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What changes the cost of bathroom extractor fan installation?
In Cheshire, the cost of bathroom extractor fan installation depends on whether you are replacing a fan or fitting a new one, the type of fan, the route the duct takes to the outside, and the electrical work and controls. We print no price, so compare quotes for the same fan, route and wiring.
Last reviewed:Why bathrooms need extract ventilation
A shower or a bath puts a lot of moisture into a small room. Without a way out, it settles on cold walls, windows and ceilings as condensation, and over time that can lead to mould, peeling paint and damage to timber. An extractor fan removes damp air to the outside before it settles.
The Planning Portal says any new bathroom or shower room should have a means of extract ventilation, and that when refurbishing a bathroom, existing extract ventilation should be kept or replaced [S1].
QuoteZila is starting in Cheshire, with Crewe, Nantwich and Sandbach among the first towns. This guide prints no price. It explains what changes the cost of fitting a bathroom fan, and what to ask an electrician.
Replacing a fan or fitting a new one
The biggest difference between quotes is whether there is already a fan.
- Replacing a fan. If the old fan has failed or is noisy, a new one can often go in the same hole, using the same duct and wiring. This is usually the smaller job.
- Fitting a new fan. A new fan needs a route to the outside, a hole through a wall or ceiling, ducting, and a power supply. The wiring and switching have to be planned.
Even a replacement can grow if the old duct is crushed or too narrow for the new fan, or if the existing wiring does not suit the new controls.
Types of fan
- Axial wall or ceiling fan. The common type, suited to short duct runs straight through a wall or ceiling.
- Centrifugal fan. Better at pushing air along longer or bendier duct runs.
- Inline fan. Sits in the loft or a void, with a grille in the bathroom ceiling. It can be quieter in the room.
- Continuous running fan. Runs for general ventilation and can boost when the room needs more extraction.
Approved Document F gives a minimum intermittent extract rate of 15 litres per second for a bathroom [S2]. On a continuous extract system, Table 1.2 gives a bathroom high rate of 8 litres per second, for when additional extraction is required, and a continuous rate that is the whole dwelling ventilation rate: the sum of all extract ventilation in the dwelling on its continuous rate should be at least the rate in Table 1.3 [S2]. Ask the electrician which fan meets the guidance for your bathroom and duct run.
The duct route
How the damp air gets outside decides much of the labour.
- Straight through an outside wall. Often the shortest route. A solid brick or stone wall takes longer to core drill than a cavity wall.
- Up through the ceiling and out through the roof or soffit. Used when the bathroom has no outside wall, or the fan sits in the ceiling. It means working in the loft.
- Through a window. Some fans fit into a pane of glass, which usually means a new pane.
The duct should be as short and straight as possible, and run so condensation drains away rather than back into the fan. Ask how the duct will be routed and where it will come out.
Electrics, zones and controls
An extractor fan is electrical work in a bathroom, and this guide gives no DIY steps. Electrical Safety First advises using a registered electrician to advise on, install or replace an extractor fan, and says the zones around a bath or shower limit which fans can go where [S3].
The Planning Portal says changes to circuits in special locations, which in England means around baths and showers, are notifiable, and that an electrician registered with a competent person scheme can self-certify the work [S4]. Ask for the certificate when the job is done.
The controls change the wiring:
- Switched with the light, with a timer to keep it running after the light goes off.
- Humidistat, switching on when the air is humid.
- Pull cord or separate switch.
- Isolating switch so the fan can be safely turned off for cleaning or repair.
Electrical Safety First: find a registered electrician; NICEIC; NAPIT. QuoteZila is not affiliated with this organisation.
