When is your dormer permit-free
A dormer is allowed without an environment permit under strict conditions. Not permit-free means 'not allowed'. Only on rear or non-publicly-visible side roofs, on a dwelling or houseboat, and only if seven concrete conditions are met. This page covers all conditions including exceptions most sites miss.
- Legal basis
- Annex II, art. 4 Bor (continues under Ow)
- Max height
- 1.75 m from roof surface
- Min distance to sides
- 0.5 m
- Min distance to ridge/eaves
- 0.5 m
- Only on
- Rear or non-public side roof
The seven permit-free conditions
1) On a rear roof or non-publicly-facing side roof. 2) Compliant with aesthetics rules or outside aesthetics zone. 3) Not a listed building. 4) Not in a protected city or village view. 5) Max 1.75 m tall measured from the roof.
6) Min 0.5 m from sides (roof edges). 7) Min 0.5 m below the ridge and 0.5 m above the eaves. All seven cumulative — meet six but not the seventh and a permit is mandatory.
Exceptions people miss
A 'rear roof' isn't always physically the back of your house in law. On corner houses or with unusual lot orientation a 'rear roof' can legally be a front facade when it faces publicly accessible space (street, square, public greenery). Check via the omgevingsloket.
Also: apparently permit-free doesn't mean notification-free. Some municipalities still require a demolition or building notification; omission can trigger a penalty up to €2,500.
Check before you start
Use omgevingsloket.nl or call the Building department with your address and intended size. Keep the output report. On future sale a buyer may request the record.
An undocumented 'permit-free' dormer is a problem at sale time: buyer or notary asks for proof, and without it the sale may delay or cost a few thousand euros in price reduction.
Building Code still applies
Permit-free only waives the permit requirement; the substantive rules (Besluit bouwwerken leefomgeving) still apply in full. Insulation R ≥ 4.7, glass HR++ (U ≤ 1.2), 30-min fire resistance to neighbours, load 1.5 kN/m².
As client you're fully responsible. Ask your contractor for a Bbl conformity declaration; without it you stand alone for the costs of complaints or sale issues.
FAQ
- Is permit-free the same as regulation-free?
- No. The Building Code (structure, insulation, fire safety) still applies. You're responsible for compliance.
- Can permit-free be challenged later?
- Yes, at sale or in neighbour disputes. A written municipal check (in advance) or independent building report protects you.
- Must I inform neighbours when permit-free?
- Not legally required but strongly recommended. Advance notice prevents 90% of complaints and lets you incorporate wishes before build.
- What if the area becomes a protected view later?
- A new designation doesn't apply retroactively to existing dormers. New extensions/modifications afterwards do fall under the new rules.
- Can a second dormer also be permit-free?
- Yes, if together they cover no more than 50% of the roof slope and each separately meets the seven rules. Rarely feasible in practice due to 0.5 m distance rules.