Dormers are the most maintenance-intensive element of many Chichester roofs. The junction between the dormer cheeks, the flat or pitched dormer roof, and the main roof covering creates multiple flashings and junctions — each a potential water entry point. We carry out dormer repairs, leadwork, flat dormer top replacement and full dormer rebuilds across Chichester.
Dormer roofing in Chichester covers cheek flashings (£400–£900), flat dormer tops in GRP (£500–£1,200) and full leadwork. Dormers have more flashing junctions than any other roof element. Free survey. Call 01243 278085. Covering conservation and standard properties across Chichester and West Sussex.
Dormers create more flashing junctions per square metre of roof than any other roofing element. The cheek flashings, the front apron, the sides of the flat top or the pitched dormer covering, and the junction with the main roof — all of these require correctly specified and installed leadwork that moves with the building and stays watertight through decades of thermal cycling. When any of these fail, water finds its way in at the most complex junction on the roof.
The cheek flashings — the lead strips running down each side of the dormer where it meets the main roof — are the most common dormer failure point across Chichester properties. They are subject to both the thermal movement of the dormer structure and the differential movement between the dormer and the main roof. On Victorian and Edwardian properties in St Pancras, Whyke and Stockbridge, original cheek flashings are often 80 or more years old and have been patched multiple times. Full replacement in Code 4 lead with correctly formed and fixed steps gives a lifespan of 50 to 80 years.
Flat-topped dormers have two appropriate covering options in Chichester: lead or GRP fibreglass. Lead is the traditional and required material for conservation area and listed building properties — it is long-lasting, repairable and appropriate to the character of the building. GRP is an excellent alternative for standard residential properties outside conservation areas: it provides a seamless, low-maintenance surface with a 25 to 40 year design life and handles the frequent thermal cycling that flat dormers experience better than felt. We do not specify felt for flat dormer tops — its lifespan in this application is typically 8 to 12 years before replacement is needed again.
Free survey — no call-out fee — Chichester & West Sussex
📞 01243 278085Many Chichester dormers have tile-hung or timber-clad cheeks that deteriorate independently of the flashing system. Tile-hung dormer cheeks on Victorian and Edwardian properties often have original clay plain tiles that have slipped or broken over time. Timber-clad dormers develop rot at the base where water drains off the flat top. We carry out tile rehang, timber replacement and render repairs on dormer cheeks as part of full dormer maintenance, often combined with flashing replacement to avoid scaffolding the same area twice.
Adding or substantially altering a dormer on a property in Chichester's conservation areas typically requires Conservation Area Consent or, for listed buildings, Listed Building Consent. Even replacing like-for-like on a listed building requires consent if the work is more than routine maintenance. Repair and replacement of existing dormers in appropriate materials — lead, clay tile, natural slate — is generally permitted. We advise on the consent position before any dormer work starts on properties in designated areas.
"Dormer had leaked at the cheek junction for years. They replaced both side flashings properly in Code 4 lead with stepped fixings. Completely dry since."
"Flat dormer top replaced with GRP. No more felt patching every few years. Should have done it a decade ago."
"Listed property in the city centre. They understood exactly what specification was needed and didn't suggest any shortcuts. Good craftsmen."
The most common causes are: failed cheek flashings (the lead strips down the sides of the dormer), an open or deteriorated front apron flashing, a failed flat dormer top, or movement at the junction between the dormer and the main roof. Dormer leaks are often complex to diagnose because water can track some distance from the entry point before appearing internally. A close-range inspection from scaffold or a cherry picker is usually needed for an accurate diagnosis.
Cheek flashing replacement on a standard dormer costs £400 to £900 per side. A full leadwork package — both cheeks, front apron and back gutter — runs £1,200 to £2,000 on a typical Chichester dormer. GRP flat dormer top replacement is £500 to £1,200 depending on size. Written quotes after a free survey.
For conservation area and listed building properties: lead. For standard residential properties: GRP is our recommendation — it provides a longer, lower-maintenance service life than lead on flat dormers and handles thermal cycling well. We do not recommend felt as a long-term solution for flat dormer tops.
Like-for-like repair and maintenance of existing dormers is generally permitted development. For listed buildings and conservation area properties, any work beyond routine maintenance may require consent. Adding or enlarging a dormer almost always requires consent. We advise on your specific position at the survey.
Correctly specified Code 4 lead cheek flashings and aprons should last 50 to 80 years. In Chichester's coastal and harbour-adjacent locations, patination oil is specified to extend the life of lead in salt air. Original Victorian lead that has not been touched is often 100+ years old and still sound — the failure mode is usually the mechanical fixings, not the lead itself.
Yes — and we recommend it. If a dormer is being scaffolded for flashing replacement, carrying out any other roof work that requires access at the same time is significantly more cost-effective than separate scaffold visits. We advise on what else is worth addressing while the access is in place.
Yes. We carry out regular dormer work on listed buildings and conservation area properties in the city centre, The Pallants, St Pancras and Whyke. We understand the material requirements, consent implications and the standard of workmanship that these buildings deserve.
Dormer work provides the clearest argument for a whole-roof assessment rather than a targeted repair. Scaffold erected for a cheek flashing replacement is scaffold that also provides access to the main roof, the ridge, the adjacent flashings and the guttering. Carrying out a comprehensive condition check while the access is in place — and addressing any additional issues found at the same visit — costs a fraction of erecting scaffold a second time for a separate job. We include a whole-roof assessment in every dormer survey and, if the scaffold is already specified, present the full picture of what else can be addressed cost-effectively while the access is available. This is how we manage roofing expenditure on complex Chichester properties — by making the most of the access each visit requires rather than generating multiple scaffold visits for issues that could have been addressed together.
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