House Extensions · Radlett

House Extensions in Radlett

We build fast, beautifully crafted house extensions that feel like they’ve always belonged—professionally managed from start to finish.

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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

Expert project-managed builds
Family-run, trusted team
Fast extensions in weeks
Premium, energy-smart craftsmanship
5-star customer satisfaction

Trusted house extension builders serving Radlett

The Home Extension Company delivers high-quality house extensions for homeowners across Radlett, combining reliable project management with craftsmanship-driven builds designed to feel like a natural part of your home. From the first consultation to final handover, an experienced team coordinates every trade, keeps timelines clear, and maintains regular updates to ensure a smooth, low-disruption experience. As a family-owned company with over 20 years of experience and consistent 5-star reviews, The Home Extension Company is known for honest, customer-focused service and dependable results. Specialising exclusively in fast home extensions, many projects can be completed in as little as 3–5 weeks using streamlined construction methods without compromising structural performance. Every extension is finished with premium materials and highly insulated construction for year-round comfort, energy efficiency, and a seamless, high-end finish.

Open-plan house extension in Radlett 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 Radlett extension today

Tell us what you’re planning, and we’ll handle the details—book your free consultation and get a clear timeline and quote for your Radlett home extension.

Get a free quote 01727 224616

Recent work

House extensions we've built in Radlett

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

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

Our house extension services in Radlett

At The Home Extension Company, we help you create the extra space your home needs with expertly planned and built house extensions that suit your lifestyle and add lasting value. We’ll guide you through the whole process—from understanding what you want and shaping a practical design, to managing the build and keeping everything running smoothly—so you’re never left guessing.

Because we’re reliable, craftsmanship-driven, and customer-focused, you can count on clear communication, tidy working practices, and a finish that feels like it’s always been part of your home. If you’re planning a rear, side, or wraparound extension, we’re ready to help and proudly serve Radlett.

Why choose us for your Radlett house extension

Our Radlett 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 Radlett? Tell us about your project.

Customer-Focused House Extensions in Radlett — Built Around Your Home

We know a house extension isn’t just extra space — it’s your daily life, routines, and comfort. That’s why, when we deliver house extensions serving Radlett, we start by listening properly and planning around what matters to you. From the first conversation to the final finish, we keep things clear, considerate, and tailored, so you’re never left guessing what’s happening next.

As a family-owned and operated team with over 20 years of experience, we bring a personal approach you can feel throughout the build. We treat your home as if it were our own, turning up when we say we will, respecting your space, and keeping disruption to a minimum. Our reputation has been built on trust and reliability, and we work hard to earn that trust on every project, no matter the size.

You’ll get straightforward advice, honest timelines, and workmanship that’s made to last — because we’re focused on the long term, not just the handover day. We’ll help you make confident decisions on layout, light, flow, and finishes, so your extension fits seamlessly with your home and the way you live. The result is a space that feels right from day one, and a building experience that feels calm, organised, and genuinely customer-first.

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

House extensions that add living space in Radlett

When the kitchen starts feeling like a corridor and the dining table doubles as a homework station, it’s a clear sign you need extra space. We help you turn that daily squeeze into a home that flows—whether that’s a brighter open-plan kitchen-diner, a calm home office with the door that actually shuts, or a snug family room where everyone can spread out without stepping over each other.

A well-planned house extension doesn’t just add square metres—it changes how your home feels from the moment you walk in. We’ll map out the spaces you’re missing, consider natural light and sightlines, and shape rooms that work for real life: wider walkways, smarter storage, and finishes that match the character of your existing home so it doesn’t feel like an “add-on.”

To keep disruption down, we manage the build professionally from start to finish. We’ll coordinate every trade, keep timelines clear and realistic, and update you as the project moves through each stage—so you’re not left guessing who’s arriving when or what’s happening next. We serve Radlett and surrounding areas, delivering extensions efficiently and with the kind of organised site management that keeps your home as liveable as possible while the extra space takes shape.

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

Highly insulated house extensions in Radlett

A house extension isn’t just extra square metres; it’s a practical test of a popular theory: that the best homes don’t stay “finished,” they evolve. When life changes—new family needs, work-from-home routines, or simply the desire for better flow—moving can feel like the default answer. Yet, when we explore that assumption, the deeper truth often emerges: what most people really want isn’t a new address, it’s a home that fits who they are now, without losing what they already love.

We’ve found that the real value of an extension comes from the experience as much as the outcome. The theory says building work is always stressful—but it doesn’t have to be. With clear communication, careful planning, and attention to detail, the process can feel structured and surprisingly calm. That’s why we focus on a hassle-free journey from first enquiry to final handover, and why our consistent 5-star reviews reflect quality craftsmanship matched with service that respects your time, space, and peace of mind.

If you’re considering a house extension in Radlett, we’ll help you think beyond “adding a room” and towards creating a better way to live in your home. The deeper meaning behind extending is this: it’s an investment in everyday moments—how you cook, gather, work, rest, and move through your space. When it’s done well, an extension doesn’t just change the house; it changes how the house supports you.

Fast house extension builds in Radlett

At The Home Extension Company, we make it easier to expand your home without turning your life upside down. Our modern build approach helps us deliver efficient house extensions with minimal disruption, so you can keep day-to-day routines moving while your new space takes shape. If you’re looking to upgrade your lifestyle without the long wait, we’re set up to help you get there faster.

We serve Radlett with a streamlined process designed to keep timelines tight and costs sensible. That means you’re not only getting speed—you’re getting exceptional quality at a competitive price because our construction methods help keep labour costs down. Expect a clear plan and schedule from the start, efficient on-site work that reduces downtime, and a finish that feels like it’s always belonged in your home.

Whether you’re planning a larger kitchen, a brighter family room, a dedicated home office, or simply more living space, we’ll help you unlock that potential in weeks, not months. We’ll guide you through the decisions that matter, keep communication straightforward, and focus on delivering a home extension you’ll enjoy right away—without the drawn-out build that so many homeowners dread.

Inside our work

Inside our finished extensions in Radlett

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

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

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

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

House extension FAQs for Radlett

How long does a house extension usually take?+

We specialise in fast home extensions, so many of our projects can be completed in as little as 3–5 weeks, depending on the size and complexity. Before we start, we’ll talk you through the build programme, confirm lead times, and keep you updated throughout so you always know what’s happening next.

Will we need planning permission for our house extension?+

We’ll help you figure out whether your extension falls under permitted development or whether planning permission is required. Every home is different, so we’ll look at your property, what you want to achieve, and any local considerations for homes we serve in Radlett, then guide you on the best route to stay compliant.

How much disruption should we expect during the build?+

We plan our builds to keep disruption as low as possible. Because we use streamlined construction methods and professional project management, we coordinate every trade, keep clear timelines, and keep the site organised. We’ll also agree access, working hours, and key milestones with you upfront, so home life can carry on as smoothly as possible.

How do you make sure the extension matches our existing home?+

We focus on quality craftsmanship and a seamless finish, so the extension looks and feels like it belongs. We’ll advise on materials, rooflines, windows/doors, and internal details, and we’ll build with modern methods that deliver a clean junction to the existing structure—without compromising structural performance.

Will our extension be warm, energy-efficient, and comfortable all year round?+

Yes—our extensions are built with highly insulated construction and premium materials to support year-round comfort and strong energy efficiency. We’ll explain the insulation approach, ventilation considerations, and how we reduce heat loss, so you get a space that feels like a true part of your home—not an add-on.

Where we work

Building house extensions across Radlett

Looking for a service other than Extensions in Radlett?

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

Porch Installation in Radlett

Not in Radlett? 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.