Choosing a dormer company:
what should you look out for?
A dormer is a structural change to your roof. The company you pick largely decides the quality, insulation, finish and lifespan. This site gives you clear, neutral information so you can compare companies fairly — no quotes, no sales, no pressure.
Vier vuistregels
- Vergelijk minimaal drie bedrijven op meer dan alleen prijs.
- Beoordeel materiaal, isolatie, montage en garantie afzonderlijk.
- Controleer altijd vergunningseisen bij uw eigen gemeente.
- Een lage prijs zonder specificatie is een waarschuwingssignaal.
A low price tells you very little on its own.
Quotes for what looks like the same dormer can differ by thousands of euros. Those differences almost always have a reason: material quality, the insulation package, frames, glazing, interior and exterior finish, permit handling, warranty terms, transport and the complexity of your roof.
Reviews alone are not enough. Reading a quote properly is a skill of its own. This site walks you through the things to check, step by step, with checklists, comparisons and warnings.
The 10 most important checks
Ten main topics, more than a hundred articles.
Choosing a dormer company
The checks that let you judge a dormer company fairly.
Cost and price differences
What really drives the price, from materials to crane work.
Types of dormers
Prefab, traditional, shell-only and which one fits where.
Materials
PVC, timber, composite cladding, polyester, EPDM and lead.
Insulation and energy
R-value, thermal bridges, condensation and energy label.
Permits and rules
Front, rear, aesthetics committee and council requirements.
Construction and install
Hoisting, roof opening, waterproofing and connections.
Failure points and risks
The mistakes that most often lead to leaks or complaints.
Warranty and reliability
Reading reviews, certifications and the small print.
Checklists
Step-by-step checks for quote, permit and handover.
Materials at a glance
| Material | Maintenance | Lifespan | Look | Watch out for |
|---|---|---|---|---|
| PVC | Very low | Long | Sleek, modern | Quality varies a lot per supplier |
| Timber | Periodic painting | Long with upkeep | Traditional, warm | Maintenance is a must |
| Composite cladding | Low | Long | Wood look, sleek | Finish quality depends on the fitter |
| High-pressure laminate | Low | Very long | Sleek, modern | Higher material cost |
| Polyester (single shell) | Low | Long | Smooth, one piece | Repairs tend to be visible |
Common mistakes when choosing
Quick checklist before you compare
Before you put companies side by side
- 01Ask for at least three quotes with the same specs.
- 02Check that materials, sizes and insulation are named clearly.
- 03Ask whether the company has its own production and own fitters.
- 04Ask who applies for the permit and who is responsible.
- 05Read the warranty terms for structure, waterproofing and finish.
- 06Check reviews on more than one independent platform.
- 07Ask about planning, lead time and install duration.
- 08Ask what happens with extra work or unexpected issues.
- 09Ask how handover and aftercare are arranged.
How to read a dormer quote line by line
Which items must be spelled out clearly and which phrases are vague.
Lees verderWhy is one dormer company more expensive than another?
The items that explain a real price gap, and which differences are not a quality signal.
Lees verderPermits, aesthetics rules and neighbour objections
What can differ per council and roof side, and how to check it up front.
Lees verder