Discover the Cost to Repair or Replace a Roof Valley

If your roof is leaking directly underneath a valley section then you are not alone. Roof valleys are prone to leaking and are a well known weak spot on older roofs.

If you’re not sure what a roof valley looks like, check out the photos on this page.

How much it costs to repair or replace a roof valley will depend on what it’s made from.

Popular materials include:

  • Lead
  • Concrete tiles
  • Fibreglass

Roof Valley Repairs

There are occasions when a roof valley is in good condition, but the cement holding the tiles in place has washed out or crumbled. In these circumstances, it may be possible to just leave the existing valley base in place and replace only the cement.

Here are two “before” and After” photos of a valley with newly laid cement. The valley base was in excellent condition, so didn’t need replacing or repairing at all.

Old roof valley - before


Roof valley - after


Full Replacement

If the roof valley itself needs to be ripped out and replaced then this will involve significantly more work and cost.

A full valley replacement involves removing all the cemented tiles, underfelt and some timber to the section.

These materials are then replaced with a new fibreglass valley, new underfelt and the roof tiles bedded onto new cement.

How Long Does it Take to Repair or Replace a Roof Valley?

Once the access equipment has been erected, it should take two men less than half a day to rake out the old loose cement and replace it with new.

If a full replacement is required, the project should take two workers around half a day.

We assume the valley is no more than five metres long.

Cost to Repair or Replace a Roof Valley

Below are two cost examples for your consideration.

These figures were given to us by a selection of roofing firms in 2015 and 2018 (we averaged the prices and displayed them below).

Example cost 1 – Access tower erected to gutter height, rake out and replace the cement only, leaving the existing valley in place:

LocationSmall Business /TraderLarge Business
London Area£450.00£600.00
South, SW and Midlands£350.00£450.00
Outer Region and North£350.00£400.00
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here

Example cost 2 – Access tower erected to gutter height. Complete removal of existing valley, new underfelt, GRP fibreglass valley installed the tiles bedded down onto new cement:

LocationSmall Business /TraderLarge Business
London Area£550.00£750.00
South, SW and Midlands£500.00£650.00
Outer Region and North£450.00£550.00
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here

Why Do Roof Valleys Leak? What is the Most Common Cause?

Broken tiles in or near to the valley are the most cause of roof leaks, so do have the entire area thoroughly checked first.

Loose cement can cause tiles to slip out of place resulting in leaks.

Modern valleys are made from lightweight fibreglass trays but older valleys were made of heavy concrete slabs that are prone to leaking on the overlaps. Such valleys should be removed and replaced with a modern fibreglass system.

Here is a photo of a new fibreglass valley:

A fibreglass roof valley

Image sourced from Affordable Roofing

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5 Responses to “Discover the Cost to Repair or Replace a Roof Valley”

  1. neilMarch 15, 2016 at 11:06 am #

    maybe you should allow someone with some knowledge actually handle your sites information

  2. Pamela BullAugust 2, 2016 at 5:59 pm #

    I would like to no how much it cost to repair two val lies

  3. Freda ClarkeJuly 26, 2017 at 3:45 pm #

    How much does it cost for dry fix ridge tiles on a detached bungalow
    Slate roof

  4. SarahMarch 28, 2018 at 11:52 pm #

    Roof valleys can be just that – a dip in the quality of your roof, even if the rest of it is strong and has excellent U-values. I recommend maintain U-valleys as much as possible, and making sure that the right materials are used to account for weathering which might occur based on the shape and location of the valleys.

  5. C NamazieApril 17, 2018 at 5:14 pm #

    We assume as per Roofers comments the Roof Valley is damaged and the water is trickling into the Electrical Bulb/Fitting in the upstairs Loo. We are looking to replace the valley fitting by. a 12 gauge zinc 375mm wide) refit. The property is a semi detached 3 bedroom of Edwardian period. We have received quote on zinc or lead material. No quotes on fibreglass. Would you give an estimate on the 3 different material. Thank You

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