Repair or Replace Your Roof?

Decision Framework

The Three Questions That Decide

Repair or replace decision tree based on extent of failure, fixings condition and underlay condition — Decision tree: the three tests that determine repair vs replacement

Question 1: How Much Has Failed?

If more than 30–40% of the roof slope is damaged, cracked or slipped, repairing tile-by-tile is almost always more expensive over 5 years than a full replacement. Each repair buys a year or two; the roof keeps failing elsewhere. At this point, replacement is the honest recommendation.

Question 2: Can You Lift Tiles by Hand?

This is the nail sickness test. If tiles lift easily from their battens — the nails have corroded and lost grip — the entire covering is mechanically unsound even where individual tiles look fine. This is common on pre-1980 concrete tile roofs across Binscombe, Aaron's Hill and Ockford Ridge. The solution is a strip and re-lay with new fixings, not tile-by-tile replacement.

Question 3: Is the Underlay Sound?

Check from inside the loft. If the felt or membrane beneath the tiles is torn, brittle, or sagging between rafters, repairing the tiles above is treating the symptom, not the cause. Water will find a way through the failed underlay regardless of how many tiles you replace above it.

The Cost-Per-Year Test

If you are spending £500+ per year on a roof that keeps developing new problems, the cumulative cost exceeds a replacement within 6–8 years. A new roof costs £4,000–£8,000 for a typical Godalming semi and lasts 40–60 years. Do the maths: £6,000 over 50 years is £120 per year. Repeated £500 repairs on a dying roof cost four times as much per year of roof life.

When Repair IS the Right Answer

Isolated storm damage on an otherwise sound roof. A small number of cracked tiles on a roof under 25 years old. A single failed flashing or valley on a roof with decades of life remaining. If the structure, fixings and underlay are all sound, targeted repair is the cost-effective and honest recommendation — even though a replacement would be a bigger job for us.

Godalming Stock by Era — Where They Stand

1930s Ockford Ridge (original clay): 90+ years — most are at replacement threshold. 1950s Binscombe/Aaron's Hill (concrete): 70 years — many past design life. Victorian Farncombe (slate): 120+ years — slate is usually fine, fixings are the question. Edwardian Frith Hill/Busbridge (clay/slate): 100+ years — tile condition varies, underlay is often the weak point. Modern (post-1990): too young to need replacement unless defective or storm-damaged.

Not sure where your roof sits? Call 01483 346 855 for a free survey. We will assess honestly and recommend only what is genuinely needed.

The Age and Condition Matrix

Every roofing material has a design life, but actual lifespan depends on local conditions. In Godalming's damp Wey Valley climate, these lifespans are typically 10–15% shorter than manufacturer estimates based on national averages.

Material	Design Life	Godalming Typical	Status Now
Handmade clay peg tile	80–100 years	70–90 years	Most pre-1940 stock approaching threshold
Concrete interlocking	50–60 years	40–55 years	1950s estates past design life
Welsh slate	100–150 years	90–130 years	Slate usually fine; fixings are the question
Felt flat roof	10–15 years	8–12 years	Any pre-2015 felt is a candidate for replacement
GRP/EPDM flat roof	20–30+ years	20–30 years	Too recent to reach threshold

The 30% Rule in Practice

The 30% threshold is not arbitrary — it is the point at which repair economics break down. Below 30% damage, targeted repairs cost less per year of extended life than a replacement. Above 30%, the remaining 70% of the roof is on the same deterioration curve and will need attention within 3–5 years regardless. You end up replacing 30%, then another 20%, then another 15% — spending more in total than a single replacement would have cost.

We assess this honestly during every survey. If your roof is at 15% failure, we recommend repair. If it is at 40%, we recommend replacement. At 25–35%, we present both options with honest costings and let you decide based on your budget and plans for the property. We do not push replacement when repair will serve — even though replacement is a bigger job for us.

Partial Replacement — The Middle Ground

Not every roof needs a complete strip. If damage is concentrated on one elevation — typically the south-west weather face in Godalming — a partial re-roof addresses the worst section while leaving the sheltered sides intact. This costs 40–60% of a full re-roof and buys 10–20 years for the remaining elevations. We assess and recommend partial approaches where they genuinely make sense.

What a Survey Tells You

Our free survey answers the repair-or-replace question definitively for your property. We check: percentage of tiles damaged or displaced, nail/fixing condition (the nail sickness test), underlay/membrane condition from the loft, batten condition and moisture levels, and structural timber integrity. The report gives you a clear recommendation with costings for both options where applicable. There is no obligation and no hard sell. Call 01483 346 855.

