What will your renovation cost?

Design your extension, roof extension or dormer in 3D and see your guide price straight away.

1. Choose your project

Select a type of renovation to calculate your indication.

Read more about what we do

The calculator gives a guide price. For details, examples and our approach per service, see the relevant page.

Full home renovationFrom teardown to turnkey by one dedicated team, with one point of contact.Home extensionMore living space, from foundation to finish.Roof extensionA full extra floor on top of your home.DormerMore space and light in your loft.Bathroom renovationComplete and fully watertight.Kitchen renovation (building work)From strip-out and pipework to installation.PlasteringWalls and ceilings smooth or ready to paint.Window framesuPVC, timber or aluminium with HR++ or triple glazing.Home insulationRoof, floor and walls, also without a renovation.Facade renovationPointing, brickwork repair, cleaning and protection.CarpenterStairs, made-to-measure cupboards, walls and doors: priced per job.View recent projects →A selection of the work we have completed recently.
Price guide

Guide prices per service in 2026

Per unit, including VAT, for Rotterdam and the Randstad. For every project, the condition of the home, access and your choices decide where you end up within the range.

ServicePerBasicMid-rangePremium
Full home renovationm² floor area€ 800 – € 1,100€ 1,100 – € 1,600€ 1,600 – € 2,400
Home extensionm²€ 2,000 – € 2,500€ 2,500 – € 3,300€ 3,300 – € 4,400
Roof extensionm²€ 2,200 – € 2,900€ 2,900 – € 3,800€ 3,800 – € 5,000
Dormermetres wide€ 2,900 – € 3,600€ 3,600 – € 4,600€ 4,600 – € 5,800
Bathroom renovationm² bathroom€ 1,050 – € 1,450€ 1,450 – € 2,000€ 2,000 – € 2,900
Kitchen renovation (building work)m² kitchen area€ 330 – € 600€ 650 – € 1,200€ 1,100 – € 2,200
Plasteringm² wall and ceiling€ 18 – € 28€ 25 – € 38€ 45 – € 80
Window framesframe€ 900 – € 1,300€ 1,250 – € 1,800€ 1,800 – € 2,600
Home insulationm² to insulate€ 30 – € 60€ 70 – € 110€ 110 – € 170
Facade renovationm² facade€ 45 – € 70€ 70 – € 115€ 150 – € 300
How the calculator works

What determines the price of a renovation?

Size and unit

We calculate per unit that fits the job: square metres for an extension or bathroom, metres of width for a dormer, the number of frames for new windows. Larger jobs are often slightly cheaper per unit because fixed costs such as scaffolding and preparation are spread.

Finish level

The biggest difference is in your choices: standard tiles or natural stone, prefab or bespoke, uPVC or timber. That is why every service shows three levels. Most of our clients end up around mid-range.

The condition of the home

Older homes often bring extra work: uneven floors, old pipework, rot or a foundation that needs attention. We only see that properly during a visit. Any extra work is always discussed beforehand, never afterwards.

What is not included

Permit fees, a structural engineer (unless chosen as an option), moving or storage, and loose furnishings. For jobs that need a permit, we are happy to take care of the drawings and application.

Questions about the cost calculator

How reliable is the cost calculator?
The amounts are guide prices for the Randstad in 2026 and give a realistic range. Your final price depends on the condition of your home and your choices, which we establish during a visit. You then receive a quote with a clear price agreed up front.
Do the amounts include VAT?
Yes, all amounts in the calculator include 21% Dutch VAT. For the labour on insulation work in homes older than two years the reduced rate may apply; we process that in the quote.
What does a dormer cost?
For a three-metre dormer, made to measure and properly finished, expect an amount around the mid-range level in the calculator. Prefab uPVC is cheaper; built on site with zinc or timber costs more. Interior finishing and any permit come on top.
What does an extension cost per m²?
Extensions are usually budgeted per square metre. Small extensions cost more per m² because the foundation, roof and connection to the house are always needed. Sliding doors, a roof light or opening up the rear wall are options.
Why is a small bathroom more expensive per m²?
Because strip-out, pipework, drainage and the sanitaryware are largely fixed costs. Whether the bathroom is four or eight square metres, it still gets a shower, toilet and basin.
Can I get a subsidy?
For insulation and some energy-saving measures the Dutch ISDE subsidy may apply. The calculator works without subsidies. Check the current conditions with RVO.
What happens when I send the estimate?
We usually get in touch within one working day, ask a few questions and plan a visit. You then receive a quote. No obligation.
My job is not in the list?
The calculator covers our most requested services. For carpentry, a load-bearing wall, a staircase or a combination of jobs we are happy to prepare a tailored quote. Just get in touch.