Cost to Install Loft Vents to Prevent Condensation

Welcome to our website and our guide to loft vents and prices. Some of our visitors are just curious about theses prices, others are budgeting for the future and some people print off our price guides and use them as a benchmark when negotiating with sales people. We think our research is invaluable but we will let you be the judge of that.

Photos of Venting Options:

roof eaves vents

Eaves vent strip

Vented ridge tiles

vent in roof to reduce condensation

Universal ridge tile

soffit vents

Soffit board vents

What’s Quotation Check and Where Did These Prices Come From?

Quotation Check is a website created by a small team of individuals in the United Kingdom. Our goal is to research the prices charged by tradespeople and companies and then display those figures here on our site (our full price list can be found here).

By comparing quotes you have already received to our average prices, we hope you can avoid traders that are overcharging.

Our figures are based on written quotes we received for loft and roof vents during December 2015  and January 2016 and we last updated the contents of this page on the

Don’t forget that there are limitations to our data; every loft is different and the number of vents required will be different for every house. Access issues and your location in the UK will also affect the price you receive. We do still feel however, that our research is invaluable and is a good starting point for homeowners researching ventilation costs.

Got Condensation in the Loft?

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
  • Excessive moisture being created in the house – families with newborn children often keep the windows closed and the heating on, this can make the condensation worse. Showering and bathing without adequate bathroom vents is also another contributing factor.

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.

In almost all cases,  you can reduce the amount of condensation by making lifestyle changes to reduce the amount of moisture in the property. Installing loft vents to release any moisture that has collected in the loft is also something you can try.

Loft condensation

Condensation on the underside of the roofing felt in the loft

Roof Loft Vents

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

Need a Fixed Loft Ventilation Price?

We hope you found our research into loft vents helpful, the next step is to arrange a custom quote for your roof.

We can help with that too. To get a fixed price, fill out the form and start comparing quotes:

  • Submit specifics of your ventilation project
  • Receive up to three quotes in return
  • Check ratings, reviews & feedback
  • No obligation on your part – also leave your own feedback when the job is complete
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