cost of roof patching

What Is The Cost of Roof Patching?

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What Is The Cost of Roof Patching?

How much does roof patching cost? It will cost $200-$800 for minor to moderate repairs and $1,000 - $3,000 for extensive damage, however the final figure will depend on lots of different variables. See our table below for some of the more common costs that homeowners have to meet.

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Table of costs of roof repair

Roof patching or roof repair is something every homeowner has to face at some point or another whether the roof is damaged by bad weather or there is a hidden leak which causes mold or rot to the roof deck or age is just catching up with the roofing material. If you want to find out the cause of and resolution to your roof damage, speak to a local roofer about the roof leak repair costs.

Type of patch or repair Average Cost
Roof leak repair, seal the leak and replace the shingles $500 - $1,200
Fixing missing roof shingles $100 - $300
To replace missing shingles £350 - $1,000
Flashing repair costs $200 - $500
Patch small leaks or mend flashing $150 - $400
Sagging roofs or leaks which require structural repair $1,000 - $3,000
Vent boot repair $150 - $400
Felt or decking repair $400 - $1,000
Truss or rafter repair $400 - $1,000
Small caulking and sealing $150 - $400


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 What are the factors which influence the cost of roof patching and repair?

There are so many different variables which can impact on the cost of roof patching and repair:-

  •         The pitch of the roof – if it is very steep and the roofers can’t walk on it then specialist equipment may be required
  •         The roofing materials – some materials are more difficult to work with and may require specific expertise or they could simply be more expensive to replace
  •         The extent of the problem, it may be an immediate issue or it could have lain undetected for months causing hidden and extensive damage
  •         Repairing older roofs can cost more

Types of repair and roof patching and the costs

Roof leak repair and roof patching cost – it will cost around $150 to $300 for minor sealing but if the leak needs fixing and then are shingles to replace and seal then the cost will increase to anywhere from $500 to $1,200. Don’t forget the internal repair and redecoration to ceilings which can cost between $400 and $1,500 depending on how many rooms are affected.

Water damage repair cost – roof structure repair costs caused by water damage can cost in the region of $500 to $3,000 depending on the severity and extent. It may be necessary to fix trusses and replace decking, underlayment and insulation plus the roof shingles. Roof replacement is usually recommended if more than 25% of the roof is damaged. Water damage doesn’t have to come from ingress of rainwater, heavy condensation from water heater pipes or AC duct work can also cause roof leaks.

Roof shingle repair and patching cost – shingle repairs cost on average $200 to $600 for replacing a few missing or broken asphalt shingles. The cost per roof square – a roof square equates to 100 square feet – is $350 to $1,000 for a full tear off and replacement.

Roof vent repair cost – a roof vent boot repair costs $75 to $150 on a roof with a standard slope, a complete roof vent replacement costs $150 to $750 depending on the size and type and whether or not it is exposed or covered by roof shingles.

The cost of repairing and patching roof flashing

Flashing is usually made of metal and is designed to direct water away from roof joints and fixtures; it is commonly seen around vulnerable points like chimney stacks and skylights. Vent pipe flashing prevents leaks at the joint where the pipe meets the roof surface. Drip edge flashing prevents water from going underneath the shingles at the edge of the roof and rotting the fascia, soffits or roof decking.

Here is a table with some typical flashing repair and patching costs, replacing the flashing will cost more.

Type of flashing repair Average cost
Skylight flashing $150 - $500
Chimney flashing $200 - $500
Vent pipe flashing $200 - $500
Drip edge flashing $1 - $2 per linear foot

Roof felt repair and patching cost

Underlayment or roof felt is a water-resistant barrier that protects the roof when tiles or shingles slip or are blown off. Roofing felt or underlayment will last between 15 to 30 years on average and leaks occur when it is worn out or starts to get holes. The National Roofing Contractors Association (NRCA) states that underlayment is necessary for all roofs although some roofing contractors do undertake repairs and renewal without roofing felt.

Roof felt repair costs are in the region of $300 to $1,400 for replacing up to 100 square feet of material and this price includes new flashing and removing and reinstalling the roofing shingles. Replacing the felt only is cheaper and costs $50 to $200 per 100 square feet for the materials and the labor of removing the old roofing to access the felt or underlayment and then replacing it.

The cost of patching a sagging roof

Minor sagging may only require a little additional support like rafter ties whereas severe cases will require the replacement of rotting rafters or possibly even a new roof. Costs range from $800 to $2,500 per roof square to replace roof decking and shingles so it can quickly become uneconomical.

