Firtree is a family-run building company in Enfield. We build premium house extensions, loft conversions and full renovations across North London and Hertfordshire. One team from the first drawing to the day you get the keys, so nothing gets lost between design and build.
You have heard the stories. The job that ran months over. The budget that quietly doubled. The builder who stopped answering the phone. When it is your home and your money, choosing wrong is not a small mistake. It can mean months of stress and money you do not get back.
That is why we work differently. You get an itemised quote and a project schedule before any work begins, weekly updates, and one point of contact from start to finish.
Here is how we handle each of those, from the first visit onwards.
With Firtree, your extension, loft conversion or renovation is handled properly from the first conversation to the day you move back in.
Every plan starts with your family, your routines and the way you actually use the space, not a template lifted from the last job. We visit your home, listen, and draw up plans that reflect that conversation, from a rear extension to a full loft conversion.
“A partner who could bring our vision to life with precision and excellence.” Studio Manifest, Google review
An itemised quote at the start, and an honest conversation if anything shifts. No creeping extras, no vague line items. Want a rough figure first? Try our cost calculator, then we confirm an exact price after a site visit.
“They got the job done in the time estimated and also kept to the price quoted.” Nick Davidson, Google review
Clean, considered and managed daily, so neighbours stay onside and your home stays liveable while the work happens. Wondering if you can stay put? Read whether you can stay in your home during an extension.
“Polite, tidy and never left a mess.” Mark Males, Google review (loft conversion)
Materials, joinery and finishes chosen to hold their look and their value for decades, built by tradespeople who take the detail seriously. See the finish for yourself in our project gallery.
“The quality of work is excellent and Matt managed everything smoothly.” Matthew Holden, Google review
It is your biggest investment and your family’s daily routine. We take that seriously, which is why we plan carefully, communicate constantly and treat your home the way we would treat our own.
Hi, I’m Matt Carter and I run Firtree Build, a family business based in Enfield. We specialise in loft conversions, extensions, refurbishments and new builds. I’m personally involved in every project, so the standard of work and the way you’re looked after stay consistent from start to finish.
The Firtree journey
01
An unhurried visit to your home. We walk the space with you, understand what is missing and what matters, and leave you with a clear sense of what is possible.
02
You receive an itemised quote alongside drawings that reflect the conversation we had. No template plans, no guessing, no pressure to sign on the spot.
03
Weekly updates, a tidy site and one point of contact throughout. On handover day the house is finished properly, snags included.
Firtree Build is a North London building company delivering premium extensions, loft conversions, refurbishments and new builds for homeowners investing in the home they intend to stay in. We work across North London, Enfield, Hertfordshire and the parts of Essex inside the M25, handling projects from considered £100k renovations through to full homes worth up to £750k. As experienced North London builders, we manage every project end to end so you deal with one accountable team from first drawing to final handover.
What we build
Five services, one accountable team from first drawing to final handover. Choose the one closest to your project, or tell us what you have in mind.
Rear, side return, wraparound and double storey extensions that add space and light, designed around the way your home is built.
Explore extensions
Dormer, mansard and hip to gable conversions that turn unused roof space into a proper room your family will use every day.
Explore loft conversions
Kitchens, bathrooms and full refurbishments that bring a dated property back to life, room by room.
Explore refurbishments
Complete renovations managed end to end, from first fix to final decoration, with one team accountable for the result.
Explore renovations
Residential new builds delivered to a high standard, from groundworks to handover.
Explore new builds
Tell us what you have in mind and we will come back with honest advice and a clear, itemised quote after a site visit. Want a rough figure first? Try the cost calculator.
What we build
“Matt and his team built a rear ground floor extension for us in Islington. The price was competitive, Matt was quick to reply to any questions and helpful with suggestions and ideas. The quality of the work is excellent, Claud and Wojtek are highly skilled builders and we are very happy with the finish. Matt also coordinated well with other trades that were involved and the project progressed as expected. We had some minor delays as there were some complications with the piled foundations but Matt managed this well and minimised the impact on our project. I would highly recommend Firtree to anyone planning to build an extension.”
GOOGLE REVIEW
Cost calculator
Answer a few quick questions and get a guide price range for your extension, loft conversion or refurbishment. It takes about a minute.
Guide figures only, shown excluding VAT. Every home is different, so we give you a clear, itemised quote after a site visit.
FREQUENTLY ASKED QUESTIONS
North London, Enfield, Hertfordshire and Essex inside the M25.
Home renovation and extension projects from around £100k up to full homes worth about £750k.
Yes, where a project needs planning or a party wall agreement we manage it for you.
Send your project details through the contact form and we will arrange a consultation.
Advice
Practical guides to help you plan your extension or loft conversion before you pick up the phone.
Extensions
Extension ideas for a 1930s semi-detached home.
Read the guide
Loft conversions
Loft conversion ideas for a 1930s semi-detached home.
Read the guide
Planning
What to know about planning permission before you extend in Enfield.
Read the guide
Loft design
How the two most common loft conversions compare.
Read the guideMore ideas by house type: 1920s house extension ideas 1960s and 1970s house extension ideas Browse all advice
Areas we cover
Based in Enfield, we build extensions, loft conversions and renovations for homeowners across North London. Find your area below.
Elsewhere in North London? We work across the wider area too, so ask us about your postcode.
House extension builders in North London Loft conversion builders in North London
Ask about your areaReady when you are
Tell us what you have in mind and we will come back with honest advice and a clear quote.
