New builds, extensions and testing, County Londonderry
Airflow testing and commissioning in County Londonderry
Calibrated flow-hood testing and commissioning sheets for fans, MEV and MVHR, across County Londonderry.
- From £135 inc VAT per home
- By arrangement
Airflow testing measures how much air each fan or valve actually moves, using a calibrated flow hood, and records it against the required rates. It is how you prove a ventilation system works, and for new homes it is part of the building regulations.
County Londonderry has every kind of building, from old terraces to new estates and business parks, and every job is designed around the building in front of us, not a standard kit.
Airflow testing in County Londonderry at a glance
- Area
- County Londonderry, Northern Ireland
- Towns listed
- 3, largest Derry
- Postcode districts
- BT48, BT52, BT55, BT49 and BT47
- Price region
- Northern Ireland
- Survey
- By arrangement, travel quoted first
What the work involves
Testing is also useful outside new builds: it shows landlords and homeowners whether existing fans meet the rates, and it is the first step in rebalancing an MVHR system that no longer feels right.
MEV and dMEV commissioning
Trickle and boost rates measured and set.
MVHR commissioning
Supply and extract at every valve measured and balanced.
Remedial advice
If a fan fails, we explain why and quote the fix.
Guide prices in County Londonderry
| Work | Guide price |
|---|---|
| Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home) | £135–£270 inc VAT |
| MVHR or MEV commissioning test, every terminal measured and recorded (per system) | £225–£365 inc VAT |
| Rebalance and recommission an existing MVHR system (per system) | £225–£410 inc VAT |
These ranges use our Northern Ireland rates. Prices include VAT at 20%. You get a fixed written price before any work is booked. Travel is quoted separately for this area.
When to get it looked at
- After MVHR or MEV installation by another company
- A landlord file needs proof of ventilation
- After rebalancing or extending a system
Rules in Northern Ireland
Northern Ireland has its own building regulations, with ventilation guidance in Technical Booklet K. Extract rates follow the Northern Ireland guidance and are measured at handover.
How the job runs
- Book
- Measure
- Adjust
- Record
- Advise
Towns we cover in County Londonderry
Questions about airflow testing and commissioning 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 airflow testing and commissioning sheet for extract fans (up to 6 fans) is typically £135 to £270 inc VAT per home.
How much does ventilation airflow testing cost?
Testing up to six extract fans costs £145 to £295 including VAT, and commissioning a full MVHR or MEV system £245 to £395.
What equipment is used?
A flow hood that fits over the fan or valve and measures airflow in litres a second, calibrated within the last 12 months.
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.