Do I Need a New Roof? Checklist for Tile and Slate Pitched Roofs

Your roof probably needs replacing if you are seeing regular leaks, widespread tile damage, sagging, or visible daylight in the loft, especially on a roof that is already approaching the end of its expected lifespan (often 50–75 years for concrete tiles, potentially 100+ years for good slate). Use this checklist to work methodically through all common pitched roof coverings – concrete and clay tiles, natural and fibre‑cement slate, and lightweight or metal tiles – before you call a roofer.

Quick Age and History Checks

• Check the age of the roof covering.
• Concrete tiles often last around 50–75 years in the UK, depending on installation quality and exposure.
• Well‑installed clay tiles and natural slate can last 80–100+ years, but fixings, battens and underlay usually fail earlier.
• Ask or check paperwork for any past re‑roofing, overlays or major repairs.
• If you are seeing frequent issues on a covering that is already near its typical lifespan, full replacement is usually more cost‑effective than piecemeal repairs.
• Note how often roofers have been out recently.
• Tiles “coming down” more and more often on an older roof is a common sign that wholesale renewal is due, not just another small repair.

Loft Interior Checklist

• Go into the loft on a bright, dry day.
• Look for any streaks of daylight coming through between tiles, slates, around chimneys or at the ridge; light paths often track where water will get in during heavy rain.
• Use a torch to check for dark, damp staining on rafters, sarking boards, felt and insulation, especially under valleys and around penetrations.
• Check for rot and movement in the structure.
• Soft, crumbling, or blackened rafters or purlins point to long‑term moisture and possible structural weakening, which may mean the roof deck and coverings must be stripped and rebuilt.
• Any noticeable sagging in rafters, or deflection between purlins, is a red flag that should be assessed promptly by a professional roofer or structural engineer.

If you are planning a solar PV system, Atlantic Renewables’ team of experts will always start with a loft and roof integrity check before installation, and can advise if replacement is sensible before adding panels.

External Roof Surface Checklist

Walk around the property (from ground level) and use binoculars if needed.

• Look for missing or slipped coverings.
• Missing or slipped concrete or clay tiles, natural slate or fibre‑cement slate expose the underlay, which can degrade rapidly in UV and wind, leading to leaks and eventual deck damage.
• If damage is localised, repair may be fine; if slipped or broken pieces are visible across several elevations, replacement is likely more economical.
• Inspect for cracked, spalled or warped units by type:
• Concrete tiles: check for surface crumbling, deep cracks, or heavy moss that traps moisture and accelerates freeze–thaw damage.
• Clay tiles: look for severe surface flaking or frost damage, especially on north‑facing slopes and older roofs.
• Natural slate: look for cracked, delaminating or “cupped” slates and lots of small pieces in the gutters.
• Fibre‑cement slate or lightweight metal tiles: check for impact damage, rust staining, coating loss or cracked edges.
• Check ridge, hips and verges.
• Mortar at ridges and hips typically needs repointing every 10–15 years; widespread failure or loose ridge tiles increase wind‑uplift risk and often accompany other age‑related problems.
• On dry‑fix systems, look for missing clips, caps, or slipped units that may signal underlying batten or fixings failure.

If you are unsure whether the damage you see is cosmetic or serious, Atlantic Renewables can arrange for one of our engineers to visually survey the roof while assessing suitability for solar or battery storage.

Sagging Lines, Gutters, Chimneys and Junctions

• Stand back to view the overall roof line.
• A straight ridge and even planes are healthy; dips, bellies, or a “wavy” look can suggest failing rafters, overloaded structure or rotten decking, all of which often require more than a simple repair.
• Sagging along the eaves may be related to long‑term water saturation at gutters or rotten fascia timbers.
• Inspect gutters and eaves.
• Persistent overflowing gutters, green staining on brickwork, or rotten soffits and fascias frequently start with failed tiles or flashing higher up, not just blocked gutters.
• Large amounts of tile or slate fragments and grit in gutters indicate progressive surface breakdown of the covering, signalling the roof is nearing the end of its life.
• Look at chimneys, valleys, and abutments.
• Failing lead or cement flashing around chimneys and at roof–wall junctions is one of the most common leak sources in older UK roofs.
• If flashing is sound but you still have damp internally, water may be tracking through porous or saturated tiles or slates – another sign a more comprehensive replacement is needed.

Damp, Mould and Energy Performance Inside the Home

• Check upstairs ceilings and walls.
• Brown water marks, blistering paint or peeling paper under roof slopes, especially after heavy rain, signal recurring moisture ingress rather than one‑off condensation.
• Repaired ceilings that stain again in the same place point to an unresolved roofing issue, not just an internal leak.
• Look for mould patterns.
• Localised black mould patches at ceiling corners adjacent to the roofline can indicate cold bridging from saturated or poorly insulated roof structures.
• Widespread mould combined with a musty loft smell and damp insulation suggests poor ventilation and possibly failed underlay, which may justify renewing the whole roof build‑up.
• Consider energy and comfort.
• A tired, leaky roof with poor insulation can significantly increase heat loss; around 25% of a typical home’s heat is lost through the roof if uninsulated, according to the Energy Saving Trust.
• If you are already upgrading to solar PV or heat pumps, it often pays to combine roof renewal and additional insulation in one project to lock in lower bills and better comfort.

When Repairs Are Enough vs When to Replace

Use this mini‑decision checklist:

• Repairs may be enough when:
• The roof covering is well within its expected lifespan (for example, a 25‑year‑old concrete tile roof with only a few cracked tiles).
• Problems are clearly localised (for example, one slipped slate in a valley, or a bit of cracked lead flashing) and there is no sagging or widespread damp.
• Replacement is usually the better option when:
• The roof is approaching or beyond typical lifespan, and you see frequent slipped or broken tiles or slates across multiple slopes.
• There is structural sagging, rotten rafters or deck, or repeated internal leaks from different areas of the roof.
• You plan to add significant loads such as solar panels and the existing covering or structure is already marginal.
• Budget‑planning tip for UK homeowners:
• In 2025, guides suggest a typical new pitched roof on a UK home averages around £7,000, with a range roughly from £4,000 to £19,000 depending on size, complexity and tile type (hip vs gable, slate vs concrete).
• That equates to about £110–£285 per m² including materials and labour, excluding extras like insulation upgrades, scaffolding complications or structural repairs.

When Atlantic Renewables designs a solar PV and battery system, our team will always factor in these costs and timings, advising whether to proceed now, delay, or coordinate a re‑roof with PV to save on scaffolding and access.

Get in Touch

If you suspect your pitched roof might need more than just a quick repair and you are also considering solar PV or battery storage, get in touch with Atlantic Renewables and our team of experts can help you decide the most cost‑effective route. Whether you need roof checks ahead of a solar installation, guidance on combining a re‑roof with PV, or have issues with an existing solar system, please contact Atlantic Renewables and our engineers will be happy to help. Call us on 0161 207 4044 or email This email address is being protected from spambots. You need JavaScript enabled to view it. to start making your roof and renewable energy setup work harder for your home.