By the AHU Guide UK – Air Handling Units for British Homes Team · Updated June 2026 · Independent, reader-supported

Air Handling Unit Installation Cost UK: 2025 Price Guide & Quotes

Installing an air handling unit (AHU) in a UK property typically costs between £3,500 and £15,000 for most residential applications, though larger homes and commercial installations can reach £25,000+. The final cost depends on unit size, ductwork requirements, property layout, and labour rates in your area.

What You're Actually Paying For

An AHU installation isn't just the unit itself. You're paying for the equipment, the pipework or ductwork to distribute air, the controls, and the engineer time to install and commission it. Understanding each cost element helps you avoid surprises.

The unit itself ranges from £1,500 to £6,000 for residential models. A compact unit for a small flat sits at the lower end. A heat-recovery AHU (MVHR) for a four-bedroom house costs £2,500–£4,000. Larger units with integrated heating or cooling cost more. Commercial units start around £5,000 and scale upward.

Ductwork and installation is often the largest expense. Flexible or rigid ducting, fitting it through walls and ceilings, insulating it, and sealing joints costs £1,500–£5,000 depending on how much ducting you need and how accessible your property is. A single-storey property with straightforward routing might cost £2,000. A multi-storey Victorian terrace requiring careful routing around existing pipes and beams could reach £5,000.

Commissioning and controls (£300–£800) involves an engineer setting up the unit's sensors, dampers, and fan speed, then balancing airflow across all rooms. This is essential for the system to work efficiently.

Labour typically adds £1,500–£3,000 depending on complexity and your region. London and the South East run 20–30% higher than the Midlands or North.

Costs by Property Type

Flats and apartments usually cost £3,500–£7,000. Limited ductwork routing and smaller units keep costs down. The main complication is fitting ducting within existing ceiling voids or finding routing that doesn't breach fire compartmentation.

Semi-detached and detached houses (three to four bedrooms) range £6,000–£12,000. More rooms mean more ducting, longer installation time, and potentially more complex routing around existing structural features.

Bungalows can be cheaper (£5,500–£9,500) because everything sits on one level, reducing ductwork complexity. Older bungalows with solid construction may cost more if routing requires opening walls.

Period properties (Victorian, Edwardian, listed buildings) typically cost 20–40% more. Ductwork routing is constrained by plaster cornicing, solid walls, or conservation requirements. You may need flexible ducting routed through voids rather than embedded ducts, which takes longer.

New builds or properties with accessible loft spaces and cavity walls often cost less (£4,500–£9,000). Builders sometimes pre-route ductwork during construction, reducing on-site work.

Labour and Material Breakdown

Material costs (unit, ducting, grilles, filters, controls) typically run £2,000–£5,500. Labour usually accounts for 40–50% of the total. An engineer installing an AHU alone takes three to five days depending on complexity; a second tradesperson fitting ductwork adds another two to three days.

Supply-chain delays have eased compared to 2023, so material costs remain relatively stable. Labour rates rose 5–8% in 2024 and remain elevated, particularly in South East England where experienced AHU installers are in short supply.

What Affects Your Quote

Loft accessibility — if your AHU will sit in the loft, the engineer needs headroom to move, wire, and commission it. A cramped, boarded-over loft costs more to work in.

Existing pipework and electrics — if ductwork must navigate water pipes, electrical runs, or structural beams, routing takes longer and may require rerouting existing services.

Ductwork material choice — rigid galvanised steel ducts cost less upfront but take longer to fit; flexible ducts go faster but aren't suitable for all applications (they reduce efficiency over long runs).

Additional features — filters, humidifiers, or humidity sensors add £200–£600; integrated heating adds £2,000–£4,000; summer bypass (to avoid cooling the house on cool nights) costs £300–£500.

Commissioning scope — basic commissioning takes half a day (£300–£500); detailed commissioning with sensor calibration and airflow balancing at each room grille takes a full day (£600–£900).

Getting Reliable Quotes

Most AHU installers offer free surveys and quotes. Expect three to five days for an accurate written quote after the site visit. Quotes should itemise equipment, labour, ductwork, and commissioning separately.

Red flags: quotes that lump everything into one line, don't mention commissioning, or seem significantly lower than others. AHU installation is skilled work; unusually cheap quotes often signal corners being cut — poor ductwork sealing, rushed commissioning, or inexperienced installers.

Check the installer holds F-Gas certification (required for units with refrigerant) and is certified to install MVHR units if heat recovery is your goal.

Running Costs

Installation cost isn't the whole picture. AHUs cost £80–£200 per year to run for most residential properties, depending on fan speed and outside air quality. Heat-recovery units offset this by recovering warmth from extract air. With rising energy costs, an AHU that provides mechanical ventilation while keeping heating efficient is increasingly attractive for draughty or tightly sealed homes.

Summary

Budget £5,000–£10,000 for a typical three-bedroom house. Get three written quotes from qualified installers, expect a site survey first, and ensure commissioning is included. The cheapest quote rarely delivers the best outcome; an improperly commissioned AHU uses excess energy and fails to ventilate effectively.