House Extensions · Stevenage

House Extensions in Stevenage

Fast, highly insulated house extensions—professionally managed from start to finish for homes we serve across Stevenage.

Call Now for a Free Quote01727 224616

White rendered single-storey rear house extension with grey patio and bi-fold doors in Hertfordshire

Brick single-storey rear extension with Crittall-style glazing and a cottage garden

Red-brick single-storey rear extension with anthracite sliding doors and patio in Harpenden

0% finance available*

*subject to terms

Fast 3–5 week extensions
Professional project management
Family-owned, 20+ years
Highly insulated builds
5-star customer satisfaction

Trusted house extension builders serving Stevenage

The Home Extension Company delivers high-quality house extensions for homeowners across Stevenage, combining fast, specialist build methods with meticulous craftsmanship for a seamless result that feels like it has always been part of your home. From the first consultation to final handover, every project is professionally project managed—coordinating all trades, keeping timelines clear, and communicating consistently to minimise disruption and keep you fully informed. As a family-owned company with over 20 years of experience, the team is known for a personal, honest approach built on reliability and trust. Each extension is constructed with premium materials and highly insulated designs for year-round comfort and strong energy efficiency, backed by a 5-star service standard focused on delivering a smooth, customer-first building experience.

Open-plan house extension in Stevenage with grey porcelain floor tiles, a roof skylight and anthracite bi-fold doors

10-Year Structural Guarantee

25-Year Roof Guarantee

5.0 rating

Loved by homeowners across Hertfordshire

Read genuine five-star reviews from our recent house extension customers.

5 Aug 2026

Second project with the team and once again faultless. Professional, tidy and finished on schedule. Highly recommended.

Oliver Hayes

3 Apr 2026

We cannot praise the company highly enough. Our extension was completed quickly, yet there was no sense that the work had been rushed. The quality and attention to detail are excellent, the finished space looks beautiful, and it stays exceptionally warm.

Ananya Kapoor

15 Mar 2026

The team organised everything, kept the project progressing and finished the entire extension in under six weeks. The completed room looks superb and has transformed our home. We have also been impressed by how well insulated it is.

Rohan Mehta

24 Feb 2026

Choosing a company to build an extension is a major decision, but we are extremely pleased that we chose this team. The build was completed quickly, and the quality of the finished extension is excellent. The service was friendly and professional throughout.

Priya Sharma

5 Feb 2026

We recently had our house extension completed by this company and could not be more pleased with the result. The entire extension was completed in under four weeks, which was far quicker than we had expected. Despite the speed, the finished quality is excellent.

Arjun Patel

17 Jan 2026

We received a professional service throughout the project. The team managed the complete build, worked efficiently and delivered our extension quickly. The result is an attractive and well-insulated addition that feels fully integrated with our home.

Linh Nguyen

30 Dec 2025

Absolutely over the moon with our extension! It looks great, stays really warm and was finished much quicker than we thought possible. The team sorted everything out and made the whole experience easy for us.

Kenji Tanaka

11 Dec 2025

The quality of the craftsmanship is clear throughout our new extension. Every part looks carefully finished, and the room is noticeably warm and comfortable. Delivering this standard of work so quickly was very impressive.

Hannah Kim

23 Nov 2025

The extension has transformed our house and given us a room we genuinely love spending time in. It is bright, comfortable and warm, and the finish is excellent. Seeing it completed so quickly was remarkable.

Wei Chen

4 Nov 2025

The entire build was well organised and completed promptly. Communication and service were good throughout, and the finished extension feels solid, warm and built to a high standard. We're very pleased with our decision.

Sophie Dubois

16 Oct 2025

Several people have already commented on how good our extension looks. We're extremely pleased with the result and wouldn't hesitate to recommend the company to friends, family or neighbours.

Camille Laurent

28 Sep 2025

An outstanding job from a genuinely professional team. We love the finished extension.

Julien Moreau

9 Sep 2025

It was reassuring to work with a company that took responsibility for the whole process. They were professional, dependable and clearly took pride in their work. Our completed extension is warm, attractive and extremely well finished.

Piotr Zieliński

21 Aug 2025

We were surprised by how quickly and smoothly everything came together. The team handled the complete project and kept the disruption to a minimum. In no time at all, the extension was finished and ready for us to enjoy.

