Lancashire's customer-first construction team

Extensions managed, built and delivered with confidence

Your extension deserves more than a builder who can simply do the work. It deserves a team that can manage the entire project with confidence. Backed by over 15 years of construction experience, Renex helps homeowners build with clarity from the first conversation to the final walkthrough.

headshot of Caleb Smith, Renex owner

Talk to Caleb about your extension

Not ready to chat? Enquire online

Lancashire's customer-first construction team

Extensions managed, built and delivered with confidence

Your extension deserves more than a builder who can simply do the work. It deserves a team that can manage the entire project with confidence. Backed by over 15 years of construction experience, Renex helps homeowners build with clarity from the first conversation to the final walkthrough.

headshot of Caleb Smith, Renex owner

Talk to Caleb about your extension

Not ready to chat? Enquire online

Lancashire's customer-first construction team

Extensions managed, built and delivered with confidence

Your extension deserves more than a builder who can simply do the work. It deserves a team that can manage the entire project with confidence. Backed by over 15 years of construction experience, Renex helps homeowners build with clarity from the first conversation to the final walkthrough.

headshot of Caleb Smith, Renex owner

Talk to Caleb about your extension

Not ready to chat? Enquire online

Introduction

The right extension starts with the right team.

An extension is one of the biggest investments you'll make in your home. If the wrong team is managing it, the cost goes far beyond the quote. Delays, unfinished work, poor communication and expensive mistakes can quickly turn an exciting project into months of unnecessary stress.

That's why we built Renex differently. Backed by over 15 years of construction experience, we've combined quality building work with a customer-first approach to project management that keeps your extension organised, your project moving and you informed from the first conversation to the final handover.

Extensions we build.

Single-storey, garage conversions, loft extensions. We've got your back no matter the project.

01.

Rear Extensions

Extend your home into the garden with a rear extension designed around the way you live. Whether you're creating a larger kitchen, dining area or open-plan family space, we'll help you plan, manage and deliver your project with confidence from day one.

02.

Side Extensions

Unlock the unused space beside your home with a side extension that creates valuable additional living space without changing where you live. From planning through to completion, we'll keep your project organised, on track and moving forward with confidence.

03.

Wrap-Around Extensions

Combine the benefits of a rear and side extension to completely transform the way your home works. We'll help you plan, manage and deliver your project with confidence from day one.

04.

Double Storey Extensions

Expand your home across two floors to create the additional space your family needs today and for years to come. With careful planning, experienced project management and clear communication throughout, we'll deliver your extension with confidence from start to finish.

05.

Garage Conversions

Transform an underused garage into practical living space without increasing the footprint of your home. Whether you're creating a home office, additional bedroom or family room, we'll guide your project from the first conversation to the final handover.

06.

Loft Conversions

Make the most of your existing home by converting unused roof space into a bright, practical new room. We'll help you unlock your home's potential with a carefully managed project from start to finish.

Our Extension Process

Extensions are difficult. Our process keeps it simple.

Building an extension doesn't have to feel uncertain. Our structured process keeps your project organised, keeps you informed and makes sure you always know what happens next.

(01)
Home Visit

We'll visit your home, understand what you're looking to achieve and talk through the options available. You'll receive honest advice, practical recommendations and a clear understanding of what's possible before making any decisions.

(02)
Planning

Once we've agreed the direction, we'll provide a detailed quotation, project plan and realistic timescales so you know exactly what's included before work begins.

(03)
Construction

Your extension gets underway with one experienced team managing the project from start to finish. You'll receive regular updates, clear communication and complete visibility throughout the build.

(04)
Handover

Before we leave, we'll walk through every part of the project together, making sure everything meets the standard we promised and you're completely happy with the finished result.

Client Portal

Keep track and stay organised throughout the extension build

An extension isn't something that happens overnight. Documents, schedules, updates and key milestones all build up throughout the project. Your Client Portal keeps everything organised in one place, so you always know where your project stands and what's coming next.

Learn more

A tablet displaying a project management interface with a progress tracker and task list rests on a woven fabric surface beside a wooden table edge.

Testimonials

Testimonials

Our clients say it best.

Our clients say it best.

Home Extensions Lancashire | Renex Construction | East Lancashire & Ribble Valley
The work was completed to a very high standard, and any minor niggles were dealt with quickly and professionally. Caleb and his team were fantastic - professional, friendly, and easy to have around, even when the site was muddy and messy. They cleaned up both the work area and the surrounding street when they had finished, leaving everything looking amazing.
Caleb is an absolute star. We've been lucky to have him do two quite sizeable projects for us, and both are amazing. He turns up when he says he will, gets stuck into the job, and doesn't stop until it's done. Great communication, great design ideas, and a great work ethic all add up to a fantastic experience and end result.
Tracey Atkins

Renex Client

Discuss your extension today

Let's start building.

Renex owner Caleb has spent 15 years helping homeowners expand their home through premium extensions that stand the test of time. Book a home visit to discuss your ideas, explore what's possible and get straightforward advice on the best way to move your project forward. There's really nothing to lose.

headshot of Caleb Smith, Renex owner

Discuss your project with Caleb today.

headshot of Caleb Smith, Renex owner

Discuss your project with Caleb today.

