Cost to Install Loft Vents to Prevent Condensation

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Loft condensation is the result of excess moisture collecting in the void (loft) between the ceiling and the roof tiles.

There’re many reasons why this could be happening:

  • Lack of roof/loft ventilation
  • Existing vents being blocked (perhaps by storage boxes or insulation)
  • Lack of insulation causing moisture to rise through the ceiling into loft

Loft condensation usually only appears during winter, when the loft is cold enough to allow warm moist air to condensate, either on the underside of the roof tiles or the roofing felt.

If your loft suffers from condensation in the summer (this is rare) then you will need to ascertain the source of the moisture, it could be a water thermostat that is faulty, causing a hot water tank to be constantly boiling water, thus releasing steam.

Loft condensation

Condensation on the underside of the roofing felt in the loft

Roof Loft Vents

If your property doesn’t have enough loft vents (or none at all) then installing them should alleviate the problem of condensation, but you should first look into ways of reducing the amount of moisture getting into the loft in the first place.

There are three types of roof vents that you can consider; eaves vents, tile vents and ridge vents.

We would suggest you install one ridge vent for at least every three metres of ridge and also either eaves vents or tile vents. There is no need to install all three types of vents on one roof.

Cost 1 – Ridge Vents

These vents are secured at the highest point of the roof, and they allow warm rising air to escape:

Concrete tile vent to prevent condensation

Ridge Vent

Below is our cost guide to install three of these vents to a typical property:

LocationSmall Business /TraderLarger Business (5+ employees)
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here
London Area£350.00£500.00
South, SW and Midlands£275.00£350.00
Outer Region and North£250.00£350.00

Cost 2 – Tile Vents (Mid Roof)

These vented tiles are to replace tiles mid-roof, they are compatible with 90% of the tiles currently in use within the UK. For a typical semi-detached or terraced house, you would need two tiles to the front and another two tiles to the rear of the roof:

Vented roof tile to stop loft condensation

Our cost/price guide below is therefore based on installing four roof vent tiles:

LocationSmall Business /TraderLarger Business (5+ employees)
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here
London Area£450.00£600.00
South, SW and Midlands£475.00£500.00
Outer Region and North£375.00£450.00

Cost 3 – Eaves Vents (circular vents)

Circular vents are installed at eaves level, to allow an airflow into the loft space, they are usually installed in conjunction with ridge vents. The soffit board is drilled and these vents slotted into place, we suggest one vent every 800mm or according to the manufacturer’s instructions.

eaves vents

Circular Soffit Vents

soffit vents hole being drilled

Vent Hole Being Drilled

Our quote is to install twelve vents to both front and rear of a typical semi-detached or terraced house:

LocationSmall Business /TraderLarger Business (5+ employees)
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here
London Area£275.00£400.00
South, SW and Midlands£300.00£350.00
Outer Region and North£300.00£325.00

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