At Lintel, we understand that extending your home is more than just an investment, it’s an opportunity to enhance your living space, create new memories, and add value to your property. But with every home extension comes a journey, one that requires careful planning, transparency, and a trusted team to get you through it.
From initial concept to final coat of paint, here at Lintel we’re with you to ensure the process is as seamless as possible. To make things a bit easier on you, we’ve put together a list of expectations you can use to guide you through managing a home extension, including key milestones, costs, and potential challenges.
1. The Home Extension Timeline: What to Expect
While no two projects are the same, most home extensions follow a similar structured process. Let’s break down the key stages and how long they typically take:
Phase 1: Planning & Approvals (2–4 months)
The planning and approvals phase tends to include three key parts. The first being the design consultation, where we start by having a face-to-face discussion about your vision, budget, and priorities to ensure that your extension complements your home and lifestyle.
Planning permission comes next, if it is required – not all extension projects will need this step but don’t worry this will be made clear during the design consultation. If necessary, we’ll navigate this process with local authorities with you so you know exactly what you need and why it’s required.
Finally, the building regulations and structural calculations part of this phase means that you understand which building regulations you have to comply with, why they’re necessary, and how they work. Although annoying on the surface, these are essential for the safety of everyone involved in your project (you and your family included) and the quality of your extension project.
Phase 2: Pre-Construction & Preparation (1–2 months)
This phase comes in two distinct parts. This first is to finalise designs and contracts. This is where we sit with you and refine all the details, agree on costs, and set a realistic construction schedule so you know from the beginning what to expect and when.
Next comes the site preparation which includes securing access, arranging utility disconnections and reconnections, and making sure that everything is in place before the build begins, cutting down on any unexpected surprises later on in your home extension project process, saving you time, money, and unnecessary stress.
Phase 3: Construction (3–6 months, depending on complexity)
This is the exciting but messy bit and includes:
- Foundation & structural work – The groundwork is laid, walls go up, and your extension begins to take shape
- Internal work – Plumbing, electrics, insulation, and heating are installed, followed by plastering and flooring
- Finishing touches – Decorating, fixtures, and final adjustments bring everything together
Phase 4: Completion & Handover (2–4 weeks)
Although you can see your physical dream home extension in all its beauty at the end of phase three, there are still a few final bits to do.
The most important being the final inspection where we carry out quality checks, ensure all building regulations have been met, and you are safe to get back in your home. This is also where any minor issues are addressed to ensure everything matches your dream extension vision.
The final part – move in and enjoy!
2. What’s It Going to Cost?
Costs can vary widely based on the size, complexity, and location of your extension. But there are a few general costings to give you a better idea of how much you need to set aside to make your home extension dreams come true.
| Type of Extension | Estimated Cost (UK)* |
| Single-storey rear/side extension | £70,000 – £120,000 |
| Double-storey extension | £140,000 – £220,000 |
| Loft conversion | £60,000 – £110,000 |
*The above figures include finishes such as kitchens, bathrooms, showrooms and bedrooms.
The Top 5 Factors That Influence Cost
- Size & design complexity – A simple rear extension will be more affordable than a large, multi-storey addition
- Materials & finishes – High-end finishes and bespoke features add value but can also increase costs
- Structural considerations – If major alterations are needed (e.g., removing load-bearing walls), costs will rise
- Labour & professional fees – Architectural drawings, planning applications, and structural engineering fees need to be factored in
- Unforeseen expenses – Older properties may require additional structural work, damp-proofing, or utility upgrades
At Lintel, we provide detailed cost breakdowns upfront, ensuring complete transparency so there are no nasty (and expensive) surprises along the way.
3. Challenges to Be Aware Of (And How We Help You Overcome Them)
Every home extension has its hurdles, but with the right approach, they can be managed effectively. Here are some common challenges and how we navigate them:
1. Planning Delays
Navigating planning permission and building regulations can be complex. Our team takes care of applications and liaises with local authorities to keep things moving and make sure everything you need is in order.
2. Unexpected Costs
Hidden structural issues or changes in material prices can impact the budget. We conduct thorough site assessments and build contingency plans into your budget to save you time and money further down the road.
3. Disruptions to Daily Life
We know that living through construction can be challenging. We work efficiently, keep noise and disruption to a minimum, and provide clear timelines so you know what to expect.
4. Finding the Right Contractors
Poor workmanship can lead to costly delays. With Lintel, you have a dedicated team of trusted professionals who take pride in delivering exceptional results, meaning you get to focus on your dream home, not nightmare builders.
Your Vision, Our Expertise
Managing a home extension is a significant undertaking, but with the right team by your side, it can be an exciting and rewarding experience. At Lintel, we believe in partnership, transparency, and quality craftsmanship. We work with you at every stage of your extension project to ensure it is delivered on time, within budget, and to the highest standards to bring your dream home to life.
Ready to extend your home? Get in touch today to start your journey. Let’s bring your vision to life together.