Not ready to chat? Enquire online

A man stands confidently with crossed arms beside a white van parked on a suburban street, with a row of brick houses and a partly cloudy sky in the background.

Frequently Asked Questions

Frequently Asked Questions

Your extension questions, answered.

Your extension questions, answered.

Not always. Many extensions fall within permitted development rights, meaning no planning application is needed. The size, type and location of your extension determines whether permitted development applies. We advise on this at the home visit before any work is discussed.

Permitted development allows certain types of extension to be built without a full planning application, provided they meet size and location criteria set by the local authority. Planning permission is required when a project falls outside those criteria. We confirm which applies to your project at the home visit.

Most single storey extensions take between eight and sixteen weeks from start to handover, depending on size and specification. Larger projects such as wrap-around extensions or double storey builds take longer. We agree a clear timeline during the project setup stage so you know exactly what to expect before work begins.

Extension costs vary depending on size, type and specification. A single storey extension typically starts from £30,000 and rises with size, glazing, structural complexity and the quality of internal finishes. We provide detailed, itemised quotes so you know exactly what you're paying for.

A well-built extension consistently adds value to a property, particularly when it adds a bedroom, improves the ground floor layout or creates a kitchen dining space. The quality of the build and how well it integrates with the existing property determines how much value it adds.

In most cases yes. We plan the build sequence to minimise disruption to your daily life and keep the site organised throughout. We discuss this with you during project setup so you know what to expect at each stage.

Yes. Building regulations approval is required for all extensions and we manage the full submission and sign-off process. You receive all relevant certification on completion.

We build single storey extensions, rear extensions, wrap-around extensions, side extensions, garage conversions and loft conversions across East Lancashire and the Ribble Valley.

headshot of Caleb Smith, Renex owner

Discuss your project with Caleb today.

headshot of Caleb Smith, Renex owner

Discuss your project with Caleb today.

Areas we serve

Based in Colne.
Serving Lancashire.

Colne

Nelson

Barnoldswick

Earby

Barrowford

Foulridge

Trawden

Burnley

Padiham

Briercliffe

Worsthorne

Clitheroe

Whalley

Longridge

Sabden

Chatburn

Waddington

Downham

Gisburn

Langho

Wilpshire

Accrington

Great Harwood

Oswaldtwistle

Rishton

Clayton-le-Moors

Church

Blackburn

Darwen

Mellor Brook

Rawtenstall

Bacup

Haslingden

Whitworth

Waterfoot

Helmshore

Hebden Bridge

Todmorden

Sowerby Bridge

Halifax

Mytholmroyd

Keighley

Haworth

Silsden

Steeton

Oakworth

Skipton

Gargrave

Cononley

Embsay

Littleborough

Wardle

Milnrow

Areas we serve

Based in Colne.
Serving Lancashire.

Colne

Nelson

Barnoldswick

Earby

Barrowford

Foulridge

Trawden

Burnley

Padiham

Briercliffe

Worsthorne

Clitheroe

Whalley

Longridge

Sabden

Chatburn

Waddington

Downham

Gisburn

Langho

Wilpshire

Accrington

Great Harwood

Oswaldtwistle

Rishton

Clayton-le-Moors

Church

Blackburn

Darwen

Mellor Brook

Rawtenstall

Bacup

Haslingden

Whitworth

Waterfoot

Helmshore

Hebden Bridge

Todmorden

Sowerby Bridge

Halifax

Mytholmroyd

Keighley

Haworth

Silsden

Steeton

Oakworth

Skipton

Gargrave

Cononley

Embsay

Littleborough

Wardle

Milnrow

Areas we serve

Based in Colne.
Serving Lancashire.

Colne

Nelson

Barnoldswick

Earby

Barrowford

Foulridge

Trawden

Burnley

Padiham

Briercliffe

Worsthorne

Clitheroe

Whalley

Longridge

Sabden

Chatburn

Waddington

Downham

Gisburn

Langho

Wilpshire

Accrington

Great Harwood

Oswaldtwistle

Rishton

Clayton-le-Moors

Church

Blackburn

Darwen

Mellor Brook

Rawtenstall

Bacup

Haslingden

Whitworth

Waterfoot

Helmshore

Hebden Bridge

Todmorden

Sowerby Bridge

Halifax

Mytholmroyd

Keighley

Haworth

Silsden

Steeton

Oakworth

Skipton

Gargrave

Cononley

Embsay

Littleborough

Wardle

Milnrow

Logo of Renex featuring a stylized orange and white design with the brand name in bold letters.

Telephone

07766 547180

E-mail

info@renexconstruction.co.uk

Address

59 Harrison Drive

Colne

Lancashire

BB8 9SJ

Designed by Initial Pixel

Logo of Renex featuring a stylized orange and white design with the brand name in bold letters.

Telephone

07766 547180

E-mail

info@renexconstruction.co.uk

Address

59 Harrison Drive

Colne

Lancashire

BB8 9SJ

Designed by Initial Pixel