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How much do home renovations cost?

Ready to start budgeting for a home renovation project? Let’s take a look at the costs involved.

Guest Author
Words by: Annabel Dixon


With inflation still running high, builders in hot demand and materials sometimes in short supply, home renovators are finding themselves shelling out a lot more for projects now than they did pre-pandemic.

Mike Fairman, CEO at Checkatrade, says: "Inflation is really biting the price of home improvement and is big a contributing factor to the price increases we’re seeing, as the cost of raw materials continues to soar."

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So how do you manage to stick within a planned renovation budget?

Preparation, preparation and even more preparation is the key. Here's what we recommend:

  • Get at least 3 quotes for the work - and make sure they're in writing

  • Check how long the quote is 'held' for, so there aren't any nasty surprises

  • Always ask for a suppliers' 'best price' when buying materials

  • Have a good contingency fund of 10-15% in place

  • Ensure you book tradespeople in the right order to avoid multiple call-out charges

  • Reuse materials - can you sell items rather than chuck them in a skip?

How much does a full home renovation cost?

As a rough guide, Checkatrade estimates it will cost between £76,900 and £138,800 to fully renovate a three-bedroom house.

Let’s break that down.

Architects' fees

Do you need the services of an architect?

If the work is major and involves structural changes to your home, the answer is probably yes.

If the work is relatively minor and doesn't involve extending your property or knocking down walls, you may just need a structural engineer or a builder you can trust.

Architects’ fees are generally charged as a percentage of the total cost of the project. 

They typically range from 10% to 15% of the total construction costs, depending on the project’s size, complexity and budget.

For very complex projects, fees can be as high as 20%.

For straightforward ones, some architects may be happy to offer a fixed fee, while others may charge an hourly rate.

When do I need to use an architect? 

How much does a kitchen renovation cost?

The average cost of a kitchen renovation, excluding fixtures and fittings such as kitchen units, worktops and appliances, is £20-30,000, according to HiF Kitchens.

At the lower end of the spectrum, for a small galley kitchen using low-cost units, a kitchen can be installed for around £3,000, with units costing around £2,950.

At the higher end, a top-of-the-range kitchen can cost upwards of £20,000, with installation costs running upwards of £7,000.

Bear in mind that this doesn’t include worktops, appliances, rewiring, plumbing adjustments and replastering costs.

Worktops can range from £500 at the cheaper end to several thousand pounds for the granite and quartz options at the higher end.

You’ll also want to think about flooring, splashbacks, tiles and lighting.

How much does a bathroom renovation cost?

The average cost of a bathroom renovation ranges from £5,000 to £10,000, according to, though prices can be higher in London and the South East.

Here’s how that breaks down: 

  • Bathroom suites - £1,000 to £3,000+

  • Installation costs -  £7,200+

  • Removal of the old bathroom £500+

  • Installation of tiles, taps, towel rails and sealing - £2,000+

Bear in mind that design plans and underfloor heating will all add to the bill.

How much does a loft conversion cost?

The average cost of a loft conversion is £50,000, according to

There are five different types of loft conversions available, from the simplest room installations to the top-of-the-range versions.

Let's take a look.

1. Room in loft conversion - £22,500 - £30,000

This is the easiest and cheapest way to convert a loft, and involves inserting windows into the existing roof without changing the structure of the building.

2. Dormer loft conversion - £40,000 - £60,000

A popular option for terraced houses, a dormer conversion involves adding a ‘box’ to the back of the house to expand the loft space.

3. Hip to gable loft conversion - £50,000 - £70,000

Usually found on semi-detached homes with sloping roofs, a hip to gable extension extends the slope of the roof to create a straight wall at the edge and adds a dormer to the rear of the property.

4. Mansard loft conversion - £50,000 - £80,000

A mansard loft conversion is like a dormer conversion but it has a sloping roof to soften the look from the outside.

Mansards are often used when dormers are not deemed suitable. For example if you’re struggling to get planning permission because a local authority doesn’t like dormer conversions, your home is in a conservation area or it’s a listed building. 

5. Bungalow loft conversion - £62,500 - £87,500

All of the above conversions can be done in a bungalow if the building is suitable and planning permission is granted.

How much does an extension cost?

An extension can range from £30,000 for a small, single-storey addition on a budget, to £275,000 for a large, two-storey extension, according to

Let’s take a look at the average costs.

Small story single extension (20 sqm)

  • Mid-range: £30-£44,000

  • Luxury: £46-£50,000

Medium single story extension (30 sqm)

  • Mid-range: £45-£66,000

  • Luxury: £69-£75,000

Large single story extension (50 sqm)

  • Mid-range: £75-£90,000

  • Luxury: £110-£125,000

How much does a garage conversion cost?

The estimated cost of converting a garage could vary from £13,000 through to £54,000, according to the size and type of garage you’re converting, according to HomeHow.

Garage typeSizeCost
Integralsingle£13,000 - £18,000
Integraldouble£27,000 - £36,000
Kitchen conversionsingle/double£10,000 - £20,000
Bathroom conversionsingle/double£2,700 - £7,000
Living room conversionsingle/double£6,000 - £7,000
Double conversiondouble£27,000 - £36,000

How do you budget for a home renovation?

When planning a renovation, you’ll need to tally up your entire costs and add in a contingency flex of around 10-15% of the total.

Costs to think about:

  • Architect fees

  • Planning permission fees

  • Building regulations fees

  • Structural engineer fees

  • Material costs

  • Building costs

  • Plumbing costs

  • Electrical costs

  • Fixtures and fittings costs

  • Flooring costs

  • Tile costs

  • And if you need to leave the home while the work is taking place: renting costs

While price is an important factor when renovating, a good recommendation is golden.

Trust your gut. If something doesn’t feel quite right when someone is offering a quote, it’s important to follow your instincts.

A good rapport with your tradespeople is essential for the smooth running of a project. 

We try to make sure that the information here is accurate at the time of publishing. But the property market moves fast and some information may now be out of date. Zoopla Property Group accepts no responsibility or liability for any decisions you make based on the information provided.