What changes the cost of a bathroom extractor fan
| What is being priced | What makes it bigger or smaller | What to ask |
|---|---|---|
| Type of job | Replacement in the same hole, or a new fan | Which one they are quoting |
| The fan | Axial, centrifugal, inline, continuous, quiet models | Which fan, and whether it meets the extract rate |
| Hole | Through a wall, ceiling or window; wall type | How the hole will be made |
| Duct route | Short through the wall, or through the loft | The route and where it comes out |
| Outside grille | Wall grille, soffit or roof outlet | What is fitted outside |
| Wiring | From the lighting circuit, new switch, isolator | How it will be wired |
| Controls | Timer, humidistat, pull cord | Which controls are included |
| Making good | Filling, painting, tiling round the fan | Where the price stops |
| Certificate | Self-certified notifiable work | Which scheme they belong to |
| VAT | Whether the business is VAT registered | Whether the total includes VAT |
A business must register for VAT when its taxable turnover goes over £90,000 [S5]. Ask whether each total includes VAT.
Extractor fans in Cheshire
When you post the job, say whether there is an existing fan, whether the bathroom has an outside wall, and what is above it: a loft, another room or a flat roof. A registered electrician covering Crewe, Nantwich, Sandbach and the villages around them can then tell you which route is likely and whether the job is a quick swap.
Photos of the bathroom ceiling, the outside wall and the existing fan, if there is one, save a visit for simple jobs. Anyone in the UK can still post a job or register a business on QuoteZila.
Living with the fan once it is fitted
A fan only helps if it is used. If the fan is noisy, people tend to switch it off, so ask about noise levels when choosing one, and whether an inline fan in the loft would be quieter in your room. A timer or humidistat takes the decision out of people's hands, which suits busy households.
Grilles and fans collect dust and fluff, and a clogged fan moves much less air. Ask the electrician how to clean the grille safely and where the isolating switch is. If the fan has a backdraught shutter, check it opens freely. If mould keeps coming back after a fan is fitted, the cause may be wider than the bathroom, such as cold walls or poor heating, and a damp specialist may help.
What to have ready before you ask for quotes
- whether there is an existing fan, and a photo of it
- whether the bathroom has an outside wall, and what the wall is made of if you know
- what is above the bathroom: loft, room or flat roof
- photos of the ceiling, the walls and the outside of the house at that point
- the controls you would like: timer, humidistat or pull cord
- whether you have condensation or mould now
- your postcode, and when the work could be done
How to compare extractor fan quotes
Check each quote for:
- The fan named, and its extract rate.
- The duct route and outside grille.
- How the hole will be made, and making good.
- Wiring, controls and an isolating switch.
- The certificate for the electrical work, and the scheme they belong to.
- Whether VAT is included, and whether it is a fixed price.
Citizens Advice suggests getting written quotes from at least three traders and asking to see their insurance policies [S6].
Jobs you might post
These are examples, not taken from real job posts. "Bathroom extractor fan has stopped working. Please replace it with a quieter fan with a timer." Or: "No fan in our shower room. It has an outside wall. Please quote to fit one with a humidistat." Or: "Bathroom in the middle of the house with a loft above. Need an inline fan ducted out through the soffit."
Get quotes for an extractor fan
Describe the bathroom, any existing fan and your postcode, and add photos. Up to five matched local businesses can reply [QZ2]. QuoteZila is free for customers and local businesses [QZ1].
Honest status: QuoteZila is new. We're starting in Cheshire, beginning with Crewe, Nantwich and Sandbach, and growing area by area. Anyone in the UK can still post a job or register a business. How fast you get quotes depends on how many local businesses have joined near you. Businesses can register and receive jobs straight away. We don't check insurance, qualifications or registrations, so please check these yourself before you hire.
Posting a job is not open yet
See the electricians page, the damp proofing page or the electrician cost guide. For a full bathroom refit, see the bathroom cost guide.
Official and public sources
QuoteZila is not affiliated with these organisations.
- Extract ventilation in bathrooms: Planning Portal: need for additional ventilation [S1].
- Extract rates: Approved Document F, volume 1 (2026 edition) [S2].
- Extractor fan safety: Electrical Safety First [S3].
- Electrical work and building regulations: Planning Portal: electrics [S4].
