Recurring black mould spreading across a UK bathroom ceiling around the extractor grille, with condensation on the tiles and window
The most common call we get in Central Scotland: a bathroom ceiling that keeps going black.

Condensation · Mould · Ventilation · Central Scotland

Bathroom ceiling going black?

You clean it. You paint it. It comes back.

  • Steamy mirrors that stay wet for ages.
  • Wet walls, wet tiles, water on the sills.
  • Black mould on the silicone, the ceiling and the window.

It isn't because you don't clean. It keeps coming back because the moisture in that room has nowhere to go. Damp Solve solves that.

If the problem isn't condensation, we'll tell you straight. We won't sell you a fan to cover up a leak or a building defect.

Sound familiar?

That's my bathroom

If you recognise any of these, the mould isn't the problem. It's the sign of one.

Black mould spreading across a bathroom ceiling above a shower

Black mould across the ceiling

Above the shower, in the corners, creeping out from the fan.

A bathroom mirror still fogged with condensation running down it long after a shower

The mirror is still wet

An hour after the shower, everything is still streaming.

Black mould growing along the white silicone sealant at the edge of a bath

Black silicone and grout

Scrubbed, bleached, replaced — black again in weeks.

Condensation running down a window with water pooling on the sill

Water running down the walls and windows

Wet tiles, wet sills, puddles you mop up every morning.

A steamed-up bathroom with a fogged mirror and an old wall extractor fan

The bathroom stays wet for ages

The fan whirrs away and the steam just sits there.

Black mould returning in the cold corner of a bedroom wall

Black corners spreading beyond the bathroom

Landing, hall cupboard, the bedroom wall next door.

You've already tried

  • Cleaned it off
  • Bleach and mould spray
  • Repainted the ceiling
  • Left the window open
  • Turned the heating up
  • Bought a dehumidifier
  • Replaced the silicone
  • Left the old fan running longer

And it still comes back.

Cleaning removes what you can see. It doesn't stop what's making it come back.

Some of those things help a little, for a while. None of them change how much moisture that room holds after every shower, or how long it sits on cold surfaces afterwards. That's what has to change for a recurring problem to actually stop.

Find my solution

In plain English

Why it keeps coming back

No jargon. This is the cycle happening in your bathroom every single day.

  1. 01

    You have a shower

    A single shower releases litres of water into the air as vapour. You can see it on the mirror.

  2. 02

    The moisture fills the room

    Warm, wet air spreads across the ceiling and into every corner, and out onto the landing.

  3. 03

    It lands on the cold surfaces

    If it isn't removed effectively it condenses on the coolest surfaces — ceiling, silicone, tiles, window reveals.

  4. 04

    Mould grows there. Again.

    Those damp surfaces are exactly where mould grows, which is why it returns in the same spots.

Break that cycle and the mould has nothing to grow on.

It rarely stays still

This is how it starts

Early condensation problem: a small patch of mould in a bathroom ceiling corner and condensation beads on the window frame

This is how it starts

A bit of black in the corner

  • · A few spots on the ceiling above the shower
  • · Grey specks appearing in the silicone
  • · Beads of water on the window frame each morning
  • · A faint musty smell when you open the door
Advanced condensation damage: peeling ceiling paint, dark mould staining across the corner and blackened window reveals

Left untreated, this is where it can end up

Staining, peeling and spreading

  • · Mould across whole ceilings and wall corners
  • · Paint blistering and peeling off damp plaster
  • · Blackened window reveals, frames and beading
  • · Decoration and plaster that now needs making good

The earlier the conditions are corrected, the less there is to put right afterwards.

The good news?

It can be solved.

This is a solvable problem, and it's what we do all day. Damp Solve supplies and installs practical condensation, ventilation and moisture-control solutions that remove the moisture properly and keep those surfaces dry — so the mould has nothing to come back to.

  • You don't need to work out what to buy or which system you need.
  • You tell us the room and what you're seeing. We recommend the solution.
  • We supply, install and commission it, and treat existing mould where appropriate.
  • If something other than condensation is at fault, we'll tell you straight.
A modern continuous extract ventilation unit installed in a bathroom by Damp Solve

Find my solution

Tell us what's happening. We'll tell you the solution.

Answer some guided questions about the room and what you're seeing, add the measurements and photographs we ask for, and Damp Solve will recommend the appropriate solution for your home — then we attend and install it.

  1. 01

    Answer the questions

    Plain questions about the room, the steam, the mould and your existing extractor.

  2. 02

    Add photos and measurements

    Photographs of the affected areas, windows and existing ventilation.

  3. 03

    Get your recommendation

    We recommend the appropriate solution and the price for your home.

  4. 04

    We install it

    Happy with it? Book online and we attend to install and commission it.

Your recommended solution is based on the information, measurements and photographs you provide. Please make sure they are accurate and complete, as your solution and price will be based on them.

Not just bathrooms

What else we solve

Bathrooms are the most common call, but condensation and mould turn up all over the house.

Condensation streaming down a window pane in a Scottish home

Wet and streaming windows

Puddles on the sills every morning and blackened beading.

