Commercial ventilation in St Helens
Commercial ventilation for businesses in St Helens — surveyed, designed and priced in writing before any work starts.
- Free site survey and fixed written quote
- Equipment, positions and price set out in writing
- Work planned around your opening hours
How much does commercial ventilation cost in St Helens?
In St Helens, guide prices run from about £2,895 to £23,995 per system, plus VAT. A typical job (supply and extract for a 150 m² office) usually comes to £6,795–£16,150 plus VAT. Your exact price is fixed in writing once we have surveyed.
Commercial ventilation brings outdoor air into a building and removes stale air, using fans and ductwork to supply and extract air at the rates needed for the number of people and the activity.
Our coverage in St Helens
In St Helens, commercial premises range from city-centre office blocks and shopping streets to restaurants, hotels and industrial estates.
Postcode districts we cover in St Helens include PO33 and WA10. We also cover Prescot, Ashton in Makerfield and Huyton, all within easy reach of St Helens. We plan work in St Helens so the noisy parts happen when they disturb your business least.
What you get
- Fresh-air rate calculation for each space
- Filters, attenuators and fire dampers where required
- Controls such as timers or CO2 sensors
- Air-flow measurement and balancing
- Commissioning records
Commercial ventilation prices in St Helens
These guide prices are adjusted for the North West, where labour and access costs run about 2% below the UK guide.
| Item | Guide price (ex VAT) | Inc VAT | Basis |
|---|---|---|---|
| Toilet or kitchenette extract | £485–£1,395 | £582–£1,674 | per room |
| Supply and extract system, small premises | £2,895–£9,750 | £3,474–£11,700 | per system |
| CO2 demand control | £385–£1,195 | £462–£1,434 | per zone |
| Ductwork | £65–£190 | £78–£228 | per metre |
Ex VAT. Larger systems and fire-rated ductwork are priced from a full design.
How we work in St Helens
Assess
We work out how many people use each space and the fresh-air rate needed.
Design
Fan, duct and grille sizes are designed for air flow, noise and energy use.
Install
Ductwork and fans are installed and connected to controls. We keep work areas in St Helens screened and tidy at the end of each day.
Balance
Air flows are measured and balanced to the design.
Local points to consider
Building Regulations
New or altered ventilation in England must meet Approved Document F. We design to it and hand over the commissioning records.
Leased premises
If your St Helens premises are leased, the landlord's written consent is usually needed for external units, wall penetrations and roof access. We provide drawings and data sheets for the request.
Fire
Ducts passing through fire-rated walls or floors need fire dampers.
Neighbours and noise
Outdoor units near flats — common above shops — need careful siting so noise at neighbours' windows stays low. We choose positions and quieter units with that in mind.
Who we work with in St Helens
- Schools and education: classroom cooling, ventilation and IT room cooling, installed in the holidays.
- Offices: zoned cooling and heating for open-plan floors, meeting rooms and comms rooms.
- Healthcare and dental: clean, quiet cooling for surgeries, clinics, dental practices and care settings.
- Restaurants and cafés: dining rooms that stay comfortable next to a hot kitchen and a busy service.
In England, systems holding 5 tonnes CO2 equivalent of refrigerant or more fall under GB F-gas rules, with regular leak checks and records; buildings with more than 12 kW of air conditioning in total also need a periodic energy inspection.
Your questions answered
How much does commercial ventilation cost in St Helens?
Guide prices in St Helens run from about £2,895 to £23,995 per system, plus VAT. A typical job (supply and extract for a 150 m² office) costs £6,795–£16,150 plus VAT. We fix the price in writing after a free survey.
Do you also cover Prescot, Ashton in Makerfield and Huyton?
Yes. Alongside St Helens, we also cover Prescot, Ashton in Makerfield and Huyton. Each has its own page with local guide prices.
Which postcodes do you cover in St Helens?
All of them, including PO33 and WA10. Give us your postcode when you enquire and we will confirm the visit details.
Does air conditioning provide fresh air?
No. Most air conditioning recirculates room air. Fresh air needs a ventilation system or openable windows.
How much fresh air does an office need?
Guidance for offices is typically around 10 litres per second per person, with more for rooms with higher pollutant loads. We calculate it per space.
Talk to us about your premises in St Helens
Free survey and fixed written quote. We reply with a guide price or to book the survey.