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House Extensions

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House Extension Sheffield
Design To Budget
Designed to Budget
One Point Of Contact
One Point of Contact
Fully Managed
project Managed


Expertly designed and built for you

Whether you want to upsize for a new arrival, increase the value of your property or add more living space to your home, a house extension ticks all the boxes. The challenge is getting the design just right, so it balances your requirements, preferences and budget. That’s exactly what we do at Milestone Builders.

Using our unique Milestone Method, our team will work with you on every step of the extension process. From your initial idea for an extension through to furnishing your dream living space – we’ll make sure everything runs smoothly so you get the perfect living space to work, play and live.
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Modern House Extensions Sheffield

Bespoke house extensions

Want to extend your dining room at the back of your home? Or add a playroom for the kids? Maybe it’s a two-storey extension you’re after, with a bedroom and en-suite? Whatever your requirements, we’re here to help.

At Milestone Builders, we work on projects no matter how big or complex, throughout Sheffield and the surrounding areas. From Rotherham and Barnsley to Matlock and Chesterfield, our team delivers the same high-quality service that saves our clients time, hassle and money with the best results.
managing your project

Our house extension process

To get the best results for your home, we use our unique Milestone Method to manage every step of the extension process. That includes the input from all contractors and stakeholders throughout planning and installation, with full transparency for you.
  • Step 1 - Meet
    First things first, we’ll meet with you to understand what you want from your extension. Size, shape, what you’ll be using it for, key features and how you want it to look and feel. We’ll make sure we know everything before we get started.
  • Step 2 - Plan
    Rather than having an architect design something that’s impractical, we combine architectural expertise with construction know-how to create designs that deliver what you want, how you want it without throwing your budget out of the window.
  • Step 3 - Cost
    Your extension plans will be designed to suit your budget. We will then have them checked by an independent Quantity Surveyor to ensure all costs are accounted for and show you how much each element will cost before we go to tender.
  • Step 4 - Value-engineer
    Time to work our magic. We’ll tender the project to trusted contractors and suppliers to get the lowest price, highest quality and utmost reliability for each part of your extension. Cherry picking the best quotes, our team can value engineer the entire extension to minimise the overall cost while maximising quality.
  • Step 5 - Build
    After discussing your options and deciding on the final design, we’ll manage the full building and installation process down to the moment you set your eyes on it. Everything is completely guaranteed with watertight contracts for each contractor.
  • Step 6 - Impress
    Our results speak for themselves. You’ll get a flawless extension that looks incredible and stands the test of time. Use it as an office, dining room, playroom or whatever you want, all with peace of mind, full protection and zero hassle.
Brief us on your project
  • "Thank you so much for all your work. Our house is spectacular now and we love it. All our friends are jealous and will be calling you very soon. Thanks again for the hard work."
    Sarah & Pete - Sheffield
  • "Milestone weren't the cheapest quote we got but they included everything, including things we didn't realise we needed! This meant we got a fixed price job which came in on budget. I would recommend this trustworthy company to anybody I know."
    Joe green | Sheffield
  • "I would just like to thank everyone at Milestone Builders for all your hard work. The whole team was a pleasure to have around and the tidiness was very unexpected but appreciated. The workmanship and quality of my new kitchen diner is fantastic and just what I wanted."
    Diane Stone | Sheffield
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House Extension Specialists

Why Milestone Builders?

Fair Price
Fair price
By combining architecture and construction from the word go, we can minimise your extension cost without compromising on what you want and need. We don’t do cheap extensions. What we do is value engineer the entire project to get you the best quality at the best price.
Expert Extensions
Extension experts
You don’t want cowboys working on your house. With us on your side, that’s out of the question. We only work with fully qualified professionals – specialists across the board. That means no fear of choosing the wrong person on your end, and only the best results.
Local Builders
Local builders
As a local team of builders, we’re on hand whenever you need us. That includes lifetime support after your extension has been designed and built. Best of all, we talk your language – with a local Sheffield accent as a bonus.
Timed Served
Working on extensions across Sheffield for over 20 years, it’s fair to say we know them like the back of our hand. Costs, timescales and the best materials and methods are all second nature to us – not to mention a long list of happy customers from two decades of hard graft.
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Get an instant cost estimate
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Call now on 0114 489 4425
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Extension Company Sheffield

Start planning your house extension

Want to find out more about your house extension, timescales and the potential cost? It all starts with a call. Our team is always happy to discuss projects in more depth with no charge or obligation.
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Milestone Builders Guide
Find out more

guide to the milestone method

The pioneering Milestone Method is our roadmap to outstanding results at the lowest price. If you want to find out more about how we can maximise the value of your project, download our Milestone Method guide for a more in-depth explanation.