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Dormer window cost Netherlands 2026 — dakkapel price and permit
How much does a dormer window cost in the Netherlands in 2026? Price by size and material, permit rules for front and rear dormers and return on investment.
Quick answer
A dormer window (dakkapel) costs € 8,000–€ 22,000 in the Netherlands in 2026 depending on width and material. Small PVC dormer (2 m wide): € 8,000–€ 13,000. Wider timber dormer (4–5 m): € 14,000–€ 24,000. A permit is required for front-facing dormers.
Cost by dormer type
| Type | Width | Cost incl. installation | |---|---|---| | PVC dormer (standard) | 2.0–2.5 m | € 8,000–€ 13,000 | | PVC dormer (wide) | 3.0–4.0 m | € 10,000–€ 17,000 | | Timber dormer (meranti/douglas) | 2.5–3.5 m | € 12,000–€ 19,000 | | Timber dormer (wide) | 4.0–5.0 m | € 15,000–€ 25,000 | | Aluminium dormer | 2.5–4.0 m | € 11,000–€ 20,000 | | Prefab dormer (factory + installation) | 2.0–3.5 m | € 7,500–€ 14,000 |
Detailed cost breakdown (PVC dormer 2.5 m)
| Item | Cost | |---|---| | Dormer structure (prefab or custom) | € 4,000–€ 8,000 | | Installation + scaffolding | € 1,500–€ 3,500 | | Roofer (roof repair around dormer) | € 800–€ 2,000 | | Electrics and heating connection | € 500–€ 1,500 | | Interior finishing | € 600–€ 1,500 | | Architect + permit (front dormer) | € 800–€ 2,500 | | Total | € 8,200–€ 19,000 |
Permit rules 2026
Permit-free (rear dormer, Bbl Art. 2.3):
- Dormer on the rear roof slope
- Max. width: 50% of the roof face (subject to limits)
- Max. height above roof slope: 1.75 m
- Set back from roof edge: ≥ 0.5 m
- Not visible from the road when on a side slope
Omgevingsvergunning required:
- Front-facing dormer (visible from public road)
- Dormer that exceeds the Bbl size limits
- Listed building or protected townscape: always a permit
When a permit is required: scaled drawings, material description and welstand assessment.
Dormer vs. roof window: which one?
| Option | Advantage | Cost | |---|---|---| | Roof window (Velux/Fakro) | Cheap, permit-free | € 1,200–€ 3,500 | | Dormer window (dakkapel) | More floor space, standing height | € 8,000–€ 22,000 |
A dormer adds 1.5–2 m² of usable floor space with full standing height — a roof window does not.
Property value increase
A dormer that makes a loft bedroom fully usable typically adds € 10,000–€ 25,000 to property value. Two dormers converting the loft to a bedroom: € 20,000–€ 50,000.
Conclusion
A dormer window costs € 8,000–€ 22,000 in the Netherlands in 2026. Rear dormers are permit-free; front dormers need an omgevingsvergunning. Value uplift typically outweighs installation cost within 5–10 years.
archi.sulerr.com handles the design, drawings and omgevingsvergunning for front-facing dormers — including welstand advice and Bbl dimension compliance check.