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Type · PVC dormer

PVC dormer

PVC is the default cladding on most prefab dormers — cheapest to buy, easiest to clean, and good enough for the majority of houses if the profile system is specified honestly.
5 min leestijd·Onafhankelijke informatie

Short answer

A PVC dormer suits standard houses, owners who value low maintenance, and budgets that need to keep the project below €12,000. The single most important question to ask is which PVC profile system the company uses — answers should name a manufacturer, not a generic "plastic".

Why it's popular

  • Lowest purchase price for a finished, insulated dormer.
  • No paint cycles — wipe-down maintenance.
  • Factory production tolerances are tighter than on-site work.
  • Wide range of standard sizes and colours.

Quality levels you actually meet

  • Single-wall PVC: entry level. UV stability and dimensional behaviour highly dependent on supplier. Cheapest, shortest life.
  • Multi-wall PVC profile: co-extruded outer layer with UV stabilisers. The honest mid-market choice.
  • PVC-Trespa hybrid: PVC base with Trespa or aluminium accent panels. Best look and longest life.

Lifespan

Structure 40+ years; cladding 25–35 years if installed with a ventilated cavity and a quality profile. Most failures are at joints and around lead aprons, not in the PVC sheet itself.

Best fit

  • Standard 1970s–2010s houses where the dormer doesn't need to match existing joinery.
  • Owners who plan to sell within 10–15 years.
  • Budgets where €2,000–€4,000 difference vs timber is decisive.

FAQ

FAQ

Veelgestelde vragen

01Is a PVC dormer lower quality than a timber one?
Not automatically. A well-specified PVC dormer with a multi-wall profile, proper ventilation and a documented Rc value will outperform a poorly-built timber dormer. The spec sheet matters more than the material label.
02How long does a PVC dormer last?
Structure 40+ years; cladding 25–35 years if installed with a ventilated cavity. Without ventilation, UV and heat shorten cladding life to 15–20 years.
03Does PVC discolour over time?
Cheap single-wall PVC can chalk and yellow within 10–15 years on sunny elevations. Better profile systems with UV-stabilised co-extruded layers stay close to original colour for 25+ years.
Conclusie
PVC is a defensible default for a standard house. Pin the company down on the profile system, insist on a ventilated cavity, and the headline price stops being a gamble.