Roofing Advice
Should I repair or replace my roof?
Whether to repair or replace a roof depends on its age, how widespread the problem is, and whether the same area keeps needing repairs — a roof with one isolated fault usually just needs a repair, while widespread nail sickness, several unrelated leaks, a sagging roofline, daylight visible through the roof, or timbers a survey has flagged as compromised usually point toward replacement. This is guidance, not a diagnosis — only an on-roof inspection can confirm which one your specific roof actually needs.
The signals that actually matter
Four things genuinely change the answer: the roof covering's age, which symptoms are present, how many times it's already been repaired, and how much of the roof is affected. None of these on its own settles it — it's the combination that matters, which is exactly why a five-minute look from the ground or a single symptom isn't enough to decide either way.
Signs that usually lean toward a repair
An isolated fault — one small area affected, a roof under 10–20 years old, no history of repeated repairs to the same spot — is the profile a targeted, matched repair can usually fix. As our roof-repairs page sets out, most leaks trace back to a handful of common failure points (a slipped tile, perished felt, failed flashing, cracked mortar), and a proper repair traces the fault back to its true source rather than just patching where the damp shows inside.
Signs that usually lean toward replacement
Widespread nail sickness — tiles slipping across large areas as the fixings themselves fail with age — several unrelated leak points, a roof over 30 years old, or timbers a survey has already flagged as compromised are the profile where continuing to patch-repair often ends up treating symptoms rather than the underlying cause. An active leak, a sagging or dipping roofline, and daylight visible through the roof from inside the loft are the more serious individual symptoms — any one of these is worth a proper inspection sooner rather than later, regardless of the roof's age.
Repeated repairs to the same area is a signal on its own
A roof that's been repaired once or twice is a different picture to one where you've lost count. Repairs to the same or a nearby spot, again and again, usually means the repair is treating a symptom rather than the cause — worth flagging honestly during a survey rather than quoting for yet another patch.
Hampshire-specific context: coastal exposure changes the pace, not the logic
The same repair-or-replace logic applies everywhere, but how fast a roof gets there can differ sharply across our coverage area. In severely exposed coastal towns — Gosport's peninsula setting, Portsmouth's island position surrounded by harbour and Solent, Lymington's harbourside streets — salt-laden wind-driven rain accelerates flashing corrosion and ridge wind-uplift, so a roof of the same age can show replacement-leaning signs sooner than an equivalent roof well inland in Basingstoke, Andover or Waterlooville, where age and original build quality tend to matter more than weather exposure.
How to think it through before booking a survey
- Roughly how old is the roof covering — under 10 years, 10–20, 20–30, or 30+?
- Which symptoms are actually present — active leak, sagging roofline, daylight in the loft, slipped tiles, damaged flashing, heavy moss?
- How many times has this exact area been repaired before?
- Is it one small area, a few separate spots, or most of the roof?
- However it stacks up, only an on-roof inspection gives a definite answer — book a free survey rather than guessing from the ground
| Signal | Usually leans | Why |
|---|---|---|
| Roof covering 0–10 years old, one isolated fault | Repair | A single, recent, localised issue rather than a system-wide problem |
| Roof covering 30+ years old | Worth a proper look | Age alone raises the odds of nail sickness and other age-related failure, but doesn't confirm it |
| Active leak inside the house | Get it inspected promptly | Water is already getting past the covering — the underlying cause needs finding, whatever it turns out to be |
| Sagging or dipping roofline | Replacement-leaning | Often points to a structural timber issue that a surface repair can't fix |
| Daylight visible through the roof from the loft | Replacement-leaning | Indicates a genuine gap in the covering, not just cosmetic wear |
| Repairs to the same area several times / lost count | Replacement-leaning | Repeated failure in one spot usually means the repair is treating a symptom, not the cause |
| Heavy moss across most of the roof, no other symptoms | Worth monitoring / repair-leaning | Moss is a real but slower-building issue — see our moss removal guide |
Frequently asked questions
It depends on the roof's age, how widespread the damage is, and whether you've had repeated repairs to the same area before. A roof with one isolated fault is usually a repair; a roof with nail sickness spreading across large areas, several unrelated leak points, or timbers a survey has flagged as compromised usually points toward replacement. Only an on-roof inspection can give you a definite answer — book a free roof survey.
The usual culprits are slipped or cracked tiles/slates, perished felt or underlay beneath the covering, failed flashing around chimneys and valleys, cracked mortar on ridge or hip tiles, and blocked or damaged guttering backing water up under the roof edge. Because water can travel along a rafter before it shows up inside, the visible damp patch isn't always directly above the actual fault.
It's more than cosmetic — moss holds moisture against the roof covering far longer than a clean, exposed tile would experience, and as it thickens it can lift tiles at their edges. Left long enough, it becomes a genuine leak risk rather than just an appearance issue.
Every roof is different, so we can't say for certain without a survey, but as general UK market context: MyJobQuote's 2026 data puts the average roof repair around £530 (range £60–£1,000) against an average new roof around £5,250 — several repeated repairs can genuinely start to add up. That's exactly why a survey looks at whether the underlying cause is being fixed or just patched again, rather than quoting for another repair by default. These figures are general market data, not a quote for your roof.
Book a free roof survey
No pressure, no jargon — just an honest look at your roof and a clear answer.