A ridge caps the crest of a pitched roof, a row of curved or angled tiles laid where the two slopes meet. On a listed building, or a house inside a conservation area, it is part of the building's character. Colour, curve, the way each tile sits and the pointing beneath all show from the street, and a council officer reads them first.
It is also the part of a roof that tends to fail soonest. It stands highest, meets the wind first and relies on a strip of mortar that weathers faster than the tiles around it. So repair is seldom optional, but it has to suit the age of the building. A plain grey concrete ridge on a handmade clay roof is a mistake that stays visible for decades.
Below we cover matching the old tiles, the mortar question, how a modern fixing goes in without spoiling the look, and where consent enters. It describes what we check on site. Your own building, and its listing if it has one, decide what applies. The wider picture is on our ridge tile repairs page.
Listed, conservation area or National Park: three different cases
These get lumped together, yet they work differently. A listed building is protected one building at a time, for its special architectural or historic interest, and the protection takes in the roof. A house in a conservation area is not protected in that way. The area is, and the council watches over how it looks. Inside the South Downs National Park a different body handles planning, though the Park does not make a house listed.
Locally the picture is patchy. Worthing has 27 conservation areas, and Adur & Worthing Councils also look after areas such as Old Shoreham and Kingston Buci. Castle Goring and Highdown are among the Worthing areas inside the National Park for planning purposes, so there the South Downs National Park Authority, not the borough, is who you ask. Elsewhere on our patch, the quickest route to an answer is a call to the planning team with your address in hand.
Find out before the survey
On the first call we ask about listing and boundaries, since the answer shapes the quote. A listed roof needs a closer study of the existing materials before anything is priced. A conservation-area roof needs a check for a local direction. You can help by finding the listing description, which gives the grade and a short summary, and by telling us whether the address sits inside a Park or conservation boundary.
If you are not sure, say so. Asking the council costs nothing, and it is far cheaper than undoing a repair done in the wrong materials.
Matching the ridge you already have
On a heritage roof the target is a repair nobody notices, and that starts with reading what is already up there. Ridge tiles come in several shapes: half-round, the plain curve; angled, with a sharp apex; and decorative types with a crest, roll top or pierced pattern, seen on villas and terraces built in the late nineteenth century. Each has its own length, width and rise, and a tile from a different range will sit differently along the line even when the colour looks near.
Surface counts as much as shape. A weathered clay tile has a mottled, softened face, and a new machine-made one beside it can look flat for years. We look at the old tiles for maker's marks, work out whether they are plain, glazed or hand-formed, and compare them with current ranges. Where the profile is standard, a close match is often available new. Where it is a one-off pattern, the choices are copies made to order, sound tiles borrowed from a hidden part of the roof, or salvage.
Order of preference
The roof's own sound tiles come first, because nothing matches better than the originals. We lift them carefully, sort cracked from sound, scrape away the old mortar and relay the good ones along the visible run. Salvaged tiles from another building come next, and new tiles chosen for the match come last. A conservation officer may want a sample before work starts, so allow a little time on a listed property.
Whatever the source, the ridge should finish with the line it had before: no new gaps, no ends poking past the gable and no change in height that shows from the road.
Mortar on a historic roof
Mortar does two jobs on a ridge. It beds each tile on the top course, and it closes the open ends where the tiles meet the slope. On an old roof it was usually a soft lime-based mix, which gives a little with the building and lets moisture out. Hard modern cement can crack away from soft old tiles and hold water against a historic timber. The choice of mix is therefore a conservation question as well as a roofing one, and the council or its adviser may have a view on it for a listed building.
The colour of the finished joint matters too. Bright new pointing beside weathered tiles stands out, but the sand and any pigment can be adjusted so that it settles down. Some old roofs also carry a struck or raked finish worth copying, which is why we photograph the existing pointing before anything is disturbed.
Bedding is only half the job
Mortar holds a tile by bond and by weight, and a gale gets under a ridge with real force. Since the 2014 revision of BS 5534, the mortar bed no longer carries the load alone on ridge and hip tiles, which now take a mechanical fixing as well. On a protected building that raises a fair question about adding a fixing without changing the look, and the next section answers it.
Re-bedding in the right mix, with each tile fixed through to the ridge timber, is the usual repair on an old ridge that has simply weathered out.
