What do Danish condition reports find most often, and what does it cost?
| Finding | How often (HUSDATA) | Cheap scenario | Expensive scenario |
|---|---|---|---|
| Bathroom: loose tiles, joints, membrane | red in 47 of 62 | DKK 2,000-8,000: new joints and silicone | DKK 80,000-180,000: new bathroom |
| Roof: cracks, flashing, ridge | red in 32 of 62 | DKK 5,000-30,000: individual sheets | DKK 300,000-470,000: new roof with asbestos, ~170 m² |
| Loft: ventilation, condensation, signs of animals | red in 13 of 62 | DKK 10,000-40,000 | more if the rafters are damaged |
| Windows and doors: old joints, door to garage | red in 13 of 62 | DKK 3,000-10,000: joints | tens of thousands: new windows |
| Water and drainage: floor drain, safety valve | red in 13 of 62 | a few thousand | tens of thousands: new floor drain with membrane |
| Garage, shed, carport | red in 13 of 62 | a few thousand | tens of thousands: new carport roof |
| Damp basement | in 6 of 63 | DKK 15,000-40,000: drying, draining water away | DKK 100,000-480,000: perimeter drain |
Frequency from HUSDATA 2026 (62 detailed reports). Prices are indicative: our reviews, Dansk Industri 2026 (roof), Bolius 2025 (drain), not contractor quotes.
A new bathroom can have a red item too. In our data we saw a floor drain raised with an extra frame that is not approved for it: a typical sign of do-it-yourself work. "Renovated in 2019" in the listing plus a red item in the report together mean: the work was done badly or by the owner.
What do Danish electrical reports find most often, and what does it cost?
| Finding | How often (HUSDATA) | What it means |
|---|---|---|
| At least one "illegal installation" | 54 of 55 electrical reports | not done to the rules, often DIY |
| Sockets without working earthing | 37 of 63 houses | risk of electric shock |
| Fire risk | 41 of 55 electrical reports | fix before you move in |
| Power supply could not be located | 14 cases | hidden wiring, not checked |
Most items take a few hours of an electrician's work. But the whole list easily runs to a few thousand, and more if you need new earthing or a new fuse board. Ask an electrician to price your specific list.
"illegal" does not mean "dangerous". And the reverse: the most dangerous items are often under "fire risk", not "illegal". Read the categories of the items, not their number.
Oil tank and soil contamination: from-to
| Scenario | Price |
|---|---|
| Empty, clean, fill with sand | DKK 3,500-6,500 (Bolius) |
| Remove a tank from the basement | DKK 5,000-9,000 (Bolius) |
| Dig up and remove a buried tank | DKK 9,000-30,000 (Bolius) |
| Cleaning contaminated soil | from tens of thousands; in an extreme case in Aarhus an estimate of DKK 7-8 million (Ingeniøren) |
| Extended ejerskifteforsikring with contamination | covers up to DKK 500,000 in an offer we have seen (2026) |
It is often the pipe, not the tank itself, that causes the most trouble. An illegal or damaged pipe from the tank to the house can leak for years: in Aarhus, illegal pipes were found at about one in four newer tanks with buried pipes (Ingeniøren). Do not just ask "where is the tank?" but also "where did the pipe run into the house?".
Read more: Buying a house with an oil tank →
What do insulation and energy improvements cost, and what pays off?
| Measure | Price (Bolius) | Payback |
|---|---|---|
| Cavity wall insulation | about DKK 17,000 | 2-4 years |
| Loft insulation | about DKK 26,000 | 7-10 years |
| Heat pump instead of an oil boiler | DKK 100,000-150,000 | 3-7 years |
| Solar panels 6 kW | about DKK 110,000 | 10-12 years |
| Energy-efficient glazing, 30 m² | about DKK 40,000 | 12-15 years |
| Ventilation with heat recovery | DKK 60,000-80,000 | saves 15-25% of heating |
| External wall insulation, 50 m² | about DKK 160,000 | 16-20 years |
| New energy label | DKK 7,226-8,786 (2026) | required when selling |
Read more: How to improve the energy label →
What do damp-proofing, mould removal, radon and sewer work cost?
| What | Price | Source |
|---|---|---|
| Perimeter drain and foundation insulation | DKK 2,500-12,000 per running metre | Bolius, Molio prices 2025 |
| Mould removal on a small area | a few thousand kroner | quotes on Handyhand |
| Mould in the structure | many times more: new materials, ventilation | needs a professional assessment |
| Radon measurement | DKK 500-1,300 | Bolius via Tænk |
| Radon extraction system | DKK 15,000-75,000 | Tænk |
| Sewer TV inspection, ~10 m | DKK 1,800-9,000 | quotes on Handyhand |
By law the tilstandsrapport does not check radon, the sewer or mould behind cladding. In our data radon is not mentioned in a single one of 63 reports. So "nothing found" here means "nobody looked".
Small things that add up to a big sum
Items that are rarely red but almost always in the reports, and almost always yours:
- joints around windows and doors that have lost their elasticity;
- gutters and downpipes, blocked or cracked;
- wooden facades and bargeboards that need painting every few years;
- the door between garage and house without a fire rating: a cheap item, but it is about safety.
Nobody counts the grey items ("minor damage") in a negotiation, because each one is small. But many reports in our data have 7-16 of them, and together they easily add up to tens of thousands. Put them in your first-year budget.
My view
I always price repairs in two scenarios and never take the middle. The cheap scenario is for negotiating, the expensive one for the budget. If you can only "carry" the house in the cheap scenario, you cannot afford it.
Yurii Khlivnenko, founder of NordIndsigt
On your own or with us?
You can collect the prices yourself from Bolius, DI and contractor quotes if you have a couple of weeks and Danish. We have seen these items in dozens of reports and know when "red" means DKK 3,000 and when it means DKK 150,000. And when you like the house, you want to believe in the cheap scenario. With us you get a list of repairs for your house with two prices.
What will your house cost?
BoligCheck lists the repairs in your house with two prices: a cheap and an expensive scenario.
Order BoligCheck, DKK 299Frequently asked questions
What do Danish condition reports find most often, and what does it cost?
Frequency from HUSDATA 2026 (62 detailed reports). Prices are indicative: our reviews, Dansk Industri 2026 (roof), Bolius 2025 (drain), not contractor quotes.
What do Danish electrical reports find most often, and what does it cost?
Most items take a few hours of an electrician's work. But the whole list easily runs to a few thousand, and more if you need new earthing or a new fuse board. Ask an electrician to price your specific list.
What do insulation and energy improvements cost, and what pays off?
Read more: How to improve the energy label →
What do damp-proofing, mould removal, radon and sewer work cost?
By law the tilstandsrapport does not check radon, the sewer or mould behind cladding. In our data radon is not mentioned in a single one of 63 reports. So "nothing found" here means "nobody looked".
On your own or with us?
You can collect the prices yourself from Bolius, DI and contractor quotes if you have a couple of weeks and Danish. We have seen these items in dozens of reports and know when "red" means DKK 3,000 and when it means DKK 150,000. And when you like the house, you want to believe in the cheap scenario. With us you get a list of repairs for your house with two prices.