- Quotes and insurance: Citizens Advice [S6].
- VAT: GOV.UK on when to register [S5].
GOV.UK: building regulations approval. QuoteZila is not affiliated with this organisation.
Questions about extractor fan costs
How much does bathroom extractor fan installation cost?
This guide does not print a price. Swapping a fan in an existing hole is a smaller job than cutting a new hole through a solid wall or running ducting through a loft. The fan, the controls and the wiring also change the total, so compare quotes for the same work.
Who should install a bathroom extractor fan?
A registered electrician, because it is electrical work in a bathroom, and this guide gives no DIY steps. Electrical Safety First advises using a registered electrician to advise on, install or replace an extractor fan. A bathroom fitter may bring one in.
Do I need building regulations approval for an extractor fan?
The Planning Portal says changes to circuits in special locations, which in England means around baths and showers, are notifiable, and that a registered electrician can self-certify the work. Ask the electrician for the certificate when the job is finished.
How powerful should a bathroom extractor fan be?
Approved Document F gives a minimum intermittent extract rate of 15 litres per second for a bathroom. On a continuous extract system, the bathroom high rate is 8 litres per second, and the continuous rate is the whole dwelling ventilation rate: the sum of all extract ventilation in the dwelling on its continuous rate should be at least that rate. Ask the electrician which fan meets the guidance for your room.
Does every bathroom need an extractor fan?
The Planning Portal says any new bathroom or shower room should have a means of extract ventilation, and that when refurbishing, existing extract ventilation should be kept or replaced. If your bathroom suffers condensation and mould, a fan may help.
What are humidistat and timer fans?
A timer fan keeps running for a set time after the light or switch goes off. A humidistat fan switches on when the air is humid and off when it clears. Ask which controls suit how the room is used, and how they will be wired.
Does QuoteZila check the electricians who quote?
No. We don't check insurance, qualifications or registrations, so please check these yourself before you hire. You can report a quote or a business from your job page.
Related guides
- Electricians: fans, lighting and wiring
- Bathroom fitters: fans as part of a refit
- Damp proofing: condensation and damp
- Electrician cost: how electricians price work
- All cost guides
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- Changing a Light Fitting: What Changes the Quote. What moves the quote to change a light fitting: the ceiling, old wiring, heavy fittings, downlights, bathrooms and outside lights. No price per light printed.
- Consumer unit replacement: what to ask. Replacing a consumer unit in Cheshire may need building regulations approval. No unit price is printed. See what the quote should include.
Sources
- QZ1: QuoteZila product fact. QuoteZila home and jobs-for-tradesmen copy.
- QZ2: QuoteZila product fact. QuoteZila terms and matching notes.
- S1: Building Regulations: need for additional ventilation, Planning Portal. Accessed 2026-10-26. https://www.planningportal.co.uk/permission/common-projects/kitchens-and-bathrooms/building-regulations-need-for-additional-ventilation/
- S2: Approved Document F, volume 1: dwellings (2026 edition), GOV.UK (Ministry of Housing, Communities and Local Government). Accessed 2026-10-27. https://assets.publishing.service.gov.uk/media/69c12224d588c92c483e4b6a/ADF1_2026.pdf
- S3: Electrical safety advice for extractor fans, Electrical Safety First. Accessed 2026-10-26. https://www.electricalsafetyfirst.org.uk/guidance/safety-around-the-home/extractor-fan-safety/
- S4: Building Regulations: general information, electrics, Planning Portal. Accessed 2026-10-26. https://www.planningportal.co.uk/permission/common-projects/electrics/building-regulations-general-information/
- S5: Register for VAT, GOV.UK. Accessed 2026-10-26. https://www.gov.uk/register-for-vat
- S6: Before you get work done on your home, Citizens Advice. Accessed 2026-10-26. https://www.citizensadvice.org.uk/consumer/getting-home-improvements-done/before-you-get-building-work-done/