Clay vs Concrete Roof Tiles — Which Is Right for Your Horsham Home?

Clay vs Concrete: The Honest Comparison

If you're replacing a roof in Horsham, the choice between clay and concrete tiles is one of the most significant decisions you'll make. Both work. Both are suitable for the West Sussex climate. But they have meaningfully different characteristics over a 20–40 year ownership horizon.

Why Concrete Became the Standard — and Why That's Changing

Concrete interlocking tiles dominated post-war house building in Britain because they were faster to lay and significantly cheaper than clay. The large estates built across Roffey, Littlehaven and Broadbridge Heath in the 1960s–80s all used concrete tiles for this reason. At the time, a 40-year lifespan was acceptable — these were houses being built to a budget. Forty years later, we're seeing the results: widespread nail sickness, surface aggregate loss and the growing demand for replacement.

Modern concrete tiles are better than their 1970s equivalents, but clay has become increasingly competitive in price as manufacturing has scaled up. For a re-roof on a property you plan to own for 20+ years, clay delivers better long-term value even at a 20–30% price premium.

The Horsham Housing Stock Context

For Victorian and Edwardian properties in the town centre — around Denne Road, Park Street and The Causeway — clay plain tile is either the original material or the planning-appropriate specification. Concrete interlocking tiles are not suitable for these properties and in conservation areas would not receive planning approval. We source reclaimed clay tiles to match existing roof coverings on period properties throughout Horsham.

For 1990s–2000s properties in Southwater, Broadbridge Heath and the newer estates, modern clay interlocking tile is the specification we most frequently recommend. It matches the profile of the original concrete tiles while delivering significantly better longevity.

What About Cost Over Time?

If you're replacing a 1970s concrete tile roof and choosing between modern concrete and clay:

• Concrete interlocking: approximately £45–£65/m² installed. Expected life 40–60 years.
• Modern clay interlocking: approximately £65–£90/m² installed. Expected life 60–80 years.

On a typical 3-bed semi (60m² roof area), the difference is roughly £1,200–£1,500. Over a 60-year life, the concrete roof will likely need replacing once, the clay roof may not. The clay tile is the more economical choice over the full ownership horizon for most Horsham properties.

What Changes at 40 Years — The Concrete Tile Threshold

Concrete tile roofs installed in the 1970s and 1980s are now entering their most demanding maintenance phase. At 40–50 years, three things typically happen in close succession: the steel nails corrode and begin failing mechanically, the surface aggregate erodes and increases water absorption, and the ridge and hip mortar beds crack after 40–50 freeze-thaw cycles. This combination means a roof that was in reasonable condition at 35 years can deteriorate visibly in a short period.

The critical decision at this stage is the 40% rule: if more than 40% of tiles are affected by nail sickness, the cost of systematically identifying and re-fixing each tile approaches the cost of a full re-roof — and the remaining unaffected tiles will continue to fail in subsequent years regardless. Below 40%, targeted re-nailing and mechanical re-fixing is viable. We assess this during the survey and give an honest recommendation on repair versus replacement based on the actual count, not a rule of thumb.

Getting the Work Done in Horsham

All surveys in Horsham are free with no call-out fee. We attend within 3–5 working days for planned surveys and aim to reach emergency call-outs within 2–4 hours. Every job receives a written, itemised, fixed-price quote before any work starts — no verbal estimates and no bills that exceed the accepted written quote.

We are NFRC registered and carry £5 million public liability insurance. All work carries a written 10-year workmanship guarantee backed by a named, verifiable local contractor. Guarantee and insurance documentation is provided on request before any survey visit.

We cover Horsham and the surrounding West Sussex area including Roffey, Broadbridge Heath, Southwater, Billingshurst, Pulborough, Storrington, Henfield, Crawley, Burgess Hill, Haywards Heath, East Grinstead and Worthing. Call 0140 358 1272 to arrange a free survey.

Last reviewed: July 2026 by Horsham Roofing Experts.