Airflow testing and commissioning in West Sussex

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.

We carry out airflow testing and commissioning across West Sussex, including Chichester, Burgess Hill, Crawley, Worthing and Bognor Regis. Prices use South East rates. Servicing, testing and repair visits are charged, and we tell you the cost before booking.

Airflow testing in West Sussex at a glance

Area: West Sussex
Towns listed: 16, largest Crawley
Postcode districts: BN12, BN16, RH6, RH10, BN6 and BN45
Price region: South East
Survey: Charged visit, price agreed first

What airflow testing and commissioning involves

Approved Document F expects mechanical ventilation in new dwellings to be tested with a flow device that has been calibrated within the last 12 months, and the results recorded on a commissioning sheet. The person commissioning should be registered with a competent person scheme for ventilation or show evidence of competence; we tell you who will sign your sheet when we quote. 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.

MVHR commissioning

Supply and extract at every valve measured and balanced.

Remedial advice

If a fan fails, we explain why and quote the fix.

Extract fan tests

Each fan measured and compared with the Part F rate for the room.

Guide prices in West Sussex

Airflow testing and commissioning guide prices in West Sussex
Work	Guide price
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£160–£325 inc VAT
MVHR or MEV commissioning test, every terminal measured and recorded (per system)	£270–£435 inc VAT
Rebalance and recommission an existing MVHR system (per system)	£270–£490 inc VAT

Guide prices using South East rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.

Common reasons people call

You are selling a new build and the paperwork is missing
Fans seem weak and you want evidence
After MVHR or MEV installation by another company

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.

How the job runs

Book
Measure
Adjust
Record
Advise

Towns we cover in West Sussex

Questions about airflow testing and commissioning in West Sussex

Which rules apply to ventilation in West Sussex?

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.

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.

Which towns in West Sussex do you cover?

All of West Sussex, including Chichester, Burgess Hill, Crawley, Worthing and Bognor Regis. If your town is not listed, send the postcode and we will confirm.

Are prices different in West Sussex?

Our guide prices are adjusted by region. In West Sussex we use South East rates, so airflow testing and commissioning sheet for extract fans (up to 6 fans) is typically £160 to £325 inc VAT per home.