Commercial ventilation, County Londonderry
Air handling units (AHU) in County Londonderry
AHU replacement, EC fan upgrades, controls and planned servicing, across County Londonderry.
- From £9,150 + VAT per unit
- By arrangement
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.
Every job in County Londonderry gets a written quote before it starts and a commissioning record when it finishes. We cover Coleraine, Limavady and Derry and the villages around them.
Air handling units in County Londonderry at a glance
- Area
- County Londonderry, Northern Ireland
- Towns listed
- 3, largest Derry
- Postcode districts
- BT47, BT48, BT52, BT55 and BT49
- Price region
- Northern Ireland
- Survey
- By arrangement, travel quoted first
What the work involves
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. We plan the lift, temporary arrangements and isolations with you so the building can keep working.
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.
EC fan retrofit
Belt-driven fans replaced with direct-drive EC fans.
Guide prices in County Londonderry
| Work | Guide price |
|---|---|
| Air handling unit replacement, small to medium unit, like-for-like position (per unit) | £9,150–£32,150 + VAT |
| Air handling unit service: filters, belts or EC fan check, coils, controls (per unit per visit) | £180–£365 + VAT |
These ranges use our Northern Ireland rates. Prices exclude VAT. You get a fixed written price before any work is booked. Travel is quoted separately for this area.
Common reasons people call
- Filters that are never changed
- Corroded casings or leaking drain trays
- Rooms that no longer get enough air
Rules in Northern Ireland
Northern Ireland has its own building regulations, with ventilation guidance in Technical Booklet K. Employers in Northern Ireland have an equivalent ventilation duty under the 1993 Northern Ireland workplace regulations.
How the job runs
- Survey
- Options
- Plan
- Install
- Commission
Towns we cover in County Londonderry
Questions about air handling units (AHU) in County Londonderry
Are prices different in County Londonderry?
Our guide prices are adjusted by region. In County Londonderry we use Northern Ireland rates, so air handling unit replacement, small to medium unit, like-for-like position is typically £9,150 to £32,150 + VAT per unit.
How often should an AHU be serviced?
Most AHUs need servicing at least twice a year, with filters changed more often in dirty environments. SFG20 schedules are commonly used to set frequencies.
Is it worth replacing belt-driven fans with EC fans?
Often yes. EC fans are usually more efficient, quieter and need no belt changes, and the retrofit can cost much less than a new unit.
Is the survey free in County Londonderry?
Visits here are by arrangement. Because of the ferry or long travel involved, we quote travel separately and in writing before you commit, and we can often combine visits to keep the cost down.
Which rules apply to ventilation in County Londonderry?
In Northern Ireland, ventilation is covered by Technical Booklet K of the Building Regulations (Northern Ireland). Workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations (Northern Ireland) 1993.
Other services in County Londonderry
Get a guide price in two minutes
Answer a few questions for a price range, or send photos and we will come back to you with a written quote.