Loft Vents to Prevent Condensation – Options and Prices

Welcome to Quotation Check and our guide to loft ventilation products that prevent condensation.

Years ago, the only way to solve loft condensation was to instruct a roofing firm to install some form of vent. This type of work is costly and time-consuming.

Fortunately, there’s a new product on the block; it’s cheap and easy to install, even by a DIYer.

On this page, we’ll explain the four possible ways to vent a loft space of condensation.

Photos of Traditional 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


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 are several reasons why this could be happening:

  • Lack of roof/loft ventilation
  • Existing vents being blocked (perhaps by storage boxes or insulation)
  • Too much moisture being created in the home
  • No window vents or extractor fans in the home

Loft condensation usually only rears its ugly head during the winter, this is because the loft is cold enough to allow warm moist air to condensate, either on the underside of the roof tiles or the roofing felt.


Loft condensation

Condensation on the underside of the roofing felt in the loft

Roof Loft Vents

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

We are now recommending lap vents as the best option; they are cheap, can be purchased from Amazon and are super easy to install from within the loft space.

Option 1 – Lap Vents Installed DIY

These vents are so easy to install, they simply slot into place between the overlapping felt.

Lap vents currently have a 5-star rating on Amazon with many happy homeowners:

These vents are brilliant. We have had no condensation since we installed them. Yes they will fit and you don’t need one ever space. We installed one every 3 rafters and it’s solved. Best money we have spent for next to nothing. Amazon customer 2016

loft ventilation

Loft lap vents

Option 2 – Install Ridge Vents

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

Unfortunately, to install this vent, you’ll need to hire a roofing contractor, this isn’t a DIY friendly option.

Concrete tile vent to prevent condensation

Ridge Vent

Below is our cost guide to install three of these vents to a typical property, that should be enough to prevent loft condensation in a 3 bed home:

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

Option 3 – Tile Vents (Mid Roof)

These vented tiles are designed to replace regular tiles in the middle of the roof.

Although not 100% universal, they’re compatible with 90% of the tiles currently seen on UK roofs.

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.

These vents aren’t DIY friendly either as they need to be fitted from the exterior 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)
London Area£450.00£600.00
South, SW and Midlands£475.00£500.00
Outer Region and North£375.00£450.00
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here

Option 4 – Eaves Vents (circular vents)

Circular vents can be installed at the eaves level, near to the roofline boards and gutters.

These vents should be placed 800mm apart and work well in conjunction with ridge vents.

Circular vents can be installed DIY but the work does involve climbing a ladder.

eaves vents

Circular Soffit Vents

soffit vents hole being drilled

Vent Hole Being Drilled

Our guide price is based on 24 vents installed to a typical semi-detached house:

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

Our Recommendations

If your loft is experiencing issues with excess condensation in the winter, we suggest you start by installing the lap vents and then monitor the loft.

You can always add extra external vents if required.

A small amount of moisture is normal in some lofts, especially on calm no-wind days when there’s no draft to clear the moisture.

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One Response to “Loft Vents to Prevent Condensation – Options and Prices”

  1. Ian Horswell AGI ArchitectureMarch 26, 2018 at 9:52 am #

    Please can you provide me with a e-mail address, so that I can send over drawings for you to provide a quote for the vetilation design on a block of flats with a cold roof deck.

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