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Commercial ventilation

Ventilation ductwork installation

Spiral and rectangular galvanised ductwork, hung, insulated and sealed.

  • From £45 + VAT per metre
  • Free survey on the UK mainland
  • Airflow tested and recorded
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Galvanised ductwork hung from the roof of an industrial unit

Ductwork carries air between the fan or unit and the rooms it serves, and how it is sized, hung and sealed decides how well the whole system performs. We supply and install spiral and rectangular galvanised ductwork, fittings, dampers, insulation and access panels.

How it works

Undersized or leaky ductwork forces fans to work harder and makes systems noisy. We work to recognised sheet-metal ductwork specifications, seal joints, fit access panels for cleaning and insulate ducts that run through cold spaces or carry cold air.

We install for our own ventilation systems and for other contractors, from short runs in a shop to full warehouse and office distribution.

Options we fit

Spiral ductwork

Round galvanised ductwork for supply and extract runs.

Rectangular ductwork

For larger volumes or limited ceiling depth.

Insulation and fire dampers

Thermal insulation and dampers where ducts pass through compartments, as designed.

Access panels

Fitted for future cleaning and inspection.

Signs you need this

  • A new system needs distribution ductwork
  • Existing ducts are leaking or damaged
  • A layout change needs ducts moved
  • Noise from undersized ducts
  • No access panels for cleaning
  • Uninsulated ducts dripping condensation

Guide prices

Ductwork installation guide prices
WorkGuide price
Spiral ductwork supplied and installed (up to 315 mm diameter) (per metre)£45–£95 + VAT
Rectangular ductwork supplied and installed, insulated where needed (per metre)£95–£225 + VAT

Guide prices using West Midlands (our baseline) rates. Home prices include VAT at 20%; business prices exclude VAT. A guide price is not a quote: we confirm a fixed price in writing first. London is about 20% higher and the North East about 8% lower.

What happens, step by step

  1. Survey

    Routes, hanging points and services clashes.

  2. Drawings

    Layout agreed or worked from the designer's drawings.

  3. Install

    Ducts hung, sealed and connected.

  4. Insulate

    Insulation and access panels fitted.

  5. Test

    Airflows measured once connected to the fans.

The rules that apply

England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). Workplaces must also be ventilated with a sufficient quantity of fresh or purified air under the Workplace (Health, Safety and Welfare) Regulations 1992.

Wales

Wales has its own Part F ventilation guidance, published by the Welsh Government, and work is checked by building control. The Workplace (Health, Safety and Welfare) Regulations 1992 also apply, requiring sufficient fresh or purified air.

Scotland

In Scotland, ventilation is covered by the Building (Scotland) Regulations and section 3 of the Technical Handbooks, and most building work needs a building warrant first. The Workplace (Health, Safety and Welfare) Regulations 1992 apply in Scotland too, requiring sufficient fresh or purified air.

Northern Ireland

In Northern Ireland, ventilation is covered by the Building Regulations (Northern Ireland) and Technical Booklet K. Northern Ireland has its own Workplace (Health, Safety and Welfare) Regulations (Northern Ireland) 1993 with the same duty to ventilate.

Questions people ask

How much does ductwork installation cost?

Spiral ductwork up to 315 mm typically costs £45 to £95 per metre and rectangular ductwork £95 to £225 per metre excluding VAT, supplied and installed, depending on size and height.

Spiral or rectangular duct?

Spiral duct is quicker to install and leaks less; rectangular duct fits shallow ceiling voids and larger airflows.

Do ducts need insulation?

Ducts carrying cold or warm air through unheated spaces usually need insulation to prevent heat loss and condensation.

Do you fit fire dampers?

We fit fire dampers where the design requires them; their selection and testing follow the fire strategy for the building.

Can you work to another contractor's design?

Yes. We install to consultants' and contractors' drawings.

Will you fit access panels?

Yes. Access panels make future cleaning and inspection possible.

Related services

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