Katarzyna Nowak

2 Aug 2025

A huge thank you to the whole team for doing such a wonderful job on our extension. It was completed impressively quickly, and we are delighted with the quality, warmth and appearance of the finished room.

Jakub Kowalski

14 Jul 2025

Fast, professional and reliable. The team delivered everything they promised, and our new extension looks absolutely fantastic.

Elena Castillo

26 Jun 2025

Our new extension has completely changed the way we use our home. It has given us a beautiful, warm additional living space, and the team managed to complete the entire build quickly.

Carlos Romero

7 Jun 2025

The project management was excellent. Everything was organised properly, the different stages ran smoothly and we always felt that the job was under control. The extension was completed quickly and looks superb.

Lucía Navarro

20 May 2025

From the initial conversations through to completion, the service was excellent. The team took responsibility for everything and made sure the project progressed smoothly. Before long, we had a beautiful, warm and professionally finished extension.

Javier Morales

1 May 2025

If you're considering having an extension built, I'd definitely recommend this team. They made the process simple, did what they promised and finished ours quickly.

Benjamin Cooper

12 Apr 2025

The finished extension has exceeded our expectations. It looks fantastic, feels warm even in colder weather and blends beautifully with the rest of our home.

Grace Palmer

24 Mar 2025

We are delighted with the standard of our completed house extension. The project was professionally managed, efficiently delivered and completed within four weeks. The finished space is attractive, comfortable and exceptionally well insulated.

Samuel Webb

5 Mar 2025

We're so happy we chose this company. They handled the whole job, finished ahead of our expectations and gave us a beautiful new extension that we can enjoy throughout the year.

Eleanor Clarke

15 Feb 2025

A rare combination of speed and quality. The team completed our extension quickly without sacrificing the finish. The result is a warm, attractive and practical addition to our home.

Jack Richardson

28 Jan 2025

I don't normally write reviews, but the team deserves recognition for the work they have done. Our extension looks brilliant, stays lovely and warm, and was finished ahead of schedule.

Amelia Brooks

9 Jan 2025

Having an extension built can feel daunting, but the team made everything surprisingly easy. They managed the entire project, kept everything moving and completed it ahead of schedule.

William Turner

23 Dec 2024

Five-star service throughout. The extension was completed incredibly quickly, the workmanship was excellent and the finished room looks amazing. Thank you to everyone involved.

Rebecca Dawson

6 Dec 2024

The team built our house extension in under six weeks and we are very happy with it. It is warm, well finished and has given us exactly the additional space we needed.

George Foster

18 Nov 2024

I would happily recommend this company to anyone considering a house extension. They provided an excellent service, managed everything and delivered a great result.

Lucy Harrison

30 Oct 2024

We have been extremely impressed by how warm and comfortable our new extension is. It feels like a natural part of the house and looks fantastic too.

Thomas Bradley

11 Oct 2024

What an amazing transformation! The extension looks even better than we imagined, and the whole project was completed remarkably quickly.

Hannah Fletcher

23 Sep 2024

A professional, efficient and well-managed service from start to finish. Our extension was completed quickly, looks excellent and remains wonderfully warm.

Matthew Parker

2 Sep 2024

Really pleased with the extension. The team did a great job, finished it promptly and took care of everything along the way.

Charlotte Collins

8 Aug 2024

The company handled everything for us, making the entire process straightforward and stress-free. We couldn't be happier with the finished extension.

Oliver Hayes

19 Jul 2024

Our house extension was completed in under four weeks, which was genuinely impressive. The quality certainly wasn't compromised either, and it looks brilliant.

Emily Carter

27 Jun 2024

We absolutely love our new extension. It looks beautiful, feels incredibly warm and was completed much faster than we expected.

James Whitmore

3 Jun 2024

Excellent service from beginning to end. Our new extension looks fantastic.

Sophie Bennett

14 May 2024

Brilliant extension, completed quickly and beautifully finished.

Daniel Harper

Start your Stevenage extension today

Let’s plan your extension today—get in touch for a consultation and we’ll give you clear timelines, coordinated trades, and a smooth, low-disruption build.

