A home extension is one of the best ways to add value and space to your property, but for many homeowners, the process can feel daunting. Whether you’re building a light-filled kitchen-diner or a two-storey addition for extra bedrooms, knowing what to expect can make your project run more smoothly and help you feel in control.
Here’s what you can expect at each stage of your home extension journey — plus a few tips to help you get the most from working with your design and build team.
1. Setting Your Goals
Before anything else, take time to get clear about your “why”. Are you craving an open-plan family space, a bigger kitchen, or an extra bedroom for guests? Having a clear vision — plus any must-haves or nice-to-haves — helps your architect or designer turn your ideas into a practical plan.
2. Establishing Your Budget
Cost is understandably one of the biggest concerns for clients. Good professionals will help you understand the likely costs involved, including:
- Design and planning fees
- Surveys and structural calculations
- Planning permission or permitted development considerations
- Build costs (which can vary by site conditions, specification, and location)
- VAT and contingencies
A realistic contingency (10-15% is typical) can help you handle any surprises without stress.
3. Concept Design & Drawings
This is the exciting bit! Your architect will translate your wish-list into sketches and plans. They’ll discuss design options, materials, and how best to make the extension flow with your existing home. Once you’re happy, these drawings can be developed into detailed plans for planning approval and construction.
4. Planning Permission & Building Regulations
Not all extensions need full planning permission — some fall under Permitted Development Rights. Your architect will guide you through what applies to your project and submit any applications on your behalf. Once approved, you’ll also need to meet Building Regulations to ensure the work is safe and legal.
5. Choosing Your Builder
If you’re working with a Design & Build company, they’ll handle this for you. Otherwise, you’ll need to find reputable builders, ideally with good local references. A detailed tender pack helps contractors quote accurately and minimises unexpected costs later.
6. Construction Phase
This is when your ideas finally become reality — but expect some disruption! Good builders will protect your existing home as much as possible, but dust, noise, and limited access are unavoidable at times.
Top tips for a smooth build:
- Keep communication open — weekly site meetings help everyone stay on the same page.
- Stick to agreed decisions — last-minute changes can add time and cost.
- Be realistic about timescales. Weather, material supply, or structural surprises can occasionally cause delays.
7. Final Touches & Sign Off
When the build is finished, there’s still some important work to do: snagging, final inspections, and any certificates needed for compliance. A reputable contractor will walk you through the project to address any issues before handing over.
8. Living in Your New Space
A home extension is an investment in your lifestyle as well as your property value. Take time to settle in, enjoy the extra space, and make it your own.
Why It’s Worth Doing It Right
While an extension can feel like a big undertaking, working with experienced professionals makes the journey smoother and more enjoyable. You’ll know what to expect, what decisions to make, and how to manage your budget.
If you’re ready to talk about expanding your home, our team is here to guide you every step of the way. Contact us for a free consultation and let’s unlock your home’s true potential.
by Kevin Knox