Fan and opening assessment
Dimensions, mounting, room type and expected airflow are checked for compatibility.
Alesta · Extractor fan replacement in London
Ventilation that clears the room properly.
Replacement bathroom and kitchen extractor fans matched to the opening, duct, electrical control and airflow requirement—not simply the old grille size.
☎ Call 020 3608 3976Air path before appliance choice
A new fan cannot overcome every ventilation problem.
Poor extraction can come from a failed motor, blocked grille, long duct, stuck external flap, unsuitable fan or a control problem. Replacing the visible unit without checking the air path can leave condensation and odour unchanged.
We identify the room, opening size, duct route, external termination and switching arrangement first. Bathroom zones, humidity controls, timers and kitchen grease exposure all affect the equipment and installation method.
Duct and outlet review
Accessible duct, backdraught shutter and external termination are considered.
Electrical control
Permanent live, switched live, timer or humidity functions are identified safely.
Airflow and function check
The fitted fan, controls, noise and basic draw are checked before handover.
Common reasons customers call
When steam, condensation or odour lingers.
The fan has stopped completely
There is no motor response despite the light or room circuit operating normally.
The fan runs but clears very little air
Duct restriction, a stuck flap or an unsuitable unit may be limiting performance.
Noise has increased
Worn bearings, loose mounting or an obstructed impeller creates rattling or grinding.
Timer or humidity control is unreliable
The fan starts late, never stops or fails to react when moisture rises.
Why Alesta for extractor fans
Replacement organised around airflow and controls.
Room requirement considered
Bathroom, WC and kitchen ventilation needs are not treated as interchangeable.
Duct limitations identified
Accessible restrictions and long routes are discussed before a fan is selected.
Electrical functions matched
Timer, humidity and switching arrangements are confirmed before connection.
Operation checked
Mounting, noise, controls and basic draw are reviewed after installation.
A compatible replacement
How we replace an extractor fan.
We begin with the room and the current installation. Photographs of the fan, controls, external grille and approximate duct route help identify the likely size and wiring arrangement. We ask whether the fan is linked to a light, has an overrun timer or humidity sensor, and whether it vents outside. Persistent mould or condensation may involve heating, insulation or moisture sources beyond the fan itself.
At the property, the electrician isolates the relevant circuit and removes the cover for inspection. The opening, duct diameter, accessible obstruction, external flap and cable arrangement are checked. A fan that spins but moves little air may not need the same remedy as a seized motor. Long or restrictive ducts can require an in-line or higher-pressure solution rather than a decorative low-powered axial replacement.
The agreed fan is fitted with suitable fixings and connected to the identified control arrangement. Bathroom electrical zones and equipment ratings are respected, while gaps or obvious air leakage around the opening are addressed within scope. Concealed duct replacement, core drilling, scaffolding and external high access are separate tasks and are confirmed before work extends beyond the fan position.
After energisation, the fan is run through its available switching, timer or humidity functions. Noise, vibration and basic draw at the grille are checked, and the external shutter is observed where accessible. The customer is shown any run-on behaviour and cleaning requirement. If the duct or building fabric still restricts performance, that limitation is explained instead of claiming a new motor alone has solved the wider ventilation issue.
Clear pricing
Extractor fan replacement prices.
Cost depends on fan type, controls, opening, duct condition, access and whether new wiring or core drilling is required.
| Service scope | Price | What affects the final price |
|---|---|---|
| Like-for-like fan replacement | From £150 | Accessible wiring, compatible size, standard controls and mounting |
| Timer or humidity fan upgrade | Typically £200–£300 | Control wiring, fan specification, duct and setup |
| New opening, duct or complex access | From £300 | Core drilling, route, external access, making good and electrical work |
Pricing context: Audited Alesta data places straightforward extractor replacement around £150 and more involved installations from about £300. The fan, controls and duct route must be checked for confirmation.
How the service works
From failed ventilation to a tested replacement.
Show us the fan and room
Send the grille, controls, external outlet and describe noise or airflow.
Confirm wiring, duct and fan
The installation is assessed and a compatible replacement is agreed.
Fit and function-check
The fan is installed, controls tested and any duct limitation explained.
Extractor fan replacement FAQ
Before the replacement visit.
Useful answers about fan type, timers, ducts, bathroom zones and pricing.
☎ Call 020 3608 3976Can I choose any fan with the same grille size?
No. Opening and duct diameter, airflow, pressure, room location, electrical rating and controls must all be compatible.
Why does my fan run but not clear steam?
The grille, duct or external flap may be restricted, or the fan may be unsuitable for the duct length. The air path should be checked with the unit.
Can you fit a timer or humidity fan?
Often, if the wiring and location support it. Some upgrades require an additional permanent or switched supply and cannot be achieved by changing the unit alone.
Is duct cleaning included?
Only a basic accessible check is included. Long concealed ducts or specialist cleaning and replacement require a separate scope.
Can the fan be installed in a bathroom?
Yes, with equipment and installation suitable for the applicable bathroom zone and electrical requirements.
Will the external grille be replaced?
Only when included and safely accessible. High external access, scaffolding or a damaged wall termination may require separate planning.
What affects the final price?
Fan specification, control wiring, opening, duct, external access, core drilling, making good and test time influence the quote.