The most expensive roofing mistake is replacing a roof that only needed a repair — or patching one that needed replacing. Here is the honest decision framework, both ways, so you spend your money where it actually counts.
Tell us the job in 30 seconds. No pushy sales, no call-out fee.
📞 Call Now: 01243 278085Repair your Chichester roof when failure is localised and the covering has life left; replace when more than about 30% has failed, when nail sickness is widespread, or when repairs recur several times a year. The honest test is cost per remaining year of roof life. Call 01243 278085.
Every roof reaches a point where repair stops making sense and replacement takes over. The skill — and the honesty — is in judging exactly where that point is for your roof, and not a moment before. Push replacement too early and you waste thousands on a roof with life left. Cling to repairs too long and you pour money into a roof that is failing faster than you can patch it.
The concrete-tile estates built along Stane Street and Bognor Road are now at the age where nail sickness is spreading. Early on, tile replacement and re-nailing is good value. But once tiles are lifting by hand across multiple slopes, you have crossed the 30% line — and a full re-roof, at £6,500–£11,500 for a semi, resets the clock for another 40–60 years. Repairing past that point is money wasted.
These original slate and clay roofs are often a century old. Where the covering is sound but the nails have failed, a strip-and-relay saves 70–85% of the original slate and is far better value than all-new material. Where the slate itself has delaminated and shattered across the slope, replacement in matched natural slate is the honest answer — and in conservation areas, the only compliant one.
The interwar stock along College Road and Swanfield Drive typically has clay tile roofs with failing felt underlay and tired ridge bedding. A single slipped area is a repair. Widespread ridge and underlay failure with slipping across slopes tips toward replacement — and the survey tells you which.
The single most useful way to decide is cost per remaining year of roof life. A £300 repair that buys ten more years costs £30 a year. A £300 repair on a roof that will fail again next winter costs £300 a year — and the one after that, and the one after that. Cheap repairs on a dying roof are the most expensive roofing you can buy.
A full re-roof at £10,000 sounds like a lot until you divide it by 50 years of service life: £200 a year, for a roof that needs nothing else in that time. When the annual repair spend on an old roof consistently approaches or exceeds that figure, the maths has already made the decision — replacement is the cheaper option, not the dearer one.
| Situation | The honest call |
|---|---|
| One slipped or cracked tile, rest sound | Repair |
| A single failed valley or flashing | Repair |
| Localised damage, roof under 40 years | Repair |
| Nail sickness across multiple slopes | Replace / relay |
| More than ~30% of a slope failed | Replace |
| Repairs needed several times a year | Replace |
| Sound slate, failed nails only | Strip and relay |
| Widespread slate delamination | Replace |
The decision should never be guesswork. Our free survey inspects every slope, checks the fixings by testing whether tiles lift, assesses the underlay from the loft where accessible, and rates the covering’s remaining life. On tall or complex Chichester roofs we use a drone to reach angles a ground inspection cannot. You get a written report with the honest comparison — the cost of repairing now versus the cost and remaining-life benefit of replacing — so the decision is informed and yours.
| Option | Typical cost | Buys you |
|---|---|---|
| Targeted repair | £150–£900 | Years, if the rest is sound |
| Strip and relay (slate) | £5,500–£9,000 | Reuses 70–85% of your slate |
| Concrete tile re-roof (semi) | £6,500–£11,500 | 40–60 years |
| Clay tile re-roof (semi) | £9,500–£15,500 | A century, conservation-correct |
| Natural slate re-roof (semi) | £11,000–£18,500 | 100+ years |
All figures supplied and fitted at the southern England baseline. See our new roof cost guide and repair cost guide for full breakdowns.
Whichever the right answer is for your roof, the work carries our written 10-year workmanship guarantee, with manufacturer warranties on materials on top. A repair is guaranteed on the repaired section; a re-roof is guaranteed in full and transfers if you sell.