Get a free quote 01727 224616

Recent work

House extensions we've built in Stevenage

Brick single-storey extension in Harpenden — Brick single-storey extension
Harpenden

Modern porch with an anthracite glazed door in Hertfordshire — Modern porch with an anthracite glazed door
Hertfordshire

Wrap-around extension with corner bi-fold doors in Hertford — Wrap-around extension with corner bi-fold doors
Hertford

Compact single-storey extension with French doors in Hitchin — Compact single-storey extension with French doors
Hitchin

White render porch with black corner windows in Hertfordshire — White render porch with black corner windows
Hertfordshire

4m rendered extension with Crittall-style doors in Hertfordshire — 4m rendered extension with Crittall-style doors
Hertfordshire

Rendered single-storey extension with full-width sliding doors (in progress) in In progress — Rendered single-storey extension with full-width sliding doors (in progress)
In progress

4m rear extension in London stock brick in Hertfordshire — 4m rear extension in London stock brick
Hertfordshire

Red brick porch with a grey composite door in Hertfordshire — Red brick porch with a grey composite door
Hertfordshire

Brick single-storey rear extension in Borehamwood — Brick single-storey rear extension
Borehamwood

Small rendered ground-floor extension in Borehamwood — Small rendered ground-floor extension
Borehamwood

Kitchen extension with a black marble island and bar seating in Hertfordshire — Kitchen extension with a black marble island and bar seating
Hertfordshire

White render porch with a slate roof in Hertfordshire — White render porch with a slate roof
Hertfordshire

Bright extension with oak flooring and picture windows in Berkhamsted — Bright extension with oak flooring and picture windows
Berkhamsted

Brick rear extension with bi-fold doors in Hertfordshire — Brick rear extension with bi-fold doors
Hertfordshire

Red brick porch with white uPVC door and windows in Hertfordshire — Red brick porch with white uPVC door and windows
Hertfordshire

4m single-storey house extension in Hertford — 4m single-storey house extension
Hertford

Modern extension with skylight and grey tiled floor in Rickmansworth — Modern extension with skylight and grey tiled floor
Rickmansworth

Red brick porch with a pitched tiled roof in Hertfordshire — Red brick porch with a pitched tiled roof
Hertfordshire

Apex tiled-roof extension in Bushey — Apex tiled-roof extension
Bushey

Open-plan extension with oak flooring and bi-fold doors in Welwyn Garden City — Open-plan extension with oak flooring and bi-fold doors
Welwyn Garden City

Symmetrical white render porch with a black door in Hertfordshire — Symmetrical white render porch with a black door
Hertfordshire

Aerial view of a brick rear extension in Hertfordshire — Aerial view of a brick rear extension
Hertfordshire

Brick extension with large sliding doors in Hertfordshire — Brick extension with large sliding doors
Hertfordshire

Open-plan kitchen extension with a white marble island in Hertfordshire — Open-plan kitchen extension with a white marble island
Hertfordshire

White render porch with a sage green door in Hertfordshire — White render porch with a sage green door
Hertfordshire

5m ground-floor extension with sandstone patio in Hertfordshire — 5m ground-floor extension with sandstone patio
Hertfordshire

7m wide rendered rear extension in Hertfordshire — 7m wide rendered rear extension
Hertfordshire

White uPVC porch on a red brick home in Hertfordshire — White uPVC porch on a red brick home
Hertfordshire

Grey rendered extension with bi-fold doors in Hertfordshire — Grey rendered extension with bi-fold doors
Hertfordshire

Rendered extension with sliding doors and skylight in Hertfordshire — Rendered extension with sliding doors and skylight
Hertfordshire

Red brick porch with an anthracite glazed door in Hertfordshire — Red brick porch with an anthracite glazed door
Hertfordshire

Single-storey extension with a flat standing-seam roof and skylights (in progress) in In progress — Single-storey extension with a flat standing-seam roof and skylights (in progress)
In progress

Rendered wrap-around single-storey extension in Hertfordshire — Rendered wrap-around single-storey extension
Hertfordshire

Brick ground-floor extension with bi-fold doors in Hertfordshire — Brick ground-floor extension with bi-fold doors
Hertfordshire

Modern white render porch with a black glazed door in Hertfordshire — Modern white render porch with a black glazed door
Hertfordshire

Single-storey rear extension with bi-fold doors in St Albans — Single-storey rear extension with bi-fold doors
St Albans