Adding fixings without spoiling the line
BS 5534 sets out how coverings are fixed, and Marley's guidance points out that working to it is not required by law. The 2018 amendment accepts that for heritage roofs the guidance may not fit, and refers owners to the local planning authority and to conservation specialists. In plain terms the standard is a guide, and on a protected building it is weighed against the need to keep original fabric.
Several approaches keep a fixing quiet. A screw or nail chosen for the exposure can pass through the tile into the ridge timber and be pointed over, so it never shows. A concealed clip can hold the tile to the batten beneath. A dry-fix ridge, made to BS 8612, replaces the bedding for a continuous fixing and ventilated strip, but its visible parts can look wrong on a historic profile, and some designs alter the gap under the tile. We would not propose one on a listed building without agreeing it first.
Why the coast raises the stakes
Our roofs take sea weather, and a loose ridge on a gale-swept house is no small risk. A tile that slides off can land on a path or a neighbour's car. So we do not leave a heritage ridge on mortar alone merely because it looks right. We fix it, then make the fixing as discreet as the building allows.
Roofs near Shoreham airport can call for specialist input from the manufacturer, so we speak to them before choosing a method. Our guide to ridge tiles and coastal wind explains how gusts lift a ridge.
When a ridge repair needs consent
For a listed building, the law says works that alter its special character need authority first, and going ahead without it is an offence. That sounds alarming, yet the Adur & Worthing guide to listed building consent is practical: its text says sensible upkeep and routine repairs call for nothing special, while "repairs not carried in matching materials" is its stated example of work where consent is required.
The South Downs National Park Authority draws the line in similar terms. Upkeep and small repairs that put like back for like, in situ, sit outside listed building consent. Changing historic features, or replacing them wholesale where that alters the building's character, sits inside it. So re-bedding the existing ridge tiles in matching mortar reads as repair. Swapping a historic ridge for another style, or running a dry-fix system along a listed roof, reads more like alteration.
How we handle the question
Legal advice is not ours to give, and the council decides what needs consent. What we can do is describe the work exactly, down to materials and fixings, so the planning team or the Park Authority can answer you plainly. If an application is needed, it takes time, and the repair should wait for the reply unless the ridge is unsafe.
An unsafe ridge is a separate matter. Where tiles are loose and likely to fall, we make the roof safe first by securing or removing what could come down, then carry out the permanent repair once the position is clear. That order protects people below and the building too.
Article 4 directions around Worthing and Shoreham
A conservation area does not by itself stop like-for-like re-roofing from being done without planning permission. An Article 4 direction can. It strips chosen permitted development rights from every property inside a boundary, so whatever the order lists needs a planning application first. Adur & Worthing Councils say that in certain conservation areas they have served directions covering alterations such as replacing roof tiles.
We can name the ones we know. Old Shoreham and Kingston Buci each have a direction, in force since early 2023, that removes the right to alter a roof, coverings included, for a house that fronts a street or footpath, along with the freedom to alter or replace a chimney. Worthing's Warwick Gardens carries a 2001 direction. It targets alterations to a front slope, in shape or in what it is made of, plus any chimney work. Warwick Place has one aimed at roof alterations facing that street itself, and Western Row has a 1979 direction annotated as removing all dwellinghouse rights.
Does a ridge repair count?
It depends on what is done. Re-bedding the same tiles looks like maintenance. Changing the material or form is the kind of change these directions target. We would not guess, so for an address in one of those areas we suggest a quick word with the Adur & Worthing planning team before work starts.
Not every direction touches roofs. Those for Ambrose Place and Cowper Road, for instance, cover hard surfaces and enclosures, not roof work.
Churches and how a heritage ridge job runs
Places of worship follow their own route. Where a Church of England church is still in use, approval runs through its faculty system, and certain other denominations have processes of their own. A closed church, or a place of worship of another faith, needs listed building consent from the local authority instead, and a scheduled monument needs separate consent from the Secretary of State. If you look after a chapel or churchyard building, tell us at the first call which category it falls into, and we will work to the right route. Our page on hip irons also helps where the roof has hips as well as a ridge.
The sequence on every protected roof
We survey the ridge, photograph the tiles, mortar and fixings, and show you what we find. We say which parts can be saved and which need replacing, and describe the match we propose. Next comes the written quote, a single total price, naming the mortar mix and the match proposed. Once the repair is finished we sweep up and carry our rubbish off with us.
On cost, dry ridge cost per metre gives typical national figures, though a heritage job is priced from its own survey. Matching tiles, mortar mix, access and any consent period all move the figure, and that is why a ridge cannot be priced fairly from a photograph alone.
