Extension Builders in Hatfield | Design & Build Specialists

Stay in Hatfield, just with more space. Bespoke extensions designed around your family and built to last.

5.0

14+ Google reviews

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Client reviews

Anjana Chakraborty

Very happy with Connor and Callum’s work on our home! Professional, courteous, considerate and extremely helpful was how we found Connor and his team to be. I liked the clarity of the payment schedule and the invoices. I was able to discuss with Connor any questions or concerns that I had and was grateful for the helpful suggestions. What I also really liked was that delivering what I, the client wanted, was clearly uppermost in Connor and his team’s minds. We will be contacting Connor again for any other work we want done.

Mary Peristiani

Connor and his team are great they told me exactly what the problem was where it was and what had to be done. Fantastic job will be using you again and would highly recommend these guys to do every job big or small ..

Astra Jamieson

Finished converted loft in Arnos Grove

We recently had our loft converted by The Construction Specialist , and we couldn’t be happier with the results. From the very first consultation with Connor to the final handover, the team was professional, transparent, and incredibly skilled.

They took the time to understand exactly what we wanted, provided helpful suggestions along the way, and delivered everything on schedule and within budget. The quality of workmanship is outstanding — the new space blends seamlessly with the rest of the house and feels like it was always meant to be there.

Connor kept us updated throughout, and the whole team was respectful, tidy, and hard-working. Any minor issues that came up were resolved quickly without fuss.

We now have a beautiful, big new bedroom with an ensuite bathroom that has completely transformed our home. I would highly recommend The Construction Specialist to anyone considering a loft conversion.

Buster Reynolds

I don’t often do reviews but I genuinely couldn’t be happier with how this bathroom renovation has turned out. The customer service was great, Connor and his team were really nice, in constant communication and they just did an amazing job! Couldn’t recommend them more, 10/10.

Redhead Rhys

We recently had the pleasure of working with Connor at Construction Specialist on our loft extension, and we couldn’t be happier with the results.

From the very beginning, Connor was approachable, professional, and genuinely invested in bringing our vision to life. He took the time to understand exactly what we wanted and offered thoughtful suggestions along the way that really enhanced the final outcome.

The transformation of our loft has been incredible, what was once an unused space is now a beautiful, spacious bedroom complete with a well-designed en-suite and practical attic storage. Every detail has been finished to a high standard, and the quality of workmanship is clear throughout.

Connor kept us informed at every stage of the project, was always reliable, and made what could have been a stressful process feel smooth and manageable. His attention to detail and pride in his work really stand out.

We’re absolutely delighted with our new space and would highly recommend Connor and the team to anyone considering a similar project. A genuinely great experience from start to finish.
We will definitely be contracting Connor and his team for our future builds and homw developments.

Keem Curtis

Connor and his team done amazing work at our house. They converted our garage into a play room with a 10/10 finish. We also had a major structural issue. They ripped up all flooring repaired all joists, insulated it and made sure it was fully supported with noggins. We are so happy with there work. Thanks guys

about us

Extending Your Hatfield Home

Hatfield has seen a steady rise in homeowners extending rather than relocating, keen to stay in a neighbourhood they know. Our track record — 150+ completed extensions across the region — gives Hatfield homeowners real confidence in what we can deliver. Two and a half decades in the industry, much of it spent working close to Hatfield, has shaped how we approach every new project here. Rather than starting again somewhere new, an extension lets you keep the home you know and simply give it more of what you need — space to cook, space to work, space to live. Our local knowledge of Hatfield runs deep — we understand the area’s housing stock, the planning environment, and what local council officers expect to see. Because we deal with local planning and building control teams regularly, Hatfield projects tend to avoid the delays that catch out first-time applicants. We hold every Hatfield project to the same standard, regardless of size: solid craftsmanship, honest updates, and a process you can follow every step of the way.

Our Services

Your Local One-Stop Construction Team in Hatfield

Loft Conversions

We specialize in turning empty attics into bright bedrooms. We handle all structural changes to ensure the new space feels like a natural part of your home.

