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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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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 a personal, luxury building experience and full project management service.
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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
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Full Project

Deciding if you want a single or double extension can be much simpler than it looks. We can break down costings and show you how far your budget can take you. If you are wanting to extend your dining room at the back of your home, add a home office, or looking for a two-storey extension with an open plan kitchen downstairs and a cosy bedroom upstairs, we are here to help.
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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 value engineer the entire project to get you the best quality at trade pricing.
Expert Extensions
Extension experts
We collaborate with professionals in the Construction Industry who share the same vision and desire for building dream, luxury homes as we do. From our architects to electricians, The Milestone Method connects everyone together.
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.
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.
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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.
Start Planning
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Modern Methods. Traditional Values.
Our goal with every project is simply to build your dream living space. Everything is tailored to your requirements and preferences – getting the absolute most out of your budget. To achieve that, we use our tried-and-tested Milestone Method. A unique process that ensures your project runs smoothly and finishes on budget.