Free instant estimate · no email required
What will your renovation cost?
Draw it. Price it. See it.
Pick your project and get an honest UK cost range straight away, including 20% VAT. Then draw bathrooms, kitchens and bedrooms to scale, check the rules and the plumbing, and see the room renovated with a free AI impression.
The journey walks with you from idea to handover, phase by phase, on your own device and without an account.
to £0
Built from published source ranges with dates · the same engine as the full calculator below.
Step through the full calculatorEvery question on one page: project, size, finish level and region, without leaving this page.
Draw it, price it, see it
Design your own house
Draw a whole house, see it in 3D and know what it costs
Design your own house is the free drawing board of RenovationStart: draw the floor plan of a whole house, see it in 3D and see what building it costs, from the same cost engine as the calculator. Have an image or a film made of your own model, and put the same house anywhere in the world.
The price is there as you draw
Every change in the drawing feeds into the building cost, from the same cost engine as the calculator, per item and with a range.
An image and a film of your own model
The AI image and the walk-through film follow the shape of the house you drew; a check compares every image with the model.
The same house anywhere in the world
See what building the same house costs in 218 countries and 26 cities, always with the source.
Start with an example
17 example houses, from tiny house to villa with pool: open one, change it and see every change in 3D.
Examples
What the reality check catches
UK national planning ranges including 20% VAT, calculated live for your own distances.
Moving a toilet about 2 metres
£930 to £2,040
Rerouting the soil pipe, floor opened and restored; drag it in the bathroom planner
Sink in a freestanding island
£700 to £2,010
Water, drain and power through the floor; test it in the kitchen planner
New washer hookup
£150 to £400
Close to existing water and drain lines; place it in the bathroom planner
Guides
Honest answers, before you commit
UK cost guides
UK planning & rules
The site
The calculator is free
My income comes from my own products, not from your data.
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Questions
Frequently asked questions
What does a bathroom renovation cost?
A full bathroom renovation at a mid-range finish sits at £5,500 to £8,500 in the Midlands, including 20% VAT. The calculator adjusts that range for your finish level and region, and shows the source behind it.
What does a new kitchen cost?
A full kitchen renovation at a mid-range finish sits at £10,000 to £18,000 in the Midlands, including 20% VAT. The biggest swing between two kitchen quotes is the units and appliances: in or out of the price, the total changes a lot.
What does a loft conversion cost?
A dormer loft conversion at a mid-range finish sits at £45,000 to £60,000 in the Midlands, including VAT. The calculator shows each conversion type with its own range, so you can see what the step up to a dormer or mansard costs.
What does a rear extension of 20 m² cost?
For 20 m² of rear extension at a mid-range finish, the Midlands range is £48,000 to £72,000, including VAT. Structure and groundwork carry most of that price, and the calculator prices your own size per square metre.
Do these prices include VAT?
Yes. Every range on this site includes 20% VAT, and the how-we-price page shows the source and the assumptions behind each project.
Do I need an account or email?
No. The estimate, the planners and the AI impression work without an account and without an email address. A free account exists for one job only: making your pack and saved work travel with you across devices.