Tailored Home Extension Services in the North East
What’s Involved in a House Extension
A house extension adds valuable living space to your North East property without the upheaval of moving. Whether you need a larger kitchen, extra bedroom, or home office, a well planned extension transforms how you use your home.
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Planning and Design
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Assessing your goals and how you’ll use the space
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Understanding planning permission requirements
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Structural calculations for wall removals and roofing
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Draining considerations and rerouting if needed
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Building Control approval process
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Construction Process
House extensions typically involve these stages
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Groundwork and Foundations (Weeks 1-2)​​​​
Excavation, drainage work, foundations.
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Structural Work (​Weeks 3-5)
Brickwork, block work, roof structure
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First Fix (Weeks 6-7)
Electrical and plumbing installation, Windows and External Doors, Overboarding.
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Second Fix and Finishes (Weeks 8-12)
Plastering, electrical and plumbing fittings, kitchen/ bathroom installation if included, joinery and internal doors, flooring, decoration.
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Final Inspection and Handover Weeks 12-14)
Cleaning, final walkthrough, snagging, building control certificate.
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Timeline Expectations
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Single Storey Extension 10-14 weeks
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Double Storey Extension 14-18 weeks
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Wrap Around Extension 16-20 weeks
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Timelines depend on weather, ground conditions, material lead times and building control scheduling.
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How We Approach House Extensions
At Rushmore, peace of mind starts from the first conversation.
We believe a smooth build begins with a clear, collaborative process — one where you’re involved at every step, from design choices to timelines and cost.
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Our approach is structured but flexible, giving you the information you need to make confident decisions without overwhelm. After all, this isn’t just another build — it’s your home, your investment, and your vision coming to life.
01. Discovery Call
Our first step is a friendly phone call where we get to know your goals, timeline, and priorities. We’ll ask the right questions to understand what you’re after — whether it’s a rear extension, a full renovation, or a kitchen redesign.
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We’ll introduce our Investment Tiers so you can see how the level of finish affects the budget, and we’ll give you ballpark pricing based on similar projects we’ve delivered across the North East.
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Need drawings or planning support? Our optional Design & Build Service gives you architectural plans and early costing advice in one joined-up process — with first refusal on our build schedule once designs are complete.
Why Build a House Extension?
For most people, an extension starts with a need for space — whether that’s a bigger kitchen, room for a growing family, or simply making the layout work better day to day. But space alone isn’t the real benefit. A good extension makes your home feel right again — more comfortable, more usable, and more enjoyable to live in.
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Many homeowners across Durham, Newcastle and South Tyneside come to us because moving just doesn’t make sense. House prices, stamp duty, school catchments, stress — all for a home that still needs work when you get there. A house extension offers a chance to stay rooted, keep the parts of the home. you love, and change the parts that no longer work. ​
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At Rushmore, we offer a full Design and Build Service, which means you don’t need to hire an architect separately or guess at costs. We’ll help you plan your project from the ground up, making sure it flows well, fits your needs, and stays aligned with your budget from the start.
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Many clients also choose to update key rooms as part of the project — especially kitchens and bathrooms, which often sit at the heart of these changes. That way, the new space isn’t just bigger — it’s better.
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Done properly, an extension doesn’t just add square metres — it gives you back a home that works for how you live now, and for years to come.
