Ridge tiles sit along the apex of a roof and take more weather than anything else on it. When they lift, slip or start dropping mortar into the gutter, the question people ask is what replacement costs, and the honest answer is that the tiles themselves are the small part. What moves the price is how the ridge is going to be fixed, how the roofer is going to reach it safely, and how much of the timber underneath turns out to be sound once the old bedding is off.
What ridge tile replacement actually involves
The old ridge tiles are lifted and the mortar bed under them is cut away, which is usually the dirtiest part of the job and the reason a quote should say where the debris goes. What is underneath is then visible for the first time in decades: the ridge board or the tops of the rafters, the felt or membrane dressed over them, and the top course of tiles or slates either side. A roofer who finds soft timber there is looking at a different job from the one that was quoted, which is why the quote should say what happens if they do rather than leaving it to the day.
Mortar bedding against a dry ridge system
For most of the twentieth century a ridge was bedded in sand and cement and nothing else held it down. Mortar is rigid, a roof moves, and British weather works at the crack until water gets behind the bed and the tile is sitting on very little. Current practice is that ridge and hip tiles are mechanically fixed rather than relying on the bedding, either screwed through a dry ridge system with a ventilated roll under it or mechanically fixed alongside a mortar bed. A dry system usually costs more on the quote and removes the failure that brought you to the page, which is the trade off worth understanding before comparing two prices.
Access is most of the price when there are few tiles
A ridge runs along the highest line of the roof, so nobody reaches it from a ladder safely and a competent roofer will not try. That means a tower or a scaffold, and on a short ridge the access can cost more than every tile and every hour of labour put together. This is why replacing a handful of ridge tiles rarely looks cheap, and why a quote that is much lower than the others is usually a quote for somebody working without the access they need. Work at height on roofs is the single largest source of fatal injury in construction, and the access line is where a quote tells you whether that has been taken seriously.
What a ridge tile quote should tell you
It should say how many ridge tiles, or how many linear metres of ridge, are being done, because half a ridge and a whole ridge are different jobs. It should name the fixing system rather than saying re bed, so you can tell a dry ridge from a mortar repair. It should price the access as its own line. It should say whether the tiles are being reused or replaced, since sound ridge tiles are often lifted and refitted. And it should say what happens if the timber under the bedding is rotten, which is the variation most likely to arise on a roof old enough to need this work.
Questions people ask about ridge tile replacement cost
How do I know if my ridge tiles need replacing?
The signs are visible from the ground with binoculars: a ridge tile sitting proud of the line, a gap where the mortar has fallen out, pieces of mortar in the gutter or on the drive, and moss growing in the joint. Water getting in at the ridge shows up as a damp patch near the top of an upstairs ceiling or in the loft at the apex, so a look in the loft on a wet day tells you a great deal.
Can ridge tiles be re bedded instead of replaced?
Often yes. If the tiles themselves are sound, which they frequently are, they are lifted, cleaned off and refitted, and the cost is the labour and the access rather than new tiles. What should not happen is a fresh mortar bed with nothing mechanical holding the tiles down, because that is the arrangement that failed in the first place.
Do I need scaffolding to replace ridge tiles?
Something more than a ladder, yes. A tower may be enough on a low roof with clear ground around it, and a scaffold is normal otherwise. It is not an upsell: the ridge is the highest line on the building and reaching it is the part of the job with the real risk in it.
Is ridge tile work notifiable under the building regulations?
A like for like repair to part of a roof covering is normally maintenance rather than notifiable building work. Replacing a large area of covering can be a different matter, and where the work is notifiable a contractor registered on a competent person scheme can certify it themselves rather than involving building control. If you are near that line, ask the roofer which side of it the job falls on and get the answer in writing.
How long should a new ridge last?
A mechanically fixed ridge should outlast the mortar arrangement it replaced by a wide margin, because the fixing no longer depends on a rigid bed staying intact on a roof that moves. The tiles themselves usually last as long as the rest of the covering; it is almost always the bedding, not the tile, that brings somebody up there.