Signs your Brighton roof needs replacing rather than repairing include widespread nail sickness, crumbling or carbonating concrete tiles, multiple leaks in different areas, and batten rot found on inspection. When the 10-year repair cost approaches replacement cost, replacement is the sounder investment.
Signs That Point Toward Replacement
Widespread Nail Sickness on Concrete Tile
When more than 30-40% of tiles are no longer mechanically fixed, the cost of systematic refixing approaches re-roofing cost. When nail sickness is near-universal — as it is on most Saltdean, Peacehaven and Moulsecoomb properties built before 1960 — re-roofing is almost always more cost-effective than repair over any horizon beyond 5 years.
Mechanical Tile Failure: Crumbling Edges and Broken Nibs
Concrete tile that is carbonating crumbles at the edges and loses the nibs that hook over the battens. Individual tile replacement is uneconomic when this is widespread — and often impossible because the discontinued profiles are no longer manufactured. When you cannot reliably source matching replacement tiles, repair has a hard limit.
Multiple Leaks in Different Locations
A single leak in one location is a repair. Multiple leaks in different locations — particularly if the felt underlay has failed or is absent — indicates the whole roof covering is failing. Addressing each leak individually is addressing symptoms rather than the cause.
Batten Rot Revealed During Inspection
When an inspection reveals widespread batten rot, the battens need replacing regardless of tile condition. The tiles must come off to replace the battens. Once the tiles are off and the battens replaced, re-tiling with new tiles is typically marginally more expensive than re-tiling with the old tiles. At this point, re-roofing with new materials is the logical choice.
The 10-Year Cost Calculation
This is the most useful framework for borderline cases. If repair costs £X now and we can reasonably anticipate further repair costs in years 3, 5 and 8 based on the current condition, total the 10-year repair cost and compare it to replacement. Add the cost of the replacement that is still coming at year 10 even if you repair now.
We work through this calculation during the free survey and give you honest numbers for both options. The answer is not always replacement — but when it is, we tell you clearly rather than proceeding with repair that isn't the right answer.
Key fact: The Concrete Tile Manufacturers Association sets a design life of 30–50 years for concrete interlocking tiles, meaning Brighton's pre-1970 estate roofs — Moulsecoomb, Whitehawk, Saltdean — are structurally at or past end of life.
Signs That Point Toward Repair (Not Replacement)
- The problem is localised — single failed flashing, handful of broken tiles, section of ridge mortar
- The surrounding roof is in good structural condition — tiles mechanically sound, battens dry, felt intact
- Clay or slate tile that is 60-80 years old — these materials typically have significant remaining life; the infrastructure around them (mortar, lead, fixings) needs attention, not the tile itself
- The 10-year repair cost is substantially less than replacement
The Free Survey: Why It Matters
The repair vs replacement decision cannot be made from ground level or from the loft. It requires roof-level access — lifting tiles in representative locations to assess batten and felt condition; checking nail condition; assessing tile carbonation and mechanical integrity. We carry out this assessment as part of every free survey. You'll leave with a clear picture of both options and the honest cost comparison.
Call 01273 973 996 to arrange a free survey across Brighton and East Sussex.
Getting the Right Roofer for This Job
The quality difference between roofing contractors in Brighton is significant — not just in price but in knowledge, specification and materials. For any job involving conservation area materials, lime mortar on Victorian properties, code 5 lead in coastal positions, or nail sickness assessment on older concrete tile, you need a roofer with specific experience of Brighton's housing stock.
The right way to assess a roofer for your job: ask specifically about their experience with your property type and the specific work required; ask for references from comparable recent jobs you can call; verify NFRC registration independently at nfrc.co.uk; get a written quote that specifies materials, not just a price.
What to Ask Before You Book
- Have you done this type of work on similar properties in Brighton?
- What mortar specification do you use on Victorian properties? (Answer should be lime)
- What lead code do you specify for this position? (Code 5 for exposed coastal)
- Can you provide references from similar recent jobs?
- Is your NFRC registration current? (Verify at nfrc.co.uk)
- What does the written guarantee cover and for how long?
We carry out free surveys across Brighton and East Sussex. Call 01273 973 996 to arrange.
The Honest Conversation We Have With Brighton Homeowners
Every roofer has a financial incentive to recommend work. We try to have the honest conversation rather than the commercially convenient one — which sometimes means telling a Brighton homeowner that their roof does not need replacing yet, and sometimes means telling them that repair is the wrong answer.
When We Tell Brighton Homeowners to Repair, Not Replace
A Victorian clay tile roof on a Hanover terrace at 110 years old with a localised lead valley failure and three slipped tiles: repair is the right answer. The tile has 30-50 years of remaining life. The valley repair costs £600-£900. Re-roofing costs £8,000-£12,000. There is no financial case for replacement, and we say so clearly.
A 1950s concrete tile roof in Hollingbury showing localised nail sickness affecting two roof slopes: repair and selective refixing is the right answer. The adjacent slopes are in good condition with sound nail fixings. Systematic refixing of the two affected slopes costs £800-£1,200. Re-roofing costs £9,000-£14,000. Repair is the right answer for another 10-12 years.
When We Tell Brighton Homeowners to Replace, Not Repair
A 1935 concrete tile roof in Saltdean with near-universal nail sickness, carbonating tile edges, discontinued profile: replacement is the right answer. Systematic refixing costs £2,500-£3,500 but cannot address the carbonating tile. Re-roofing costs £9,000-£13,000. The repair buys 5-7 years at best. The 10-year cost of repair exceeds replacement.
A 1960s concrete tile roof in Moulsecoomb with widespread nail sickness, batten rot found during survey, and multiple active leaks: replacement is the right answer. The battens need replacing regardless — the tiles must come off. With the tiles off and battens replaced, new tiling adds marginally to the cost. The roof needs replacing.
Frequently Asked Questions
Key indicators: the roof is concrete tile more than 50 years old with widespread nail sickness; multiple leaks in different locations; batten rot revealed during inspection; the 10-year repair cost approaches replacement cost; tile profiles are discontinued making like-for-like replacement impossible.
Widespread nail sickness combined with mechanical tile failure (crumbling edges, broken nibs on concrete tile). When both are present, the roof cannot be reliably repaired — it needs replacing.
Yes. Nail sickness is invisible from ground level — the tiles appear in place but are not mechanically secured. Carbonating concrete tile appears intact until it starts to crumble at the edges. A roof-level inspection reveals what ground-level observation cannot.
A full replacement on a standard Brighton semi costs £8,000-£14,000. If a roof needs £1,500 of repairs now and is likely to need £1,200 more in year 3 and £1,500 more in year 6, the 10-year repair cost approaches replacement cost — and the replacement at year 10 is still coming. We work through this calculation honestly during the free survey.
Last reviewed: 21 July 2026 · Brighton Roofing Experts