Quality building work for homes that need more space.
Carter & Sons Building Co. delivers extensions, renovations and structural building work across St Albans and Hertfordshire.
Based in St Albans · Working across Hertfordshire
Building work for homes that are ready to change.
Our focus is larger residential work—not handyman jobs or patch repairs. Each project is carefully scoped, sequenced and managed.
House extensions
Single- and double-storey extensions, from groundwork and structural work through to coordinated finishing.
Explore serviceHome renovations
Full and partial renovations for dated homes that need a properly managed upgrade.
Explore serviceGarage conversions
Practical new rooms planned around insulation, access, electrics and a tidy finish.
Explore serviceStructural alterations
Wall removals, steel installations and knock-throughs from structural calculations to finished space.
Explore service
A properly managed build starts with a clear plan.
Dan Carter remains your main point of contact while the team organises each stage, coordinates trusted specialists and keeps you informed.
- 01Discuss the project
- 02Visit and quotation
- 03Plan and coordinate
- 04Build and complete
Selected work across Hertfordshire.
View all projects
St AlbansRear extension
A brighter kitchen and dining space with improved garden access.
View project
HarpendenGarage conversion
An underused garage transformed into a practical year-round office.
View project
RadlettKitchen knock-through
Two rooms opened into one larger family space.
View projectExtensions and renovations are considered across Hertfordshire, usually within 25 miles of St Albans.
Areas covered
Trusted for the way we manage the work.
“Dan and the team built our rear extension and were excellent from start to finish. Communication was clear and the workmanship was first class.
Rebecca M. · House extension · St Albans
“The site was kept tidy and the end result is exactly what we wanted.”
Tom H. · Structural alteration
“Reliable, professional and easy to work with.”
A. Patel · Renovation
Family-run. Organised. Focused on the finish.
Carter & Sons Building Co. grew from family trade experience and repeat local recommendations. Our five-person core team works with trusted electricians, plumbers, roofers and plasterers where required.
Dan Carter oversees quotations, planning and progress on site, giving customers one main point of contact throughout.
Meet the team
Planning a larger home project?
Tell us what you are considering, where the property is and whether drawings or planning are already in place.