TCM Building & Maintenance has been delivering house extensions, loft conversions, refurbishments, and commercial fit-outs across Borehamwood, Hertfordshire, and North London for over 15 years. Checkatrade verified. IPAF certified. Fixed-price quotes.
One team. One contract. Every trade managed in-house from survey to handover.
Single and double-storey rear, side-return, and wrap-around extensions — designed and built by our in-house team. Typically adds 15–25% to your property value.
Dormer, Mansard, Hip-to-Gable, and Velux — transforming unused roof space into beautiful living areas.
Full house renovations managing all trades under one roof, from strip-out to final decoration.
Excavation, waterproofing, and fit-out of basement spaces to create premium habitable rooms.
Rapid response after fire or flood damage. We work directly with insurers to restore your property.
Underpinning, lintel replacement, crack stitching, and all structural remediation work.
TCM Building & Maintenance was founded on a simple principle: do the work you'd want done on your own home. Based in Borehamwood, we serve homeowners and businesses across Hertfordshire and North London — from Watford and St Albans to Barnet, Finchley, and Harrow.
Every project is managed by our in-house team of structural engineers, architects, and specialist tradespeople. You deal with one point of contact from the first survey to the day you get your keys back. No subcontractor roulette. No surprises on the final invoice.
A loft conversion is one of the most cost-effective ways to add space and value to your home — typically adding 20–25% to your property's value without losing garden space.
We understand that business downtime costs money. Our commercial team works around your schedule — including out-of-hours and weekend working — to deliver fit-outs and refurbishments that minimise disruption to your operations.
View Commercial Services"TCM transformed our Victorian terrace with a stunning rear extension. The team was professional, tidy, and finished ahead of schedule. Absolutely delighted with the result."
"We had a full loft conversion done and couldn't be happier. From planning to completion, TCM managed everything seamlessly. The quality of workmanship is exceptional."
"After a kitchen fire, TCM responded within hours and managed the entire restoration. They liaised with our insurers and returned our home to a better state than before."
Based in Borehamwood, we cover a wide area within approximately 10 miles — including Watford, Barnet, Harrow, Finchley, Hendon, St Albans, and throughout Hertfordshire.
Our home base — serving WD6 and surrounding areas.
Full building services across Watford and Cassiobury.
Extensions and loft conversions across the Barnet borough.
Covering all major towns across the county.
Stamp duty, agent fees, and removal costs can add £30,000–£40,000 to the cost of moving. Find out whether extending makes more financial sense.
Read article
Insurance certificates, company registration, payment schedules, and seven red flags that filter out unsuitable contractors before you commit.
Read article
The type that works best depends on your roof structure, space needs, budget, and planning rules. All four main types compared with costs.
Read articleFill in the short form and we'll get back to you within one working day with a no-obligation estimate. No call centres — you'll speak directly with our team.
Burst pipes, structural damage, fire or flood — our emergency team is available around the clock to secure and restore your property.
