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Signs Your Bathroom Ventilation Is Not Working
Most bathrooms have some kind of vent, often a small air vent in the wall or window. The question is whether the bathroom ventilation actually moves the moisture out. Look for these signs:
- Steam that hangs around: the mirror is still fogged ten or fifteen minutes after a shower.
- Black spots on the ceiling or silicone: mould grows where water sits on cold surfaces day after day. Our guide to removing mould from a shower covers the cleaning side.
- Peeling paint and swollen door frames: repeated damp works its way into plaster and timber.
- A fan you can hear but not feel: hold a sheet of toilet paper to the grille. If it does not pull in, the fan, the duct or the outlet is blocked or too weak.
- Damp spreading to the landing and bedrooms: moisture that is not extracted at source travels through the house.
If you recognise two or more of these, the bathroom needs better ventilation, not stronger cleaning products. A passive bathroom air vent on its own rarely clears shower steam; it needs a fan or a mechanical system behind it.
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The Bathroom Ventilation Options We Install
There is no single best bathroom ventilation system. These are the options we fit, from the simplest to whole house systems.
Wall or ceiling extractor fan
The standard answer for most bathrooms. A wall fan suits a bathroom on an outside wall; a ceiling fan is ducted through the attic to a roof or soffit outlet. A new standard fan installation costs €450 to €550 in 2026, and a replacement is €200 plus the fan. Details on our bathroom extractor fan installation page.
Inline fan
The fan sits in the attic or ceiling void, with only a grille in the bathroom. It is quieter, it can pull from a shower enclosure and an en suite at once, and it handles longer duct runs. Inline fan installation is €600 to €700.
Humidity and timer controls
A humidistat starts the fan when the air gets damp and keeps it running until the moisture is gone, so nobody has to remember to leave it on. A run on timer keeps the fan going for a set time after the light goes off. Both can be fitted with a new fan or an inline fan.
Mechanical extract ventilation (MEV)
One central unit extracts continuously from the bathroom, en suite, kitchen and utility through ducts, at a low quiet speed that boosts when needed. It replaces several separate fans with one bathroom ventilation system that also covers the kitchen and utility. See MEV ventilation in Dublin.
Single room heat recovery unit
For a bathroom on an outside wall where the room feels cold, a single room heat recovery unit extracts damp air and brings in fresh air while keeping most of the heat. See single room heat recovery units.
Whole house MVHR
In a new build, a deep retrofit or an airtight home, the bathroom ventilation is part of a heat recovery ventilation (MVHR) system that ventilates the whole house.
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What We Can Offer You?
Discover a wide range of specialised services tailored to enhance your home's comfort and safety. Our expert team is dedicated to delivering high-quality solutions that meet your specific needs.
Heat Recovery Ventilation System Installation
Experience enhanced indoor air quality with our expert heat recovery ventilation system installations. Our systems are designed to provide efficient energy use and a comfortable home environment.
Bathroom Extractor Fan Installation
Prevent moisture damage and control humidity effectively with our professional bathroom extractor fan installation service. Enjoy a fresher, cleaner bathroom atmosphere with optimal airflow.
Home Ventilation System
Ensure your home breathes as well as you do with our comprehensive home ventilation systems. We offer customised solutions that suit your specific needs for a healthier living space.
Anti-Mould Paint Services
VentSolve offers expert anti mould paint services that stop mould at the source and prevent future growth. Keep your home safe, healthy, and mould-free with our durable solutions.
Mould Removal
Get rid of harmful mould with our professional mould removal services. We use safe, effective techniques to ensure your environment is healthy and mould-free.
How to Choose the Right Bathroom Ventilation System
Four questions decide which option fits:
- Does the bathroom have an outside wall? If yes, a wall fan or a single room heat recovery unit is the shortest, simplest route. If not, the air has to go up through the ceiling and out via the roof or soffit.
- What is above it? An attic above the bathroom makes ceiling and inline fans straightforward. A bathroom under another floor needs a planned duct route.
- How many wet rooms are there? One bathroom usually needs one fan. A house with a bathroom, an en suite, a kitchen and a utility may be better served by one MEV unit than four fans.
- Is the problem only in the bathroom? If condensation and mould appear in bedrooms too, the whole house needs attention, and MVHR or MEV is worth comparing. Our article MVHR versus traditional extractor fans explains the difference.
Send us a photo and these answers and we tell you which bathroom ventilation option makes sense for your home before any visit.
Steps We Take to
Bathroom Ventilation and Mould
Mould in a bathroom is almost always a ventilation problem. A shower releases a lot of water vapour in a few minutes; if it is not extracted, it settles on the coldest surfaces (the ceiling, the window reveal, the corners of outside walls) and mould follows within weeks.
Cleaning or painting over mould without fixing the ventilation only buys time. The order that works is: fix or upgrade the bathroom ventilation first, then treat the mould, then protect the surface. Where the mould has spread, our mould removal service in Dublin starts from €350 depending on size and scope, and our guide to the best anti mould paint in Ireland covers the last step.
For the wider picture of damp in Irish homes, read our condensation season checklist.
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FAQs
Frequently Asked Questions
What is the best ventilation for a bathroom?
Does a bathroom with a window need a fan?
Can a bathroom fan be vented into the attic?
How do I ventilate a bathroom with no outside wall?
How much does bathroom ventilation cost in Dublin?
How long should a bathroom fan run after a shower?
Get the Right Bathroom Ventilation for Your Home
Tell us about your bathroom: a photo of the room and the ceiling, whether it has an outside wall, and your Eircode. We reply with the bathroom ventilation option that fits and a free preliminary quote by email. Fill out our contact form, or call (01) 685 6363 during office hours.
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