Bathroom & Kitchen Extractor Fan Installation
Professional extractor fan installation by qualified electricians. Bathroom and kitchen ventilation with ducting, timer, and humidistat options. Qualified and insured.
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Bathroom & Kitchen Extractor Fan Installation
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How it works
Survey and fan selection
The electrician assesses the room size, existing ventilation, and ducting route options. They calculate the required extraction rate (typically 15 l/s for bathrooms, 30 l/s for kitchens adjacent to hobs) and recommend a suitable fan type — axial for short duct runs through external walls, or centrifugal/inline for longer duct runs through ceiling voids.
Ducting and core drilling
If no existing duct or vent hole exists, the electrician core-drills through the external wall and fits a duct with an external grille or louvre. For ceiling-mounted fans, rigid or semi-rigid ducting is run through the ceiling void to a soffit or tile vent. All joints are sealed to prevent condensation leaks.
Electrical connection
The fan is connected to the electrical supply — typically a fused spur from the lighting circuit for bathroom fans, or a dedicated spur for higher-rated kitchen fans. Timer and humidistat models require a permanent live feed and a switched live from the light switch. All connections in bathrooms must comply with BS 7671 zone requirements.
Fan mounting and commissioning
The fan unit is secured into the wall aperture, ceiling, or inline position. Ductwork connections are sealed. The fan is powered on and tested for correct operation, airflow direction, and noise level. Timer overrun and humidistat sensitivity are adjusted to suit the room.
Testing and certification
The circuit is tested to BS 7671 standards — insulation resistance, earth continuity, and RCD operation. A Minor Electrical Installation Works Certificate is issued. The electrician demonstrates the fan operation and explains filter cleaning and maintenance requirements.
What's included
What's involved
An extractor fan removes moisture, odours, and airborne contaminants from bathrooms, kitchens, and utility rooms. The installation involves fitting the fan unit into an external wall or ceiling void, running ductwork to the outside, connecting the fan to a suitable electrical supply, and configuring the control method — pull-cord, light switch, timer overrun, or humidistat. Correct installation is essential for meeting Building Regulations Part F (ventilation) and preventing condensation, mould, and structural damp.
Extractor fan installation in bathrooms is notifiable electrical work under Part P of the Building Regulations because bathrooms are classified as special locations. The fan must be connected to the correct zone-appropriate supply, and the circuit must have RCD protection. In kitchens, a new circuit or spur may be needed depending on the fan rating. Building Regulations Part F requires mechanical ventilation in any room without an openable window — failure to install adequate ventilation can result in Building Control enforcement action and chronic damp problems.
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Typical cost: £150–£350per installation
Every job is different — pricing depends on your property, location, and specific requirements. Describe what you need and a qualified electrician will quote you directly.
How long does it take?
2-4 hours for a standard bathroom fan with existing vent hole. Add 1-2 hours if core drilling is required. Kitchen installations with longer duct runs may take a full day.
Regulations & safety
Safety notice
Bathroom extractor fans must be suitable for the IP (Ingress Protection) rating required by the zone in which they are installed. A fan above a shower must be rated at least IPX4. Using an unrated fan in a wet zone creates a serious electric shock risk.
Never block or seal over an extractor fan duct opening — this causes moisture to build up in the ceiling void, leading to mould growth, timber rot, and potential collapse of plasterboard ceilings.
Extractor fans with timer overrun require a permanent live supply. If the permanent live is disconnected (e.g., at the light switch), the fan cannot complete its overrun cycle and moisture is not adequately removed.
Building Regulations — Approved Document F (Ventilation)
Part F sets minimum ventilation rates for habitable rooms. Bathrooms require mechanical extract ventilation of 15 litres per second (intermittent) or 8 l/s (continuous). Kitchens require 30 l/s adjacent to a hob or 13 l/s continuous. A room without an openable window must have mechanical ventilation.
Part P of the Building Regulations (Approved Document P)
Electrical work in bathrooms (special locations) is notifiable under Part P. This includes installing or modifying circuits for extractor fans. Work must be carried out by a competent person scheme registered electrician or inspected by Building Control.
BS 7671:2018+A2:2022 (IET Wiring Regulations)
Section 701 covers requirements for electrical installations in bathrooms. Fan equipment must be suitable for the zone in which it is installed. All circuits supplying bathroom fans must be protected by a 30mA RCD.
What to expect
Frequently asked questions
We’re happy to answer all your questions.
Do I need an extractor fan if my bathroom has a window?
Building Regulations Part F does not require mechanical ventilation in a bathroom with an openable window that provides adequate background ventilation. However, most electricians and building inspectors strongly recommend fitting one regardless — windows are rarely opened in winter, and inadequate ventilation is the leading cause of bathroom mould in the UK.
What is the difference between a timer fan and a humidistat fan?
A timer fan runs for a set period (usually 15-30 minutes adjustable) after the light is switched off. A humidistat fan has a built-in humidity sensor and activates automatically when moisture levels rise above a set threshold, running until humidity drops back to normal. Humidistat fans are more effective because they respond to actual moisture rather than a fixed timer.
Can I replace a basic fan with a timer or humidistat model?
Usually yes. Timer and humidistat fans require a permanent live feed in addition to the switched live from the light switch. If your existing fan only has a switched live (it turns off with the light), the electrician will need to run an additional wire from the permanent supply. This is straightforward in most installations.
Why is my extractor fan so noisy?
Excessive noise is usually caused by a blocked or kinked duct, a fan running beyond its rated duct length, or worn bearings in an old fan. Axial fans are inherently noisier than centrifugal fans. If the noise started recently, check the duct for blockages. If the fan is over 5-7 years old, the bearings may need replacing — often it is more cost-effective to fit a new fan.
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