Stock-condition assessment weighs remaining service life against the cost of intervention; repeated minor repairs on an element near end of life are rarely economic compared with planned replacement.
— RICS / BRE stock-condition guidance
Not sure which you need? Book a free survey for an honest, both-ways assessment
📞 01243 278085"They told us our Summersdale roof only needed a repair when another firm had quoted a full re-roof. Saved us thousands. Honest people."
"Straight answer that our century-old slate was ready for a relay, not endless patching — and they saved most of the original slate. Great value."
"No hard sell either way. They laid out the numbers for repair versus replace and let us decide. Ended up repairing and it has held perfectly."
Repair when the failure is localised and the rest of the covering is sound. Replace when more than about 30% of a slope has failed, when nail sickness is widespread across slopes, or when you are paying for repairs several times a year. The deciding measure is cost per remaining year of roof life.
A practical rule of thumb: when more than roughly 30–40% of a roof slope has failed — slipped, cracked or nail-sick tiles across the area — repairing tile-by-tile costs more over time than a full re-lay, because the untouched tiles are close behind. Below that threshold, targeted repair is usually the better value.
If only one area has failed and the rest of the covering is sound with years of life left, a full re-roof is oversell. A targeted repair is the honest answer. A roofer who quotes a full replacement for a single slipped-tile area is not giving you straight advice — and we will tell you when repair is genuinely the right call.
Age matters through remaining service life. A repair on a roof with decades left is good value; the same repair on a Portfield concrete roof at the nail-sickness stage, or an original Victorian slate roof with widespread failure, may be throwing money at a roof that needs replacing within a season or two.
Nail sickness is the corrosion of the iron nails fixing tiles or slates, causing them to slip after 80–120 years. Once it is widespread across slopes — common on Chichester’s Victorian and post-war stock — individual repairs cannot keep pace, because the next slip is always somewhere new. That is the classic trigger for a re-lay or re-roof.
Yes — that is exactly what our free survey provides. We make our living from both repairs and re-roofs, so we have no incentive to push you either way. We give you the cost of both options and the honest comparison, and the decision is yours.
Often, yes. On a Victorian slate roof where the slate is sound but the nails have failed, a strip-and-relay refixes your original slate with new copper or stainless nails to BS 5534. Typically 70–85% of a well-aged Welsh slate roof goes back on — far cheaper than all-new slate.
A free survey and a straight answer — repair or replace, whichever genuinely serves you. Call your local Chichester roofer.
01243 278085 ✉ Email UsA sound roof with one failed area does not need replacing, and a homeowner who is told otherwise is being oversold thousands of pounds of unnecessary work. We regularly survey Chichester roofs that another firm has quoted for full replacement, and find a covering with fifteen or twenty years of life left that needs nothing more than a valley reline or a run of re-bedded ridge. The honest answer costs a few hundred pounds, not ten thousand — and that honesty is exactly what a homeowner deserves.
The opposite mistake is just as costly over time. A roof at the nail-sickness stage — common on Chichester’s post-war estates and century-old terraces — will keep failing, somewhere new each time, no matter how many individual tiles you refix. Each repair feels cheap in isolation, but the running total climbs past the cost of a re-roof while the interior takes water damage in between. When the survey shows widespread failure, continuing to patch is throwing good money after bad, and we will tell you so plainly.
Our coastal position sharpens the decision. Salt-laden south-westerlies and harbour humidity accelerate the corrosion of fixings and the oxidation of lead, so a roof here reaches its decision point a little sooner than the same roof inland. On the exposed Manhood Peninsula — Selsey, the Witterings, Pagham — wind loading and driven rain push tired roofs past the tipping point faster still. We factor this local exposure into every repair-or-replace assessment.
Some roofers make more from re-roofs and steer every survey that way; others avoid the disruption of big jobs and under-recommend. We do both repairs and replacements in volume across Chichester, so we have no reason to push you either direction. The survey gives you the facts and the numbers for both options, and the decision stays yours — which is how it should be.