For Dutch homeowners · in English and Dutch
Is your renovation worth it?
Enter your address and see what a dormer, extension, heat pump or solar panels will cost, what they add to your home's value, and what to do first.
How it works
- 01
Enter your address
We pull floor area, build year and your roof's shape from public registers, so you don't have to look anything up.
- 02
Pick your projects
Up to five, with a few short questions about size and finish.
- 03
Get your verdict
Do it, skip it, or do something else first — with a value-uplift range for every project.
Free verdict or full report
The verdict is free. The full report gives you the numbers to decide, to finance the work and to hire someone.
| Per project | Free verdict | Full report · €39 (early-bird €29) |
|---|---|---|
| Verdict: do it, skip it or in which order | Yes | Yes, with reasoning |
| Value uplift | Range | Range, method and confidence |
| Cost | Typical range | Budget / typical / premium, with line items |
| Subsidies for your address | How many | Amounts and how to apply |
| Permit check | Not included | Permit-free or not, and what to do next |
| Financing | Not included | Monthly cost, payback period and present value |
| Energy label and savings | Label step | Label step and yearly savings in euros |
| Heritage status | Not included | National monument or protected townscape |
| Order of work | Best first step | All projects ranked |
| Job brief for quotes | Basic | Full, with measurements and budget |
| Report as a PDF | Not included | Included, for your mortgage advisor too |
Pricing
Free verdict
€0
- A verdict per project, with no email address
- Typical cost and value uplift as ranges
- Best first step and the energy-label step
Full report
One-time · up to 5 projects
€29€39
Early-bird price for the first 100 buyers
- Cost per line item, at three levels
- Subsidies and permits for your address
- Monthly cost, payback period and present value
- Recommended order of work
- A PDF and a job brief for quotes
iDEAL | Wero, card or Apple Pay
Not useful? Your money back, on request. Our own guarantee, alongside your statutory rights.
Ready to build? Get quotes with a ready-made brief
Your report becomes a job brief with measurements, budget and scope. Send it to tradespeople through our quote partners and compare like for like.
Quote requests are free for you. We may receive a fee from quote partners; it never changes a verdict.
Numbers you can check
Ranges, not single guesses
Every amount comes with a low, typical and high value, and a confidence grade with it.
Public data underneath
Building data from the Kadaster BAG, your energy label from EP-Online, your roof's shape and faces from 3DBAG, neighbourhood figures from CBS, and heritage status from the Cultural Heritage Agency. Costs from published price guides, subsidies from the ISDE scheme.
Independent verdicts
No builder pays for a better verdict. If a project does not pay for itself, the report says so.
Questions
Is this a valuation?
No. It is an indication based on public data and published research. For a mortgage you still need a registered taxateur; the full report does give reasoning your advisor can use.
Where does the data come from?
The Kadaster BAG for floor area and build year, EP-Online for your registered energy label, 3DBAG for your roof's shape and the orientation of its faces, CBS for home values in your neighbourhood, and the Cultural Heritage Agency for heritage status. Costs come from published price guides and subsidies from the ISDE scheme.
How do you know my energy label?
From EP-Online, the official register of registered energy labels kept by RVO. If no label is registered for your address we derive it from the build year, and the report says that we estimated it.
Does it work for apartments and new builds?
For most projects, yes. In an apartment, work on the outside usually needs the owners' association to agree, and the report says so.
What changed now that netting has ended?
Since 1 January 2027 you can no longer offset electricity you feed back against what you use. Electricity you use yourself is therefore worth far more than electricity you export, and the verdict for solar panels and a home battery is calculated that way.
Can I use it in English?
Yes. Every page and every report is available in English and Dutch.
My project is not listed. What now?
Tell us what you are planning. We add projects based on what people ask for most.
Mortgage advisor, estate agent or platform?
Offer renovation verdicts to your clients under your own brand, through report credits or an API.