Commercial ventilation in Dartford
A free survey, a clear specification and a fixed price for commercial ventilation in Dartford.
- 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 Dartford?
Budget roughly £3,395–£27,995 per system ex VAT in Dartford. For a typical job — supply and extract for a 150 m² office — expect £7,995–£18,995 plus VAT. You get a fixed written quote after the free survey.
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.
Covering Dartford and nearby
In Dartford, typical premises are high-street shops, offices above them, surgeries, salons and local industrial units. Basildon is about 22 km away.
We cover every Dartford postcode, including DA1. Neighbouring towns we cover include Bexley, Swanley and Welling. For commercial ventilation in Dartford, the survey looks at how the space is used, where equipment and ductwork can go and what the electrical supply can take.
What the job covers
- Fresh-air rate calculation for each space
- Supply and extract fans, ductwork and grilles
- Filters, attenuators and fire dampers where required
- Air-flow measurement and balancing
- Commissioning records
Local guide prices for Dartford
Prices below include our regional adjustment for the South East (15% above the UK guide).
| Item | Guide price (ex VAT) | Inc VAT | Basis |
|---|---|---|---|
| Toilet or kitchenette extract | £570–£1,650 | £684–£1,980 | per room |
| Supply and extract system, small premises | £3,395–£11,450 | £4,074–£13,740 | per system |
| CO2 demand control | £455–£1,450 | £546–£1,740 | per zone |
| Ductwork | £75–£225 | £90–£270 | per metre |
Ex VAT. Larger systems and fire-rated ductwork are priced from a full design.
How we work in Dartford
Assess
We work out how many people use each space and the fresh-air rate needed. For sites in Dartford we confirm access and parking beforehand.
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.
Balance
Air flows are measured and balanced to the design.
Before you book in Dartford
Heat recovery
Bringing in cold air in winter costs energy. Heat recovery units reclaim much of it.
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.
Noise
Fans and grilles are selected and attenuated to keep noise down.
Leased premises
If your Dartford 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.
Types of premises we cover in Dartford
- Gyms and leisure: high-capacity cooling and fresh air for gym floors, studios and changing rooms.
- Restaurants and cafés: dining rooms that stay comfortable next to a hot kitchen and a busy service.
- Offices: zoned cooling and heating for open-plan floors, meeting rooms and comms rooms.
- Schools and education: classroom cooling, ventilation and IT room cooling, installed in the holidays.
Two rules matter for most businesses in England: GB F-gas rules (leak checks from 5 tonnes CO2e) and the periodic energy inspection for more than 12 kW of air conditioning.
Your questions answered
How much does commercial ventilation cost in Dartford?
Guide prices in Dartford run from about £3,395 to £27,995 per system, plus VAT. A typical job (supply and extract for a 150 m² office) costs £7,995–£18,995 plus VAT. We fix the price in writing after a free survey.
Do you also cover Bexley, Swanley and Welling?
Yes. Alongside Dartford, we also cover Bexley, Swanley and Welling. Each has its own page with local guide prices.
Which postcodes do you cover in Dartford?
All of them, including DA1. 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.
Need commercial ventilation in Dartford?
Free survey and fixed written quote. We reply with a guide price or to book the survey.