DESIGN. PLAN. BUILD. TRANSFORM.
Expert advice.
Exceptional results.
Loft conversions, extensions, renovations and structural solutions across Hertfordshire.
WHAT DO YOU WANT TO DO?
Let's find the right solution for your home.
Extensions & Additional Spaces
Garden Office
A purpose-built garden office, documented from the first groundworks to a finished workspace with timber cladding and decking.
GUIDES, GROUNDING & A SPECIALIST NEXT DOOR
Advice worth reading, and where else to look.
GUIDES & ADVICE
Knowledge centre
Planning your next project
Explore our approach to planning building work and the questions to consider before getting started.
Explore the Planning Hub →
ABOUT 4DMC
Who we are
Built on experience. Focused on you.
Two decades delivering construction and structural work across Hertfordshire.
About us →
SISTER COMPANY
4DKB
Kitchens & bathrooms, specialised.
Design, supply and installation from our specialist sister company.
Visit 4DKB.co.uk →
TESTIMONIALS
“... stayed in touch with good communication ...”