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How to Estimate Building Costs for Home Improvements

What is ‘home improvement’?
‘Home improvement’ is the general term for all renovation and remodelling work and covers any project that aims to alter the structure of an existing home. This could be to make your home more spacious; comfortable; modern; functional; energy efficient etc.

Cost factors to take into consideration
Many, many different factors can affect the cost of home improvement projects based on answers to questions such as:

  • Does the property need extra bedrooms/bathrooms?
  • Is the kitchen size adequate? Are you going to have a new kitchen?
  • Are you putting in large bi-folds or sliding doors?
  • Do the rooms flow? Do you need to knock down walls and restructure the room layout?
  • Is there usable roof space? Are you putting in big roof lights?
  • Is an extension required?
  • Will you need a new boiler? Or new radiators?
  • Are you redoing the floor throughout the house and having underfloor heating?
  • What kind of floor finish do you want?
  • For more information and examples of costs relating to more intense renovation work (such as stabalising buildings, dealing with damp and decay, replacing plumbing, wiring, heating systems etc) see ‘How Much Does It Cost To Renovate A House

Typically if you worked out a square meter at £1500, that's a good base price for the cost of an extension.

Standard Costs

Building Work
Typically if you worked out a square meter at £1500, that’s a good base price for the cost of an extension. To redesign an existing interior layout, budget from £500 to £900 per square meter.

There are many suppliers and prices for fixtures so you can pick your price point and search online to get an idea of cost. You can even go to IKEA and get a carpenter to fit your IKEA cupboards and make them permanent so they don’t look like IKEA furniture


  • Flooring/floor tiles
    • Vinyl flooring – Budget from £10 per square metre
    • Natural materials (stone/wood) – Budget from £20 to £100 per square metre
  • Wall finishes and painting/tiles – Budget from £85 per square metre

Again, for finishings like tiles on floors, tiles in bathrooms, etc. you can go to Topps Tiles, Porcelanosa or these kind of places and get prices per square meter and then associate that with how many square meters in your bathroom or on the wall. You can do it quite roughly and it’s a pretty good guide.


  • Heated towel rail/radiator
  • Underfloor heating – Budget from £10,000 to £15,000
  • New Boiler – Budget from £2,000 to £3,000 depending if the boiler is being fitted in an existing or new location


  • Lighting

Labour Fees

  • Plumber – Budget from £150-£200 per day
  • Electrician – Budget from £150-£200 per day
  • Carpentry – Budget from £120-£150 per day
FREE GUIDE: Category: Home Extensions
FREE: Home Extension Cost Guide

Inside this easy to ready free guide, you will learn how much extensions, loft conversions and other renovations to your home are typically priced.

Interior Home Improvement Projects

Bathroom Remodel

Budget around £5,000 assuming you can connect to existing pipework


  • Toilet – Budget from £60
  • Basin – Budget from £40
  • Twin basins – Budget from £300
  • Taps – Budget from £30
  • Fitted bath – Budget from £70–£500
  • Freestanding bath – Budget from £400
  • Bath & shower – Budget from £140–£700
  • Shower – Budget from £60–£300
  • Large walk-in shower – Budget from £200–£500

Kitchen Extension

Budget from £7,000 to £15,000 – the biggest cost factor is the appliances

Bi-fold or Sliding Doors

Budget from £1,500 to £2,000 per linear metre


  • Kitchen units – Budget from £350 per unit
  • Cabinet doors and drawers
  • Kitchen worktops
    • Laminate – Budget from £50 per square metre
    • Granite – Budget from £200 per square metre
    • Stainless steel – Budget from £250 per square metre
    • Marble, Quartz, composite stone – Budget from £350 per square metre


  • Oven / Range
  • Hob
  • Hood / Extractor
  • Microwave
  • Fridge / Freezer
  • Sink and Tap
  • Dishwasher
  • Washing Machine / Tumble Dryer

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Exterior Home Improvement Projects

New Cladding

  • Composite cladding – Budget from £105 per square metre
  • Hardwood timber cladding – Budget from £90 per square metre
  • Masonry paint (three coats) – Budget from £15 per square metre

Roof replacement

  • Changing your roof covering – Budget from £40 to £80 per square metre
  • Replacing concrete roof tiles – Budget from £28 to £35 per square metre

Replacing Windows & Doors

Replacing external windows and doors will cost at least £2,500-3,000 for a typical three bedroom semi-detached house.

PVCu double glazed windows will cost from £250-£400 each and the same again for fitting. A new door will cost £250-£2000 plus £100-£200 for installation.

Calculating Your Home Improvement Cost

Unless you have a lot of information and detail about what your home improvement involves/requires, it can be quite difficult to calculate a cost – there are so many contributing factors, which differ from project to project. Essentially, you need to create a bit of a scheme before you can start putting some numbers to it otherwise, there’ll be too many questions to answer.

To calculate the cost of your renovation, Yoop Architects take a measured survey of your property, which captures all the information. Then we draw it all up in 3D and create sketches to show sometimes five or six options if it’s not entirely clear how you want to achieve your brief.

A lot of the times there are different ways of achieving your desired result and the more you work with the building, the cheaper, easier and faster your build will be. Once you’ve got a favorite scheme or a couple of favorite schemes, we have a phase called ‘Meet the Builders’. That’s when we can introduce you to a couple of builders, they visit the property and they give you a ballpark figure. They’ll also go through any twists and turns of what might be in the grounds or any concerns that they have.


Thinking of your dream home improvement or how to start your project? 
Need your planning questions answered? Talk to an expert today.
Book a FREE 20 Minute Call with one of our home improvement Architects.

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