Getting a Free Assessment

The repair-or-replace decision is best made with professional input. Our free survey assesses every component: tile condition and percentage of failure, fixing condition (the nail sickness test), underlay and membrane integrity, batten condition and moisture content, and structural timber soundness. The report gives you a clear recommendation with costings for both repair and replacement options where applicable. We present the numbers honestly and let you decide — we do not push replacement when repair will serve, and we do not recommend cheap patches on a roof that needs replacing. The survey is free, the report is yours to keep, and there is no obligation to proceed with either option. Call 01483 346 855.

Next Steps

If repair is the recommendation: we schedule within 1–2 weeks. Most repairs complete in 1–2 days. If replacement is the recommendation: we provide a detailed specification and quote, schedule a start date, and manage the project from scaffold erection to guarantee handover. Either way, you have a clear plan, a fixed price, and a guaranteed result. Read how we work for the full process walkthrough.

Partial Replacement — The Middle Ground

Not every roof needs a complete strip. If damage is concentrated on one elevation — typically the south-west weather face in Godalming — a partial re-roof addresses the worst section while leaving the sheltered sides intact. This costs 40-60% of a full re-roof and buys 10-20 years for the remaining elevations. We assess and recommend partial approaches where they genuinely make sense.

The Survey That Answers the Question

Our free survey answers the repair-or-replace question definitively for your property. We check percentage of tiles damaged or displaced, nail and fixing condition (the nail sickness test), underlay and membrane condition from inside the loft, batten condition and moisture content measurements, and structural timber integrity. The report gives you a clear recommendation with costings for both options. There is no obligation and no hard sell — we present the numbers honestly. Call 01483 346 855.

What Our Customers Usually Decide

Based on our survey data across the Godalming area, approximately 60% of customers who book a repair-or-replace assessment end up choosing targeted repair. The roof has localised damage but is fundamentally sound — a few hundred pounds fixes the immediate problem and the roof continues to serve. Around 25% choose full replacement — the survey confirms what they suspected, that the roof has reached the end of its economic life. The remaining 15% fall into the middle ground and choose a phased approach: repair the worst areas now, plan and budget for replacement within 2-3 years.

We support all three outcomes equally. There is no financial incentive for us to push you toward the more expensive option — our reputation is built on honest advice, and a customer who trusts our repair recommendation today will call us for the replacement when the time comes. Conversely, recommending repair on a roof that genuinely needs replacing wastes your money on patches and damages our credibility when the inevitable failure occurs.

Insurance and Mortgage Considerations

Home insurance policies require you to maintain your property in a reasonable state of repair. A neglected roof that fails during moderate weather gives the insurer grounds to decline or reduce a claim. Mortgage lenders may require evidence of roof condition during remortgage surveys. A professional roof survey with a clear condition report satisfies both requirements and costs a fraction of the potential consequences of not having one.

If you are selling a property with a roof approaching the end of its life, a pre-sale survey allows you to either fix the issue before listing or price it accurately. Buyers who discover a failing roof during their own survey will use it as a negotiation lever — typically demanding 1.5-2x the actual repair cost as a price reduction. A proactive approach almost always costs less.

Getting started

Book Your Free Survey

Every project starts with understanding your property. Our free survey takes 30–45 minutes, covers every accessible part of your roof, and results in a written report with photographs and clear recommendations. There is no obligation to proceed, no sales pressure, and no call-out charge. The survey fee — where applicable on specialist inspections — is credited in full against any work booked.

We typically attend within one week of your call and deliver the written report within 24 hours of the inspection. For emergencies, we attend within 1–2 hours. Call 01483 346 855 to book.

Why Godalming Homeowners Choose Us

We are NFRC registered, carry £5 million public liability insurance, and guarantee every job for 10 years in writing. Our team is directly employed — no subcontractors, no agency labour, no passed-on responsibility. We have been working on roofs across the Wey Valley for over twenty years. In that time we have completed thousands of jobs on every type of property the area produces, from Victorian slate terraces in Farncombe to 1950s concrete estates at Binscombe, from Bargate stone villas on Frith Hill to modern developments at Ockford Park. Every job has taught us something about how roofs behave in this specific climate, and that accumulated knowledge is what we bring to your property. Call 01483 346 855 for a free, no-obligation survey.

Should You Repair or Replace Your Roof?

The Three Questions That Decide

Question 1: How Much Has Failed?

Question 2: Can You Lift Tiles by Hand?

Question 3: Is the Underlay Sound?

The Cost-Per-Year Test

When Repair IS the Right Answer

Godalming Stock by Era — Where They Stand

The Age and Condition Matrix

The 30% Rule in Practice

Partial Replacement — The Middle Ground

What a Survey Tells You

Getting a Free Assessment

Next Steps

Partial Replacement — The Middle Ground

The Survey That Answers the Question

What Our Customers Usually Decide

Insurance and Mortgage Considerations

Book Your Free Survey

Why Godalming Homeowners Choose Us

Not Sure? We Will Tell You Honestly