How to Plan a Home Renovation: A Step-by-Step Guide (2026)

Key Takeaways

Start with a clear brief and budget, including a 10 to 15% contingency.
Sort design and permissions before committing to a build date.
Choose a builder on references and certificates, not just price.
Agree a detailed, itemised quote and contract before work starts.
Sequence the work correctly to avoid costly rework.

A renovation that runs smoothly is almost always one that was planned well. This step-by-step guide takes you from first idea to finished home, so you know what to do, in what order, and what to watch for.

1. Set your brief and budget

Start by writing down what you want to achieve, how you use the space, and what success looks like. Then set a realistic budget, and add a contingency of 10 to 15% for the surprises that older London homes always hold. A clear brief keeps every later decision anchored.

2. Design and permissions

Arrange a survey and develop the design, then confirm what approvals you need. Many projects fall under Permitted Development, while others need planning permission. Almost all need Building Regulations approval. Sort this before fixing a build date.

3. Choose your builder carefully

Select on references, recent comparable work, insurance and certifications, not just the lowest price. Get detailed, itemised quotes so you can compare like with like, and agree a written contract with a clear scope, programme and payment schedule. See our guide to choosing a builder in London.

4. Sequence the work

Renovation follows a logical order, and doing it correctly avoids expensive rework:

Structural and external works
First-fix plumbing and electrics
Plastering
Second-fix, flooring and joinery
Kitchen and bathroom fitting
Decoration and snagging

5. Manage and snag

Keep communication regular, expect to make decisions promptly, and finish with a thorough snagging list so every detail is right before final payment. Using one accountable team for design and build keeps the whole process coordinated. For a free consultation on your project, contact us or call 07472 424 226.

The GS Renovation Team

GS Renovation & Home Improvements has delivered kitchen, bathroom, structural and extension projects across London for over 30 years. This guide reflects current UK industry pricing and our hands-on site experience.

Frequently Asked Questions

How do I start planning a renovation?

Begin by writing a clear brief of what you want to achieve and how you live, then set a realistic budget with a contingency. From there, arrange a survey and design, confirm any permissions needed, and get detailed quotes from reputable builders. Planning thoroughly upfront prevents the most expensive mistakes later.

In what order should renovation work be done?

Work flows from the structure outwards: structural and external works first, then first-fix plumbing and electrics, plastering, then second-fix, flooring, kitchen and bathroom fitting, and finally decoration. Doing things in the wrong order causes rework, so a clear programme is essential.

How much contingency should I include?

Set aside 10 to 15% of the build cost as a contingency, especially in older London homes where hidden issues only appear once work starts. A contingency lets you absorb surprises without stalling the project or compromising the finish.

Should I use an architect or a design-and-build contractor?

An architect is valuable for complex or design-led projects, while a design-and-build contractor manages design and construction under one roof, which reduces coordination gaps and is efficient for most renovations. The right choice depends on the project's complexity and your budget.

How far ahead should I plan a renovation?

Allow several months of lead time before work starts for design, any planning permission (around 8 weeks for a decision), structural calculations and builder availability. Good contractors are often booked weeks or months ahead, so plan early.

How to Plan a Home Renovation