Air handling units (AHU) in Greater London

An air handling unit (AHU) is the central plant that filters, moves and often heats, cools or recovers heat from the air for a building's ventilation system. We replace ageing units, upgrade fans and controls, and service AHUs so they keep delivering their design airflows.

If you are anywhere in Greater London, send the postcode and a few photos and we will tell you what we would recommend. Towns we cover include Westminster, Bexley, Barking, Archway and Sutton.

Air handling units in Greater London at a glance

Area: Greater London
Towns listed: 216, largest Brent
Postcode districts: CR4, SW12, E1, E1W, SW13 and SW14
Price region: London
Survey: Free survey (UK mainland)

What the work involves

Replacing the fan section with EC fans, or the whole unit with a modern heat recovery AHU, can cut running costs and noise while restoring airflow. New units must meet current ecodesign rules for fan efficiency and heat recovery. Replacements often involve crane lifts, roof work and out-of-hours changeovers.

Controls upgrade

New controls, sensors and BMS integration.

Planned servicing

Filters, belts, coils, drains and controls on a schedule.

Like-for-like replacement

New unit in the same position, connected to existing ductwork.

Guide prices in Greater London

Air handling units (AHU) guide prices in Greater London
Work	Guide price
Air handling unit replacement, small to medium unit, like-for-like position (per unit)	£11,950–£41,950 + VAT
Air handling unit service: filters, belts or EC fan check, coils, controls (per unit per visit)	£235–£475 + VAT

These ranges use our London rates. Prices exclude VAT. You get a fixed written price before any work is booked.

When to get it looked at

Rooms that no longer get enough air
Rising energy bills from old plant
Frequent belt or fan failures

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). Employers have a separate duty under the Workplace Regulations 1992 to provide effective and suitable ventilation.

How the job runs

Survey
Options
Plan
Install
Commission

Towns we cover in Greater London

Questions about air handling units (AHU) in Greater London

Are prices different in Greater London?

Our guide prices are adjusted by region. In Greater London we use London rates, so air handling unit replacement, small to medium unit, like-for-like position is typically £11,950 to £41,950 + VAT per unit.

Do you work on rooftop units?

Yes, with safe access arranged for roof work.

How much does an AHU replacement cost?

A small to medium AHU replacement in the same position typically costs £9,950 to £34,950 excluding VAT, depending on size, heat recovery and lifting.

Is the survey free in Greater London?

For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.

Which rules apply to ventilation in Greater London?

In England, ventilation in new and altered homes is covered by Approved Document F of the Building Regulations. Landlords also have duties under the Housing Health and Safety Rating System, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.