Single-storey extension with a zinc standing-seam roof and twin skylights (in progress) in In progress — Single-storey extension with a zinc standing-seam roof and twin skylights (in progress)
In progress

Open-plan extension with skylight and grey porcelain floor in Radlett — Open-plan extension with skylight and grey porcelain floor
Radlett

Kitchen extension with a Calacatta marble waterfall island in Hertfordshire — Kitchen extension with a Calacatta marble waterfall island
Hertfordshire

White render porch with a black composite door in Hertfordshire — White render porch with a black composite door
Hertfordshire

Rear extension with bi-fold and sliding doors in Hertfordshire — Rear extension with bi-fold and sliding doors
Hertfordshire

Single-storey extension with full-width sliding doors in Watford — Single-storey extension with full-width sliding doors
Watford

Red brick porch with anthracite French doors in Hertfordshire — Red brick porch with anthracite French doors
Hertfordshire

Rendered flat-roof extension with sliding doors in Hertfordshire — Rendered flat-roof extension with sliding doors
Hertfordshire

Our house extension services in Stevenage

We help you add the space you need with expertly built house extensions that are designed around how you live, from initial ideas and planning support through to the final finishes. We’re reliable with timelines and communication, craftsmanship-focused in every detail, and customer-centric from day one—so you’ll always know what’s happening and what to expect.

Whether you’re after a bigger kitchen, an extra bedroom, or a more open family space, we’ll manage the build with care, keep disruption to a minimum, and deliver a result that looks great and feels like it’s always been part of your home. We’re proud to serve Stevenage, and we’ll make sure your extension adds real value, comfort, and confidence to your property.

Why choose us for your Stevenage house extension

Our Stevenage extensions are crafted with both style and sustainability in mind. Every build is made to last and delivered with meticulous attention to detail, on time and within budget – no shortcuts, no compromise.

Here's what makes us stand out:

Custom built designs to suit your lifestyle
Premium, low maintenance extensions built to the highest quality
Exceptional insulation for energy efficiency
Professional service from start to finish
Eco-conscious foundation with minimal environmental impact

Planning an extension in Stevenage? Tell us about your project.

Craftsmanship-First House Extensions in Stevenage

When you hire The Home Extension Company for your house extension in Stevenage, you’re choosing a team that puts craftsmanship at the centre of everything we do. We don’t rush the details or treat your home like just another job — we take pride in neat finishes, solid structure, and work that feels like it’s always belonged. From the first conversation to the final handover, we’ll keep things clear, organised, and genuinely enjoyable for you.

If you’re worried that a build will be stressful, messy, or full of surprises, you’re not alone — and we’ve shaped our service to remove that fear. We plan carefully, communicate consistently, and keep you informed so you’re never left wondering what’s happening next. Our 5-star ratings for quality and service aren’t an accident; they come from doing what we say we’ll do, turning up when we should, and respecting your home throughout the process.

We also know you want your new space to feel right, not just look good on day one. That’s why we focus on long-term quality: precise joins, thoughtful layout, and an attention to detail that stands up to everyday life. If you’re extending for a bigger kitchen, an extra bedroom, or more breathing room, we’ll build it with the care your home deserves — and deliver a result you’ll be proud to show off.

Rendered single-storey house extension built by our house extension builders in Stevenage

House extensions that add living space in Stevenage

When your home starts to feel tight, more living space isn’t just a “nice to have” — it changes how every day runs. With a well-planned house extension, we can give you that breathing room: a bigger kitchen where everyone can gather, a light-filled family room that actually fits the sofa you want, or a calm home office that doesn’t double as the dining table. We’ll help you shape the space around how you live now, and how you’ll live a few years from now.

We build extensions that feel like they’ve always belonged to your home, not an awkward add-on. That means lining up rooflines, matching brickwork and finishes, and designing layouts that flow naturally from the existing rooms. We also pay close attention to the details you’ll feel every day — wide openings between rooms, smart storage tucked where it’s needed, and glazing that pulls daylight deep into the house so the new space feels open even on grey afternoons.

Because we’re a family-owned team with over 20 years of experience, we know this isn’t just a project — it’s your home, your routines, your privacy. We’ll keep things straightforward and honest, talk you through options in plain English, and treat your property with care from the first sheet down to the final clean-up. Whether you’re aiming for a spacious open-plan hub or simply want an extra room that makes life easier, we serve Stevenage with the kind of reliable workmanship that earns trust and brings customers back.

