Architectural Ambition for Your Growing Home
A home extension is more than just adding square footage; it’s about evolution. At Built Trust, we specialise in luxury extensions that don't just "attach" to your house—they transform it. Based in Stevenage and serving Hertfordshire, we create seamless, sun-drenched spaces designed to support your family’s unique rhythm.
We bring architectural precision to a variety of extension styles:
Perfect for adding new bedrooms or expansive master suites.
Ideal for creating the open-plan kitchen-diner of your dreams.
Incorporating floor-to-ceiling glass and intelligent lighting schemes.
Removing internal walls to ensure your new extension flows naturally into your existing home.

We believe a luxury extension should be a seamless evolution of your home, not a source of stress. Our experience is defined by empathetic listening, where we prioritise your family’s unique rhythm to ensure you feel heard and in control from day one. By combining total financial transparency with realistic timelines, we eliminate the uncertainty of hidden costs. Every project is delivered by a trusted, professional team and backed by a 10-year workmanship warranty, ensuring your new space is built on a foundation of absolute security.
The Federation of Master Builders (FMB) Membership is earned through a vetting and inspection process, making it a recognised mark of quality, professionalism, and commitment to proper standards. For homeowners, it offers added reassurance that they are working with a builder who takes both workmanship and client care seriously.
Customer Satisfaction
Project Transparency
Professionalism
Customer Satisfaction
Project Transparency
Professionalism
In line with our pragmatic and professional approach, we manage every technical detail to move you from planning to completion with ease:
We evaluate your property’s potential and coordinate with architects to ensure the design meets both aesthetic ambition and practical function.
A dedicated lead ensures our team stays on schedule, maintaining a clean and respectful site that minimises disruption to your world.
We conduct a final, comprehensive quality check before handing over the keys to a new sanctuary that is perfectly suited to your lifestyle.
Homeowners speak about their experience
Stop hoping for more space and start building it with a partner you can trust.
To the right, we have addressed the most common questions regarding our luxury extension process. If you require further technical details, our team is always ready to provide the honest answers you deserve.
It depends on the type of project and how much of your home is being affected. Some extensions can be managed while you remain living in the property, while others are more practical if you move out for part of the build. We will always give you an honest view based on the works involved.
We take time to understand the character of your home and the details that give it its identity. By considering materials, proportions, and the way old and new spaces meet, we help ensure the extension feels balanced, cohesive, and thoughtfully resolved.
Yes, we will happily help you with acquiring planning permission and building regs upon request. We’ll explain the sequence and the timelines for submitting planning so it feels clear, organised and properly handled.
If something unexpected is uncovered, we deal with it calmly and properly. We will explain the issue clearly, talk you through the available options, and involve the appropriate structural professional where needed before any decision is made. The priority is always to resolve matters safely, correctly, and with as little disruption to the wider project as possible.
Our work is supported by a written warranty on materials and workmanship, and we will always be clear about any longer-term guarantees attached to structural components or specialist systems. Clarity matters, especially when it comes to what sits behind the finished work.
25 Town Square Stevenage SG11BP