Green growth on the facade
A green haze on the facade — especially on north- and shade-facing sides — is usually algae growth. On its own it doesn't directly damage the brickwork, but it retains moisture and thereby speeds up the aging of the paint layer or coating underneath.

Cause
Moisture that stays on the facade for long periods due to little sun and wind, for example on north-facing walls, behind planting or under overhangs, provides a breeding ground for algae and moss.
How to recognise it
- A green or dark green haze, often patchily spread
- Concentrated on north- and shade-facing sides or behind planting
- A damp, sometimes slightly slippery-feeling facade surface
What's the risk?
- Growth holds moisture against the facade for longer, causing the paint layer or coating to age faster
- Over time it can contribute to weathered joints or peeling paint
- It is also one of the most commonly reported aesthetic complaints about a facade
The solution
We professionally clean the facade to remove growth without damaging the substrate, and apply a protective, dirt-repellent finish where needed.
For persistently damp spots, we also advise limiting the cause where possible, for example by cutting back vegetation near the facade.
When painting is enough
If the underlying paint or coating is still in good condition, cleaning and possibly a protective aftertreatment is enough.
When repair is needed
If the growth has been present for a long time and the paint layer underneath is affected, facade maintenance or paintwork is needed in addition to cleaning.
How Painting Company solves it
- Assessing the cause and moisture situation
- Professionally cleaning the facade
- Repairing any underlying damage
- Protective finish against new growth
Preventing green growth and algae on the facade: practical maintenance
The best way to prevent green growth and algae on the facade is to regularly check the spots where the problem most often starts, and fix small defects straight away instead of waiting. Moisture that stays on the facade for long periods due to little sun and wind, for example on north-facing walls, behind planting or under overhangs, provides a breeding ground for algae and moss.
A fixed maintenance cycle — for example periodically touching up vulnerable spots such as sealant joints, corners and sills — is often cheaper than waiting until a problem shows up in full. Not sure whether your situation needs attention? A free, no-obligation inspection gives you clarity.
Why choose Painting Company
Painting Company has now completed over 1374 projects and serves more than 261 VvE's, with a team of 14+ permanent painters and an average Google rating of 4.9. With green growth and algae on the facade, it's not just about the visible paint layer but also the structural repair underneath — we have daily experience with exactly that.
As part of CrumBouw and GoedkoopSteigerHuren.nl, we can combine this with facade maintenance and, if the situation calls for it, scaffolding — all through a single point of contact. Request a free, no-obligation quote, and we'll think it through with you.
Frequently asked questions about green growth and algae on the facade
Does green growth always come back after cleaning?
Without a protective aftertreatment, growth can return over time, especially in shaded spots. A suitable coating slows this down considerably.
Is green growth harmful to the facade?
Not directly, but it does retain moisture, which speeds up the aging of the paint layer or coating.
Can I fix green growth and algae on the facade myself, or is this a job for a professional?
Small, surface-level cases can sometimes be touched up yourself, but if you're unsure we'd advise against it. We professionally clean the facade to remove growth without damaging the substrate, and apply a protective, dirt-repellent finish where needed. Repairs done incorrectly often end up costing more in the long run than calling a professional painter straight away.
How long does it take to fix green growth and algae on the facade?
That depends a lot on the extent and accessibility of the spot. For a limited, localised case the work is often done within a day or a few days; larger areas take longer. During the free assessment we give a concrete estimate for your situation.
What does it cost to fix green growth and algae on the facade?
That varies by situation — the extent, the accessibility and whether painting is also needed all play a role. We give a clear quote after a free, no-obligation assessment, so you know exactly where you stand beforehand.
What happens if I ignore green growth and algae on the facade?
Growth holds moisture against the facade for longer, causing the paint layer or coating to age faster The longer you wait, the bigger the eventual repair — and the cost that comes with it — tends to be.
What's the best time of year to have this addressed?
We prefer to carry out exterior work in dry weather at a moderate temperature, usually from spring to autumn. Repairing acute damage — such as cutting out rotten wood — can however often be done year-round, so the problem doesn't get worse while you wait for better weather.
How do I stop green growth and algae on the facade coming back after it's fixed?
We address not just the visible symptom but also the underlying cause — moisture that stays on the facade for long periods due to little sun and wind, for example on north-facing walls, behind planting or under overhangs, provides a breeding ground for algae and moss. Periodic maintenance also helps: touching up small damage in time prevents a small problem growing back into a bigger repair.
What materials and techniques do you use for this?
We work with professional materials and paint systems matched to the surface and the load it faces — not standard DIY-store paint. Where needed we combine that with specialised wood repair systems or primers matched to the specific cause.
Do you offer a guarantee on the repair work?
We always discuss guarantee terms upfront and set them out clearly in the quote, so you know exactly what to expect before we start.
Can you combine this with facade maintenance?
Yes, we combine this regularly. If we're already on site for facade maintenance, it's often more efficient to include this in the same schedule rather than planning it separately.
Is green growth and algae on the facade worse on older or listed buildings?
This comes up more often on older properties, simply because the woodwork and facades have been exposed to the weather for longer and often already carry several layers of paint. On listed-building details we work with extra care to preserve the original profiling and appearance.
How do I spot early signs, before it's visibly bad?
A green or dark green haze, often patchily spread
Is a visual inspection enough, or is more investigation needed?
In most cases a thorough visual inspection by a professional painter is enough to determine the extent. If there's doubt about the underlying structure, we look a little deeper, for example by gently testing whether the wood can still bear weight.
Do you also work on commercial buildings and real estate, not just homes?
Yes. We fix green growth and algae on the facade for private homes, VvE's and real estate such as commercial buildings and apartment blocks. The approach is similar, though larger properties are often planned in phases.
Can green growth and algae on the facade affect the value of my home?
Visible damage to window frames, facades or woodwork can create a negative impression during a sale or valuation and raise questions about deferred maintenance. Addressing it in time avoids that discussion and keeps the property looking well cared for.
Do I need to prepare anything before you come round?
No, that's not necessary. Just make sure the spot is reasonably accessible; we handle everything else, from inspection to execution.
Do you use scaffolding if the spot is high up or hard to reach?
If the situation calls for it, we arrange that through GoedkoopSteigerHuren.nl, part of the same organisation as Painting Company. We combine that into a single request, which saves coordination steps.
How quickly can you come round for an assessment?
We respond to requests quickly and schedule the assessment as soon as possible in consultation with you. Request a free, no-obligation quote and we'll get in touch.
What's the difference between touching up and a full repair?
If the underlying paint or coating is still in good condition, cleaning and possibly a protective aftertreatment is enough. If the growth has been present for a long time and the paint layer underneath is affected, facade maintenance or paintwork is needed in addition to cleaning.
Ready for your next project?
Request a free, no-obligation quote today. We get in touch, think along with you and deliver the best paintwork for your home, VvE or property.