Builders in Hertfordshire · Stevenage & Beyond

Architecture & Building To Transform Your Home.

One Team, One Point of Contact

Luxury home extensions and personalised renovations where the flow of how your family lives comes first. As trusted builders in Hertfordshire, we manage every stage in-house, for a stress-free build, start to finish.

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Meticulous, hard working, reliable and really lovely guys”

Kathy · Bedfordshire

WHY BUILT TRUST?

More than a promise.

Anyone can say they build to a high standard. Ours is checked against a real industry standard through FMB accreditation, and backed by our 10-year workmanship promise on every job.

10-Year

Workmanship Promise

FMB

Accredited Members

WHAT WE DO

Designed Around the Way You Live

As builders in Hertfordshire, we cover everything from extensions and loft conversions to landscaping, driveways and roofing with one trusted contractor for the whole project.

We start by listening to how a space will really be used, where the mess happens, and where the light falls in the afternoon. Functional layouts and material choices come from that, not a standard template.

Home Extensions

Single & double-storey extensions that add light, space and value.

Bespoke Renovations

Full home transformations tailored to your lifestyle.

Loft Conversions

Transform unused loft space into practical, beautifully finished rooms

Outdoor Spaces

Landscaping, driveways and bespoke outdoor structures designed around your home.

ONE TEAM, START TO FINISH.

One Team, One Point of Contact.

Every project gets a knowledgeable, consistent point of contact to answer your questions promptly and make sure you're never left waiting on key decisions. Our Managing Director, Jason, has worked in the construction industry for over 15 years and oversees every project, available every working day from 8am to 4pm.

PROOF OF QUALITY

The "Built Trust" Process

We combine creative vision with practical problem-solving. Most importantly, we listen — so you get a clear, realistic price and a detailed timeline, and never second-guess the budget.

Step 1

Intelligent Design.

Cost-effective solutions without compromising on a high-end finish.

Step 2

Transparent Planning

No hidden costs or second-guessing. You receive clear timelines and honest answers.

Step 3

Precision Building

Our tight-knit team of polite professionals deliver excellence in every detail.

Budget Calculator

Plan With Confidence, Right From the Start

Wondering what your project might cost before you pick up the phone? Our quick estimate tool gives you a ballpark range in under a minute, no pressure, no obligation. It's a starting point to help you plan, and if you'd like a precise figure, we'll happily talk it through on a free home visit.

Instant Estimate

What would your extension cost?

Answer three quick questions for an instant ballpark range - built on typical Hertfordshire build costs.

What type of extension?

Single storeyGround-floor extension
Double storeyTwo-floor extension
Wrap-aroundSide + rear combined
Loft conversionInto the roof space

Roughly how big?

20 m²
A typical single-storey rear extension is around 15–25 m².
8 m²80 m²

Where’s the property?

Your ballpark range
£0 – £0

Want the full breakdown?

Pop in your details and we’ll email a fuller cost breakdown for your project — no obligation, no hard sell.

Please enter your name and a valid email.

We’ll only use your details to send your breakdown and follow up if you’d like. Unsubscribe anytime.

✓ Thanks — your breakdown is on its way.
This is an automated ballpark estimate based on typical Hertfordshire build costs and is not a quote. Real costs depend on design, specification, site conditions, planning and finish level. For an accurate, no-obligation price, book a free home visit.

Real voices

Homeowners speak about their experience

FAQs

Straight answers to the questions we hear most before a project starts. For more specific guidance, our team is always happy to help.

How do you ensure my project stays on budget and avoid "hidden costs"?

We agree an itemised, fixed proposal before work starts, covering the full scope of the project. If something changes mid-build, you'll know the cost before it's agreed, not after.

What if I’m unsure about the design?

Many clients come to us knowing how they want their home to feel, without necessarily knowing how to translate that into a finished design, and that's completely normal. We ask the right questions to draw out what matters most: how you live, what you're drawn to, what you want the space to solve, and what will feel right over time. By understanding both your practical requirements and your personal sense of style, we shape a design that feels considered, natural, and genuinely yours.

How disruptive is the build?

Any building project brings some disruption; what matters is how well it's managed. We plan each stage carefully, communicate clearly throughout, and take practical steps to protect your home, keep the site tidy, and keep disruption to a minimum.

Are your works guaranteed?

We're backed by TrustMark, the UK's only Government-endorsed quality scheme for trades carried out in and around the home. We provide a written warranty on materials and workmanship, and if a genuine issue comes to light years later, we'll return and put it right. That's the same standard we hold on every job.

Why choose Built Trust?

Because the experience matters just as much as the finished result. We combine high standards of workmanship with clear communication, thoughtful planning, and a genuinely attentive approach, so you feel informed, looked after, and confident throughout the project. For us, doing the job properly means being organised, considerate, and straightforward from start to finish.

Ready to talk through your project?

Send us a few details, or book a call with Jason directly, whichever's easier.

Extensions, renovations, and landscaping across Hertfordshire, managed by one team.

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