Renovations & Refurbishments

Update your current rooms and improve the layout. We modernize interiors to make them more comfortable and better suited to your family lifestyle.

Home Extensions

Need more room on the ground floor? We design and build extensions that improve your living space. We manage the full build from foundations to the roof.

Roofing Services

A reliable roof is essential for any home. We provide new installations and repairs using materials that are tested to last against the British weather.

Kitchens & Bathrooms

We install functional kitchens and luxury bathrooms. Whether it is a new en-suite or a kitchen refit, we handle all the plumbing and installation work.

New Builds & Self Builds

Building a new home is straightforward with our team. We keep the project organized and on schedule, ensuring a high quality finish from the ground up.

Years of Experience

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Why choose us

Trusted Construction Partner

Hatfield Local Experts

We are a trusted company based in Barnet. Being local ensures we provide fast responses and understand Hatfield building rules perfectly.

25+ Years of Experience

With over two decades in the industry, we know how to handle complex builds. Our experience helps us work efficiently and avoid common mistakes.

Fully Managed Projects

We take care of everything for you. Planning, structural work, and final construction are all handled by our team so you have one point of contact.

Workmanship That Lasts

We take pride in our building standards. Every project is completed using quality materials, ensuring a durable result that adds value to your home.

How We Approach Extensions in Hatfield

The goal for any Hatfield project isn’t just more room, it’s a home that flows better and still looks like it belongs on the street. Achieving that comes down to three things we don’t compromise on: proper design, close project management, and consistent quality control. We begin by listening to what matters most to you, then produce clear, detailed plans showing exactly how the finished extension will look and work. We set clear expectations on logistics and timelines before work starts, and flag anything specific to your Hatfield home that might affect the build. Behind every project is a team built for the job: architects who design with intent, engineers who solve problems creatively, and tradespeople who work with precision. Quality materials and strict site safety are non-negotiable, and we take real care to protect your property while work is under way — all backed by full insurance and a written guarantee. We’ve worked with a number of repeat clients in Hatfield, families who trusted us again after seeing the results of their first project. Done well, an extension in Hatfield improves your day-to-day life and adds genuine value to your property — a return on two fronts.

Our Process

How We Get the Job Done Right

Initial Consultation

We visit your home in St Albans to look at your space. We discuss what you want to achieve and provide an honest assessment of what is possible.

Stage 1

Design and Planning

Our team creates a clear plan for the build. We coordinate the drawings and make sure the design follows all local building and safety regulations.

Stage 2

Structural Construction

Our builders carry out the work with care. We focus on the structural integrity of the build while keeping disruption to your daily routine very low.

Stage 3

Regular Project Updates

We keep you informed with regular updates. You will always know the current status of the project and what the next stages of the construction will be.

Stage 4

Final Quality Check

We perform a final inspection to ensure everything is perfect. Our work is only complete when the new space meets our high standards and your satisfaction.

Stage 5

Our portfolio

Showcasing Our Latest Building Projects in Hatfield

View examples of completed loft conversions and residential projects delivered across Hatfield, Watford, Hertfordshire, and North London.

FAQ

Frequently Asked Questions

How long does a home extension take?

Most extensions take 3-6 months depending on size and complexity. We provide detailed timelines during planning so you know exactly what to expect.

Do you handle planning permission?

Yes, we manage the entire planning process. Many extensions fall within permitted development, but we advise on all requirements specific to your property.

What does an extension cost?

Costs vary based on size and specification. We provide detailed, transparent quotes after our free consultation with no hidden costs or surprises.

Are you insured and experienced?

Absolutely. We carry full professional insurance and have 25+ years delivering high-quality residential extensions across North London and Hertfordshire.

Do you work in Hatfield?

Yes, we’re based in Barnet and serve Hatfield and surrounding areas. We have extensive experience with local properties and planning. Contact us to discuss your project.