Getting into and insulating those roofs is a specific skill; Cosham and Drayton on the mainland bring more conventional semis and bungalows.
Portsmouth's housing and what it means for insulation
Portsea Island is dense Victorian terrace housing — Southsea, Fratton, North End, Copnor — much of it with shallow rafters, flat-roofed rear additions and no loft access. Cosham, Drayton and Farlington on the mainland add inter-war semis and bungalows; Havant and Waterlooville bring post-war stock.
Typical Portsmouth enquiries
- Terrace loft conversions in Southsea and North End
- Flat-roof rear-addition insulation
- Inter-war semi and bungalow lofts in Cosham and Drayton
- Loft floor upgrades in Havant and Waterlooville
Qualitative pattern from Portsmouth's housing stock; replaced with aggregated, anonymised Portsmouth enquiry data as it builds.
Older Portsmouth terraces: shallow rafters and back additions
Portsea Island terraces often have no loft hatch at all and a flat-roofed rear addition, so access and the flat-roof junction are the first two questions on any Southsea or North End survey.
Older roofs can have significantly less usable insulation depth than modern constructions. Rafter dimensions, underlay type, ventilation and any rear or addition roof must therefore be checked at the property before a multifoil or hybrid build-up is specified. Where depth is limited, the usual investigation is multifoil under the rafters with battens forming the room-side air space; where a target U-value applies, PIR between the rafters is added. The party-wall junction and any existing damp staining decide whether the job is straightforward.
Coverage around Portsmouth
Assessment and installation are allocated by postcode and project type across Portsmouth and these surrounding areas:
We also cover Southampton, Brighton, Milton Keynes and the rest of the South East.
How it works, briefly
Postcode → property questions → assessment where a physical inspection is needed → recommendation → fixed quote → installation. Every step runs to the InsulationMatch installation standard; the installing company is named on the quote. Multifoil itself is explained in the multifoil guide, and what moves a price in the cost guide. Local ranges are published here only once genuine Portsmouth quotes exist.
Local projects
Documented Portsmouth projects are added to the project library as they complete. Until then the library's typical project scenarios show how the housing above is assessed.