1
How dirty the roof is
Dust and pine needles come off quickly, but older moss, algae and lichen take more time and may need a treatment product.
2026 price guide
Metal roof washing cost
Metal roof washing is often the right first maintenance step when the roof has dirt, pine needles, algae or moss. The total depends mainly on the roof size, how dirty it is, how easy it is to access and whether gutter cleaning or anti-moss treatment is done at the same time.
Washing a low-slope 200 m² metal roof starts from about 790 euros.
The final price depends on roof height, steepness, dirt, access and any protection or extra work required.
Cleaning is also the first step before metal roof maintenance painting.
Metal roof cleaning prices by size
This table is for metal roof washing. The cost becomes clearer once the roof dirt, moss, number of slopes, water access, walking routes and possible extra work are known.
| Roof size | Estimated washing cost | Typical situation | Notes |
|---|---|---|---|
| Under 100 m² | 440 € | Small low-slope roof | For example, a storage building, cottage or small detached house |
| Around 150 m² | 610 € | Typical low-slope metal roof | A standard detached house roof |
| Around 200 m² | 790 € | Larger low-slope roof | Easy access and working conditions |
| Around 300 m² | 1,050 € | Large low-slope roof | Easy to wash |
2
Cleaning method
On a metal roof, the pressure level, washing direction and working method need to be chosen so seams, penetrations and the existing finish are not stressed unnecessarily.
3
Work done at the same visit
Gutter cleaning, anti-moss treatment, a light condition check or washing before painting are often sensible to do on the same visit.
What does the price usually include?
- A visual roof check before washing starts.
- Removal of loose debris and visible dirt.
- Metal roof washing with a suitable pressure level and method.
- Cleaning product or moss treatment where agreed.
- Basic clean-up of splashes and access routes after the work.
What is usually not included in the base price?
- Metal roof maintenance painting.
- Larger repairs such as replacing sheets or fixing the underlay.
- Renewing roof safety products.
- Special lifts or unusual safety arrangements if required.
- Replacing the rainwater system unless agreed separately.
A practical note: washing does not always mean painting is needed
!
If the paint surface is still sound, washing may be all the roof needs. If old coating starts lifting during cleaning, rust is visible or the colour has worn through, the wash also helps show that the roof should be assessed for maintenance painting.
Roof washing, moss removal or anti-moss treatment?
Roof washing removes visible dirt and loose growth. Moss removal usually means brushing or washing away heavier build-up. Anti-moss treatment is a separate step used to slow down new growth after cleaning.
If the roof only has light dirt, a standard wash is often enough. If moss has been sitting on the surface for years, the work takes longer and follow-up treatment can be worth doing.
Metal roof washing and household tax deduction
Roof cleaning can in some situations count as maintenance work for a home, which means the labour share may qualify for household tax deduction. It is always worth checking the current rules directly from the Finnish Tax Administration.
€
It helps when the quote separates labour, treatment products and extras, because that makes the deduction easier to assess.
Roof cleaning and related maintenance work
These services can often be assessed or completed during the same visit.
Metal roof cleaning
- Metal roof washing cost
- Roof cleaning
- Pressure washing with the right pressure
- Cleaning before painting
Growth treatment
- Moss removal
- Anti-moss treatment
- Algae and lichen treatment
- Loose debris removal
Extra work
- Gutter cleaning
- Rainwater channel washing
- Checking roof penetrations
- Small condition notes from the roof
Next step
- Metal roof painting
- Roof coating
- Roof condition check
- Maintenance painting
Want to know whether washing is enough?
Send photos from a few angles and a couple of close-ups of the dirtiest parts. In many cases that is enough to tell whether the roof only needs cleaning or whether painting should also be considered.
Frequently asked questions
How much does washing a 200 m² metal roof cost?
Washing a low-slope 200 m² metal roof starts from about 790 euros. Steepness, dirt, access and any agreed extra work affect the final price.
What is the usual cost per square metre?
For a larger, low-slope metal roof that is easy to wash, the starting price is about 3.50 €/m². Steepness, dirt and difficult access increase the total.
When is washing alone enough?
Cleaning alone is often enough when the paint surface is still sound and there is no widespread rust or flaking. If the finish is clearly worn, washing is still a sensible first step before assessing painting.
Can I wash a metal roof myself?
Light dirt can sometimes be handled yourself, but safe movement on the roof, pressure use and care around seams and penetrations all require caution. Safety comes first.
Is it worth cleaning gutters at the same time?
Usually yes. Dirt washed off the roof often ends up in the gutters, so cleaning gutters and downpipes is a natural add-on.
Is washing needed before metal roof painting?
Yes. Metal roof painting needs a clean surface. Dirt, grease, moss and loose old coating all weaken adhesion.