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From constructing your extension to fitting units, plumbing and electrics.
What we do
From substantial family extensions to impressive architectural statements.
We create every style of double storey extension, from practical rear additions that provide kitchen-dining space below and bedrooms above, to impressive wrap-around designs that completely transform your home’s footprint. Whether you’re looking to create a master bedroom with ensuite, expand your family accommodation or add a home office with guest bedroom above, we bring meticulous attention to detail and craftsmanship to every level of your project.
- Maximum space gain
- Enhanced property value
- Rear extensions
- Side return extensions
- Wrap-around extensions
- Master suite extensions
“CB Building Services completed our extension to a high standard as required, on timescale and on budget. Thoroughly recommended. Thanks Charlie and the team.”
How we work
Your double storey extension journey from ambitious vision to completion.
We handle every aspect of your double storey project, from structural engineering and foundation design through to interior finishes across both floors, ensuring your new two-level space integrates perfectly with your existing home’s layout and architectural style. We coordinate all trades across both construction levels, maintain clear communication throughout the extended build process and pay particular attention to complex structural elements, waterproofing and thermal efficiency.
Helpful advice & latest work
Discover our latest projects and read helpful tips about extending your home.
Blog
Advice for UK homeowners looking to extend and renovate their property.
Double-Storey Transformation
A stunning extension featuring an open-plan kitchen with bifold doors and two spacious bedrooms
Seamless Summer Extension
A flawlessly executed project delivered on time, on budget and with exceptional build quality.
Trusted double storey extension specialists
Your double storey extension represents a major investment in your home’s future, which is why we maintain the highest professional standards throughout every stage of this complex construction process. As TrustMark approved contractors and proud members of the Federation of Master Builders, we’re recognised for our commitment to quality workmanship, structural integrity and complete customer satisfaction across multi-level builds.
Ready to transform your home?
Contact CB Building Services today for a consultation about your double storey extension project. Let’s create exceptional multi-level accommodation that enhances how your family lives both now and in the future.