What Do Surveyors Look for on a Roof? A UK Homeowner's Guide

Receiving a survey report that mentions the roof can be worrying, especially if you are buying a home. However, comments about a roof do not automatically mean that it needs to be completely replaced.

Surveyors are trained to identify visible signs of deterioration and highlight areas that may require further investigation. They are not normally carrying out a destructive roofing inspection, and they cannot always confirm the exact cause or full extent of a defect.

This guide explains what surveyors look for on a roof, what common comments in a survey report mean and when you should speak to a professional roofing contractor.

What Is a Surveyor Assessing?

When inspecting a property, a surveyor will assess the overall condition of the roof covering, drainage system, chimney, flashings and any visible structural components.

They are generally looking for evidence that the roof is:

• Weatherproof
• Structurally sound
• Properly maintained
• Free from serious leaks or deterioration
• Unlikely to require significant expenditure in the immediate future

The amount of detail included in the report will depend on the type of property survey being completed and how much of the roof is safely visible or accessible.

What Parts of the Roof Will a Surveyor Check?

A surveyor may inspect the roof externally from ground level, from an accessible window or from another safe vantage point.

Where the loft can be accessed safely, they may also inspect the underside of the roof from inside the property.

The visible checks will commonly include:

• Roof tiles or slates
• Ridge and hip tiles
• Roof valleys
• Lead flashings
• Chimneys
• Gutters and downpipes
• Fascias and soffits
• Roofline alignment
• Moss and vegetation growth
• Signs of previous repairs
• Accessible loft spaces
• Visible roof timbers
• Evidence of water ingress
• Signs of condensation or poor ventilation

The surveyor will also look at the roof as a complete system rather than focusing on only one tile or isolated defect.

What Surveyors Cannot Normally Inspect

A standard property survey is not the same as a specialist roof inspection.

Surveyors will not normally:

• Lift or remove roof tiles
• Remove loft insulation
• Dismantle parts of the roof
• Open up ceilings or walls
• Carry out destructive testing
• Inspect areas that cannot be accessed safely

Where access is restricted, the surveyor may inspect the roof from ground level or use binoculars.

These limitations are why survey reports frequently recommend obtaining a specialist roofing inspection when a potential issue is identified.

The recommendation does not necessarily mean that the roof has failed. It means that a more detailed assessment is needed before a reliable repair or replacement decision can be made.

Common Roof Defects Found During a Survey

A surveyor may identify several different roofing defects during a property inspection.

Slipped, Cracked or Missing Tiles

Slipped, cracked or missing tiles can leave the roof vulnerable to water ingress.

A small number of damaged tiles can often be repaired without replacing the entire roof. However, widespread tile deterioration may indicate that the roof covering is reaching the end of its serviceable life.

Ageing Roofing Underlay

The underlay or roofing membrane sits underneath the tiles and provides an additional layer of protection against moisture.

Older roofs may contain traditional roofing felt that has become brittle, torn or damaged over time.

A surveyor may not be able to inspect all of the underlay, but visible deterioration within the loft could result in a recommendation for further investigation.

Damaged Lead Flashing

Lead flashing is normally installed around chimneys, roof junctions, valleys and other vulnerable areas.

Cracked, loose or poorly installed flashing can allow rainwater to enter the property. Water staining around a chimney breast is often linked to defective flashing, although other causes must also be considered.

Deteriorating Ridge or Hip Mortar

Traditional ridge and hip tiles may be secured using mortar.

Over time, the mortar can crack, crumble or become loose because of weather exposure and natural movement within the roof.

Localised repointing may be possible, but widespread deterioration could require the ridge or hip tiles to be removed and reinstalled.

Blocked or Damaged Gutters

Blocked, leaking or poorly aligned gutters can cause rainwater to overflow onto external walls.

This can contribute to dampness, staining and damage to fascias, soffits or brickwork.

Gutter defects are usually considered maintenance issues, but they should still be resolved before they cause more extensive damage.

Signs of Water Ingress

Surveyors will look for water stains, damp patches, damaged insulation and discolouration within the loft.

Water ingress does not always identify the exact point where the roof is leaking. Rainwater can travel along timbers or roofing materials before becoming visible inside the property.

A roofing inspection may therefore be needed to locate the source of the leak.

Poor Loft Ventilation

Insufficient ventilation can allow warm, moisture-filled air to become trapped within the loft.

This may cause condensation, damp insulation, mould growth and deterioration of roof timbers.

Condensation can sometimes be mistaken for a roof leak, so the cause should be investigated carefully before repairs are recommended.

Timber Decay

Where roof timbers are visible, the surveyor may check for signs of rot, moisture damage, insect activity or previous structural alterations.

Serious timber deterioration may require further investigation by a roofing contractor or structural engineer.

Sagging or Uneven Roof Lines

A visibly sagging roofline may indicate movement or deterioration within the roof structure.

Possible causes include:

• Age-related movement
• Weak or damaged rafters
• Inadequate structural support
• Excessive weight from replacement roof coverings
• Historic alterations
• Long-term water damage

Some older roofs have minor natural movement that has remained stable for many years. However, significant or recent sagging should always be investigated.

What Does “Further Investigation Is Recommended” Mean?

The phrase “further investigation is recommended” is often misunderstood by homeowners and buyers.

It normally means that the surveyor has identified a possible concern but cannot confirm its exact cause, seriousness or repair requirements during the standard property survey.

They may recommend that the roof is inspected by a competent roofing contractor before contracts are exchanged or before expensive decisions are made.

