How to Plan a Home Renovation From Start to Finish

A realistic, phased roadmap for UK homeowners — from first brief to final completion certificate.

RenoHub · 18 June 2026 · 6 min read

Step 1: Define the brief

Before you call a single contractor, write down what you actually want. It sounds obvious, but most renovation projects go over budget and over time because the brief shifts halfway through.

Your brief should cover: which rooms or areas are in scope, what the end result should look and feel like, any non-negotiables (a downstairs WC, a specific layout, a particular finish), and what you are happy to compromise on. A written brief means every contractor quotes on the same job — which makes comparing prices meaningful.

While you are defining scope, decide which tasks you will handle yourself and which need a professional. Painting and decorating, tiling a backsplash, or laying laminate flooring are realistic DIY tasks for a careful homeowner. Structural alterations, gas work, and most electrical work are not — and some jobs are legally required to be done by a qualified trade.

Step 2: Set the budget — and the contingency

Get a rough sense of likely costs before you approach any trades. Online renovation cost guides (Checkatrade and Rated People publish UK averages) give ballpark figures per room or project type. These vary significantly by region — London and the South East typically run 20–30% higher than the national average.

Once you have a rough total, add a contingency of 10–20% on top. Older properties almost always surface surprises — hidden damp, outdated wiring, undersized joists — and you need the headroom to deal with them without stopping the project.

Split your budget into categories: structural and fabric; first fix (drainage, electrics, plumbing behind walls); finishes (plastering, tiling, joinery); fittings and appliances; and decoration. This makes it easier to track where money is going as the project runs.

Step 3: Check permissions before you start

Permissions fall into two separate categories, and it is important not to confuse them.

Planning permission controls what you build and how it looks from the outside. Many common projects fall within permitted development rights and do not need a formal application — but there are conditions, and if your property is listed, in a conservation area, or a flat, the rules are different. The Planning Portal is the right starting point. For the full picture, see our guide: Do You Need Planning Permission for Your Renovation?

Building Regulations are separate. They cover structural integrity, fire safety, insulation, drainage, ventilation, and the standard of electrical and plumbing work. Many projects that do not need planning permission still require Building Regulations approval — extensions, loft conversions, structural wall removals, and most rewires all fall into this category. You apply to Local Authority Building Control (LABC) or an approved inspector. A Building Control officer will inspect the work at key stages and issue a completion certificate at the end.

Some specialist work can be self-certified: window and door replacements by a FENSA-registered installer, and certain gas and electrical work by Gas Safe Register and NICEIC/NAPIT-registered contractors respectively. Ask your trade whether they are registered to self-certify — it saves a separate Building Control notification.

Step 4: Find and vet your trades

Personal recommendation is still the most reliable route. Ask neighbours, friends, or your estate agent who they have used for similar work. If you are starting from scratch, TrustMark is the government-endorsed scheme for trades working in the home — it covers competence, customer service, and trading practice.

Get at least three written quotes for every significant piece of work. Quotes should itemise labour and materials separately so you can compare like for like. Before accepting, check that the contractor carries public liability insurance and ask for references from recent, similar projects. Where possible, visit a completed job.

For larger projects, consider whether you need a project manager or an architect to coordinate trades. A main contractor can take on this role, but it usually adds cost. On complex projects, the coordination fee often saves more than it costs in avoided delays and rework.

Step 5: Sequence the work correctly

The order of work matters enormously. Getting it wrong is expensive — you cannot tile a floor and then cut through it to run drainage, or plaster walls and then discover the electrics need moving.

The correct sequence for a major renovation is:

1. Structure and fabric — any structural work (walls, steels, roof repairs), damp treatment, and making the building weather-tight. Everything else depends on this being right first.
2. First fix — the services that will be hidden in walls and floors: drainage runs, soil pipes, electrical cabling, central heating pipework, and mechanical ventilation ducts. Inspected by Building Control at this stage if notifiable work is involved.
3. Plastering and screeding — walls and ceilings plastered; floor screeds laid. A wet plaster needs a minimum drying time (typically one week per millimetre of undercoat) before the next trade can follow. Rushing this is a common mistake.
4. Second fix — sockets, switches, light fittings, radiators, and sanitary ware are installed once surfaces are dry. Kitchens and fitted furniture are typically fitted at this stage too.
5. Joinery and tiling — skirtings, architraves, internal doors, tiling. These follow second fix because they butt up to finished fittings.
6. Decoration — painting and decorating last. Any earlier and you will be touching it up indefinitely.

Step 6: Manage materials and deliveries

Materials arriving at the wrong time — too early (nowhere safe to store them), too late (trades standing idle) — is one of the most common causes of programme delays and cost overruns.

Create a simple materials schedule: what needs to be ordered, when it needs to arrive on site, and who is ordering it (you or the contractor). For tiles, flooring, and paint, always order 10–15% more than the calculated coverage — cutting patterns and avoiding future dye-lot mismatches is worth the extra spend.

Screwfix, Toolstation, and Wickes are useful for consumables and last-minute items. For structural materials, timber, and plasterboard, trade merchants like Travis Perkins and Selco typically offer better trade pricing if your contractor has an account.

Step 7: Snagging

Before your final payment to any contractor, walk through the finished work methodically and note anything that is incomplete, damaged, or not to the agreed standard. This is called snagging. Do it before you pay the final invoice — not after.

A written snagging list with photos is far more effective than a verbal conversation. Give the contractor a clear, reasonable deadline to return and fix items. Good contractors expect a snagging process and handle it professionally. If you are using a main contractor, carry out snagging for each trade before they leave site — it is much harder to get someone back once they have moved to another job.

Step 8: Building Control sign-off and the completion certificate

If your project required Building Regulations approval, you need a completion certificate before you can consider the job officially done. The Building Control officer makes a final inspection, checks the work against the approved plans and regulations, and — if satisfied — issues the certificate.

Do not skip this. A completion certificate is required when you sell the property, may be needed for insurance purposes, and demonstrates that notifiable work was done to the correct standard. If you sell without one and the work was notifiable, you may be required to open up and have it inspected retrospectively — at your cost.

Keep the certificate, along with all warranties (boiler, windows, electrical installation certificate), in a single safe place. You will need them again.

How RenoHub helps

A renovation involves dozens of moving parts across months. RenoHub's task list lets you set up every action in one place — flagging each task as DIY or professional so you can see at a glance what you need to book out and what you can handle yourself. The AI renovation advisor is available throughout the project: ask it to sense-check your sequence, think through a material choice, or draft questions for a contractor conversation. Your own OpenAI or Gemini key powers it, so nothing leaves your device.

The Wish list lets you save products and materials from any website as you browse — whether that is a specific tile from Topps Tiles, a kitchen tap from Screwfix, or a light fitting you spotted in a showroom. Each item tracks price and status by room, so when it is time to order you have everything in one place rather than scattered across browser tabs and email threads.

RenoHub also keeps your project documents — plans, contracts, warranties, certificates — in one archive. When Building Control asks for the approved drawings, or a future buyer asks for the completion certificate, you know exactly where to look.