Sagging roofs can be dangerous and will require a thorough inspection possibly from a structural engineer which can cost up to $1,000. Common causes for a sagging roof include:-

  •         Water damage – poor repair and persistent leaks cause the ingress of water and rots the lumbar
  •         Excess weight – this can be caused by roof overlayment so multiple roof layers but even just snow and ice or debris
  •         Pests – termites in particular in the roof deck or rafters will weaken the supports although this usually happens over a long period of time
  •         Old age – the timber frame will deteriorate over many years and this process can be hastened if the roof is not well maintained
  •         Improper ductwork – contractors working to install ductwork may take away too much of the roof frame which can lead to instability and lack of structural support
  •         Settling – this can sometimes occur with new houses which are bedding in and often only a few shingles are required to hide a minor roof sag

The cost of patching a roof based on roof material

Here are some useful figures which are relevant to your own roofing material.

Material Small repairs cost Cost to fix per roof square
Metal $200 - $600 $500 - $1,000
Asphalt shingles $100 - $300 $350 - $1,000
Composite shingles $200 - $300 $350 - $1,000
Clay or concrete tiles $200 - $400 $400 - $1,500
Wood Shake $200 - $500 $500 - $1,500
Slate $500 - $750 $1,000 - $3,000

 The importance of keeping your roof in good repair.

Annual roof inspections are really important to keep tabs on your roof and what’s going on – not all problems are obvious and visible from street level.

A roof inspection will cost in the region of $150-$350 depending on where you live and how large and complex the roof design is. Most roof contractors charge a minimum $150-$300 service fee, if you need a structural engineer because the roofing is sagging then be prepared to pay up to $1,000.  Inspections are particularly important if you have roof features like dormer windows or skylights which can be prone to leaking. The roofer should check the loft void and the exterior of the roof; many small issues if caught early are not that expensive but if left, will just develop into a larger and more costly problem.

Lots of homeowners will have a roof inspection when they have guttering and rainwater goods cleared out ready for the colder seasons. You should always have a roof check after bad weather as not all problems are readily apparent; roof shingles can slip or become loosened and you may not be able to see this from street level. Also, if you notice that shingles are curling or slipping for any reason then don’t delay, contact your roofing contractor quickly as the problem will only get worse.

How to find the right roofing contractor to patch your roof

It’s always worth knowing one or two local roofing contractors that you can call on for annual inspections, guttering clearance and if you need repairs or patching work done to your roof.

Using more than one person can be helpful if your regular roofer is busy or if there is a bad weather event in your area and there is a high demand for roofers.

If you don’t have a roofer that you regularly call on then ask around friends, neighbours and family to see if they can recommend someone who is reliable and turns up and doesn’t charge too much. A roofer who gets to know your roof because he inspects it annually is more likely to spot deterioration and problems before they occur

How to evaluate the roof on a house you are buying

Most people have a house surveyed before they buy it and a minimum survey is often a requirement of the mortgage company. A surveyor will look at the whole property but if you are concerned about the roof, sometimes it can be worth arranging a roof inspection to make a thorough assessment before you make an offer. You want to know what condition the roof is in and any repairs you are likely to need to make before you buy the house; it may assist you in negotiating a lower price with the vendor if you have all the facts and information available to demonstrate that you are going to have to spend X amount of dollars rectifying existing problems.

Frequently Asked Questions

Is it better to renew the roof rather than keep patching it?

This is a finely balanced judgement sometimes as it is hard to give up on a roof which still seems to have some life left in it. Your roofer can help you to decide but you might just feel that the bills are too frequent and/or too large to make it practical to continue and the money could be better spent going towards the cost of a completely new roof. The rule of thumb is that for roof repairs which cost more than $3,000 or are affecting more than 25% of the roof, then replacing the entire roof is recommended. Roof replacement will cost between $5,000 and $11,000 on average.

Can I claim the cost of roof patching on my home insurance?

Home insurance cover is there for things like storm damage or fire, if the roof is just in poor repair and the patching work is essentially just maintenance then you will not be able to make a claim for it.

Can I repair or patch the roof myself?

Roof repairs or patches are dangerous and skilled work, it involves working at height and most homeowners would not have the correct equipment to access the roof on a two-storey property. Even if the house is single storey or you are working on a garage, care needs to be taken as you can cause more damage to the roof by walking on it.

How much does roof patching cost on a garage?

An average figure for one roof square of either asphalt shingles, metal or roll roofing is between $250 and $850 with sealing work and flashing patching costing $10 to $25 per square foot. Whole roof replacement on a garage costs in the region of $1,000 to $2,500.

Are there any repairs or patching work on a roof you can safely leave?

Something very trivial could be left to the annual roof inspection, so perhaps a shingle that has slipped a little. The problem for the homeowner is that from street level, it is not always possible to evaluate the extent of the problem which could actually be more serious than first appears.

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