This recommendation does not automatically mean that:

• The roof needs replacing
• The property is unmortgageable
• The roof is structurally unsafe
• Major repairs will definitely be required

It simply means that more information is needed.

A roofing contractor should be able to provide photographs, explain the defects and outline the available repair or replacement options.

Can Roof Problems Affect a Mortgage?

Roof defects can affect a mortgage application where the lender believes that the condition of the roof could reduce the property’s value or make the property unsuitable security for the loan.

Minor maintenance issues, such as a slipped tile or blocked gutter, will not normally prevent a mortgage from being approved.

However, more substantial concerns may result in the lender requesting:

• A specialist roofing report
• Repair quotations
• Evidence that repairs have been completed
• A retention from the mortgage funds
• Additional advice from a structural engineer

A mortgage retention means that the lender temporarily withholds part of the mortgage until specified repairs have been completed.

The exact response will depend on the lender, the property and the seriousness of the defects identified.

Should You Repair or Replace the Roof?

A survey report mentioning roofing defects does not automatically mean that the entire roof needs to be replaced.

Repairs may be suitable where:

• Damage is limited to a small area
• Most tiles or slates remain in good condition
• The roof structure is sound
• The underlay remains serviceable
• The issue has a clear and repairable cause
• There is no widespread water damage

A complete roof replacement may be more appropriate where:

• The roof covering has reached the end of its serviceable life
• Defects are widespread
• The underlay has significantly deteriorated
• Roof timbers require extensive repairs
• The property has experienced repeated leaks
• Previous patch repairs are beginning to fail
• Continuing repairs are no longer cost-effective

The decision should be based on the condition of the complete roofing system rather than one isolated defect.

What Should You Ask a Roofing Contractor?

When arranging a specialist roof inspection, ask the contractor to provide a clear explanation of what they have found.

Useful questions include:

• What defects have been identified?
• What is causing the problem?
• Can the roof be repaired?
• Is a replacement necessary?
• How long is the existing roof likely to remain serviceable?
• Are there signs of structural damage?
• Will any roof timbers need replacing?
• Are photographs available?
• What materials would be used?
• Is scaffolding included?
• Is waste removal included?
• What guarantees are provided?
• Will Building Regulations apply?
• Are there any additional costs that may arise once work begins?

A professional contractor should explain the available options without pressuring you into unnecessary work.

Using the Survey to Negotiate a Property Purchase

Where a roof inspection identifies significant defects, buyers may use the findings to renegotiate the purchase price.

Possible options include:

• Asking the seller to complete repairs
• Requesting a reduction in the purchase price
• Agreeing that the cost of the work will be reflected in the sale
• Obtaining several quotations before proceeding
• Delaying exchange until further investigations are complete

Any negotiations should be handled through the buyer’s solicitor or estate agent.

A written roofing report and detailed quotation can provide useful evidence when discussing the condition of the property.

Does an Older Roof Automatically Need Replacing?

No. The age of a roof is only one factor that should be considered.

A well-maintained older roof may remain serviceable for many years, while a newer roof could experience problems because of poor workmanship, unsuitable materials or inadequate ventilation.

The current condition of the tiles, underlay, flashings, drainage and roof structure is usually more important than age alone.

Arrange a Professional Roof Inspection

A property survey provides a valuable overview of the roof’s visible condition, but it may not provide enough detail to decide whether repairs or replacement are required.

If your survey report highlights roofing concerns, arranging a specialist inspection can help you understand:

• The nature of the defects
• The urgency of any work
• Whether repairs are possible
• Whether replacement should be considered
• The likely cost of the recommended work

Countrywide Roofing & Insulation provides professional roof inspections and no-obligation quotations for homeowners and property buyers across England and Wales.

Our team can inspect the roof, provide photographs of visible defects and clearly explain the most appropriate options.

Conclusion

A survey report is the beginning of the decision-making process, not the final verdict on the condition of a roof.

Surveyors look for visible defects, evidence of water ingress, structural concerns and signs that significant expenditure may be needed. However, they cannot normally lift roof coverings or investigate concealed sections of the roofing system.

Understanding what surveyors can and cannot inspect helps homeowners and buyers make more informed decisions.

Where roofing concerns are highlighted, arrange an inspection with an experienced roofing contractor before agreeing to major repairs, negotiating a property purchase or committing to a complete roof replacement.

Frequently Asked Questions

Does a surveyor inspect the whole roof?

A surveyor will inspect the parts of the roof that are safely visible and accessible. They will not normally lift tiles, remove insulation or dismantle sections of the roof.

Can a surveyor tell if I need a new roof?

A surveyor can identify visible concerns and comment on the roof’s general condition. However, they may recommend a specialist roofing inspection before confirming whether repairs or replacement are required.

Should I worry if my survey report mentions the roof?

Not necessarily. Many survey reports include precautionary recommendations. The issue may only require straightforward maintenance or localised repairs.

Will a bad roof survey stop me getting a mortgage?

Minor defects will not normally prevent mortgage approval. Significant structural problems or widespread deterioration could result in the lender requesting further reports, quotations or repairs.

Who should inspect the roof after a property survey?

The roof should be inspected by an experienced and appropriately insured roofing contractor. Structural concerns may also require advice from a structural engineer.

Should I get a roof inspection before buying a house?

A roof inspection is sensible where the property survey identifies defects, the roof is particularly old, access was restricted or substantial roofing work may be required.