Black mould in the cold corner of a bedroom wall

Bedroom condensation and mould

Black corners on the cold external wall, on curtains and blinds.

Black mould on a bedroom wall behind a wardrobe pulled away from it

Mould behind furniture

Behind the wardrobe, on the wall, on shoes and clothes.

A damp cold room with mould on the wall and a condensation-covered window

Musty, cold rooms

A room that never feels dry, with a smell that never clears.

Black mould keeps coming back after cleaning

Wiped down, repainted, and back on the same wall or corner within weeks.

Bathroom ceiling or walls going black

Mould spreading across the ceiling, sealant and grout no matter how often it's cleaned.

Windows soaking wet in the morning

Puddles on the sills and water you have to mop up before you open the curtains.

Condensation running down the glass

Steamed-up windows all winter, with damp frames and blackened beading.

Mould in bedroom corners and behind furniture

On the cold external corner, behind the wardrobe, on curtains, shoes and clothes.

A musty smell that never clears

That damp smell in a bedroom, cupboard or hallway, even after airing it out.

The bathroom stays wet long after a shower

Mirrors and tiles still streaming an hour later — a sign the extraction isn't shifting the moisture.

The extractor fan isn't coping

Noisy, weak, only on with the light, or not properly ducted to outside at all.

Service area

Condensation and mould solutions across Central Scotland

Coverage is deliberately focused so we can attend quickly and come back to commission the work properly.

We work in Glasgow and across Lanarkshire — Hamilton, East Kilbride, Motherwell, Bellshill, Wishaw, Blantyre, Cambuslang and Rutherglen — plus Renfrewshire and East Renfrewshire, Ayrshire, Falkirk and Stirling. Scottish housing stock fails in different ways: sandstone tenements, post-war semis and terraces, ex-local-authority flats and airtight new builds where the ventilation was never commissioned. We specify the solution around the property in front of us.

  • Glasgow
  • Lanarkshire
  • East Kilbride
  • Motherwell
  • Hamilton
  • Renfrewshire
  • East Renfrewshire
  • Ayrshire
  • Falkirk
  • Stirling

Common questions

Bathroom mould and condensation, answered plainly

The questions householders across Central Scotland ask us most.

Why does the black mould on my bathroom ceiling keep coming back?

Because cleaning removes what you can see, not the wet air and cold surfaces that grew it. Every shower puts a lot of water vapour into a small room. If it isn't removed effectively, it condenses on the ceiling, the silicone, the window and the coldest corners — and the mould returns in the same places. Damp Solve changes those conditions so it stops coming back.

I clean it, spray it and repaint it — why isn't that enough?

Cleaning and mould sprays deal with the growth that's already there, and repainting hides the staining. Neither changes how much moisture is in the room or how long it stays there. On a recurring problem the mould comes back through the paint within weeks or months.

Do I need to know which ventilation system I need?

No. That's our job. You tell us the room, what you're seeing and how it behaves — we recommend and install the solution that suits your bathroom, your property and the way you live in it.

Can you get me a solution without an on-site visit?

Yes. Use Find My Solution: answer the guided questions, give us the measurements and add photographs of the affected areas, the windows and the existing extractor. We recommend the appropriate solution and the price based on what you supply, and we attend to install it. Your recommendation and price rely on your answers, measurements and photographs being accurate and complete.

What if it isn't condensation?

Then we'll say so. Recurring mould can also come from a plumbing or roof leak, water getting in from outside, cold bridging or missing insulation. We won't fit a fan to cover up a leak or a building defect.

Is mould in the bathroom actually a problem?

It's a sign the room is holding too much moisture. Left alone it usually spreads — across the ceiling, into the silicone and grout, onto the window reveals, and eventually into paint and plaster that then needs making good.

Do you only deal with bathrooms?

Bathrooms are the most common call, but we also solve streaming windows, bedroom condensation and mould, mould behind furniture and wardrobes, musty cold rooms, and whole-home condensation problems.

Where does DAMP SOLVE work?

Across Central Scotland: Glasgow, Lanarkshire, East Kilbride, Motherwell, Hamilton, Renfrewshire, East Renfrewshire, Ayrshire, Falkirk and Stirling.

Landlord or letting agent?

New damp and mould duties for Scottish private and social landlords come into force on 6 October 2026. We have a separate page covering the timescales and how our work fits around them.

Landlords & letting agents

Prefer to just tell us?

Send us the problem instead

If you'd rather not go through the guided questions, send us a short message about the room and what you're seeing and we'll come back to you.

  • · Homeowners, tenants, landlords and letting agents all welcome
  • · We recommend the solution — you don't need to know what to ask for
  • · Solutions specified for your property, installed and commissioned
  • · No obligation — nothing is installed until you've agreed the price

Prefer to speak to someone?

1 — Who you are

Full postcode or first half is fine.

Landlords and letting agents only — helps us scope your response.

2 — The problem

Select all that apply.

Select all that apply.

What's fitted in the affected room at the moment?

Optional. How long it's been happening, previous work, access notes.

3 — Contact details

We use your details only to respond to this enquiry and arrange an investigation.