Brick rear house extension with anthracite bi-fold doors in Stevenage

Highly insulated house extensions in Stevenage

House extensions let us reshape how a home works without the upheaval of moving. Whether you need a larger kitchen-diner, a brighter living space, or an extra bedroom and bathroom, we can create room for everyday life to flow more comfortably. It’s not just about adding square metres—it’s about improving how you live in the space you’ve already invested in.

At The Home Extension Company, we’re focused on quality craftsmanship and a finish that feels like it was always part of your home. We use premium materials and modern construction techniques to achieve clean lines, strong structure, and details that stand up to daily use. The goal is a seamless extension that complements your existing style, inside and out, so the new space feels natural from the moment it’s complete.

Comfort matters just as much as appearance, which is why we build highly insulated extensions designed for year-round performance. Better insulation helps maintain stable temperatures, improves energy efficiency, and supports a quieter, more comfortable environment—whatever the season brings. We serve Stevenage with extensions that don’t just add space, but add lasting value through smarter, higher-standard construction.

Fast house extension builds in Stevenage

When your home starts feeling cramped, moving isn’t always the best answer. We help you stay where you are and gain the room you’re missing with an efficient house extension that’s built in as little as 3 to 5 weeks. That means less disruption to your routine and more time enjoying a bigger, better layout that suits the way you live.

We use modern construction methods that streamline the build and keep labour costs down, so you don’t have to choose between speed, quality, and price. Want a larger kitchen for busy mornings, a family room that actually fits everyone, or a home office that lets you focus? We’ll tailor the extension to your space and your goals—then deliver it on a timeline that makes sense for real life.

And who wants months of mess, noise, and uncertainty when you could be enjoying your new space in weeks? We’ve designed our process to be clear and efficient from start to finish, keeping you informed and the project moving. If you need a trusted team that serves Stevenage and delivers great value with minimal upheaval, we’re ready to help you transform your home quickly and affordably.

Inside our work

Inside our finished extensions in Stevenage

House extension interior in Stevenage with light oak flooring and grey-framed bi-fold doors onto the garden

Single-storey house extension in Stevenage with oak flooring and a full wall of black-framed sliding doors

Modern wrap-around house extension in Stevenage with grey tiled floor and corner bi-fold doors

Aerial view of a pitched-roof brick house extension in Stevenage

House extension FAQs for Stevenage

How long does a house extension usually take?+

We specialise in fast home extensions, and many of our projects can be completed in as little as 3–5 weeks. The exact timeframe depends on the size, design, access, and any structural work needed, but we’ll set clear timelines from the start and keep you updated throughout so you always know what’s happening next.

Do you handle the project management and organise all the trades?+

Yes—we manage the full build from initial consultation through to completion. We coordinate every trade, keep the schedule moving, and communicate clearly so you’re not left chasing different people. Our goal is to deliver an efficient, well-run extension with minimal disruption to your home.

Will a house extension be warm in winter and comfortable in summer?+

It should be—and we make sure it is. We build highly insulated extensions using premium materials and modern construction methods, which helps maintain year-round comfort and improved energy efficiency. We also focus on a seamless finish so the new space feels like a natural part of your home, not an add-on.

How disruptive is building a house extension while we’re living at home?+

We know that’s a major concern, and we plan around it. Our streamlined approach is designed to reduce disruption compared with traditional builds, and we’ll keep the site organised, maintain clear working timelines, and communicate regularly so you can plan your day-to-day life with confidence.

Do you serve Stevenage, and what’s the first step to get a quote?+

Yes, we serve Stevenage. The first step is an initial chat/consultation where we’ll discuss what you want to achieve, your preferred layout, and any must-haves. From there, we’ll guide you through the next steps and provide a clear plan for moving forward, with honest advice and no unnecessary complications.

Where we work

Building house extensions across Stevenage

Looking for a service other than Extensions in Stevenage?

We also offer porch installation to homeowners across Stevenage, delivered with the same craftsmanship, insulation and end-to-end project management.

Porch Installation in Stevenage

Not in Stevenage? Still looking for Home Extension Builders near me…?

Ready to add space to your home?

Book a free, no-obligation consultation and we'll give you clear timelines, coordinated trades and a smooth, low-disruption build.