Loft Conversion Roofing specialists in Cosham. Coastal specification, 10-year guarantee, free written quotes with no call-out fee.
Cosham's 1930s semis with original concrete plain tiles housing requires careful structural assessment before any loft conversion roofing work. Rafter sizing, ridge beam specification and dormer structural details all depend on the original construction era.
Dormer flat roofs on Cosham loft conversions face Portsea Island coastal microclimate in finished position. We specify GRP flat roof systems on all dormer cheeks and tops as standard. Coastal conditions here make felt an inadequate specification.
Velux roof lights are lower cost and preserve the original roof line. Dormers provide more floor space but require planning permission. We advise on structural and planning implications of both options.
| Service | Cost | Notes |
|---|---|---|
| Velux installation per window | 400-700 | Coastal-grade flashing included |
| Dormer flat roof GRP | 1200-2500 | Full GRP specification |
| Structural rafter works | POA | Assessed on survey |
| Full loft conversion roofing package | 3500-8000 | Structural membrane tiles Velux |
"Nail sickness on our post-war Cosham property — both slopes assessed and re-fixed with stainless. Explained exactly what to watch for."
"Flat roof on our 1970s rear extension — GRP in a day. Matched the upstand height to the existing brickwork exactly."
"1930s chimney repointing — Portsmouth Roofing used lime mortar, explained why OPC cement would cause spalling. Correct decision."
Yes structural rafter works, dormer roofing, Velux installation and tile reinstatement across Cosham. Call 0239 307 1334.
GRP fibreglass as standard. Coastal conditions make felt inadequate.
Velux within permitted development limits typically do not. Dormers usually require planning. We advise on requirements before quoting.
Yes building regulations compliance documentation on completion.
Yes we source appropriate reclaimed materials and advise on planning requirements.
Yes free survey and written quote. Call 0239 307 1334.
Yes. NFRC registered, fully insured, 10-year written guarantee.
Cosham sits at the northern approach to Portsea Island — slightly inland from the harbour but within the island's salt-influenced microclimate. Frost incidence is similar to Portsmouth generally but the 1930s semi concentration creates a specific repair profile across the suburb.
Cosham and adjacent Drayton are dominated by 1930s semi-detached properties — original concrete plain tiles now 85 to 90 years old and showing advanced surface aggregate erosion. Many properties are at or past the repair vs replace decision point.
Cosham 1930s semi loft conversions are common. The structural configuration of this era is well-understood — standard rafter and ridge arrangements that accommodate both Velux and dormer options. Every job we carry out in Cosham is specified for these specific conditions — not a generic Portsmouth-wide approach.
No call-out fees. No obligation. Loft Conversion Roofing specialists in Cosham.
0239 307 1334