Renovating Your Home in Poland: Permit, Zgłoszenie or Nothing?
Short answer: Most interior renovation in Poland - work that does not touch external walls or structural elements - needs neither a permit nor a zgłoszenie. Altering a house's external walls or structure, gas installation work and grates on apartment blocks need a zgłoszenie; work can start 21 days after filing if unopposed.
The default rule, and its two exceptions
Poland's Building Law (ustawa - Prawo budowlane) starts from a simple principle: construction work may begin only on the basis of a building permit decision. The exceptions are written into Article 29 of the Act, and they matter to anyone planning work on a flat or house. Some buildings and works need only a "zgłoszenie" - a notification filed with the local construction authority - and a long list of everyday renovation work needs neither a permit nor a notification.
The details below follow the consolidated text of the Act, Dz.U. 2026 poz. 524, and the guidance published by the Chief Building Supervision Authority (GUNB), as of October 2026. One caveat the GUNB itself repeats: if you are unsure which category your planned work falls into, ask the local architectural and construction administration authority - the starosta (district head) or, for some cases, the voivode - before you start.
Work that needs neither a permit nor a zgłoszenie
Under Article 29 section 4 of the Building Law, none of the following requires any paperwork with the construction authority:
- Interior alterations to buildings - including flats in apartment blocks and single-family houses - as long as the work does not touch external walls or structural elements. Moving a non-structural partition, redoing a bathroom, replacing floors or rewiring a flat falls here.
- Renovations of building objects, with two carve-outs listed in the next section (external partitions and structural elements of buildings whose construction required a permit, and structures whose construction required a permit).
- External insulation (docieplenie) of buildings up to 12 metres high.
- Heat pumps, free-standing solar collectors, photovoltaic installations up to 150 kW and electricity storage up to 30 kWh. For PV above 6.5 kW the design must additionally be agreed with a fire-safety expert and the State Fire Service notified when installation finishes.
- Installations inside and outside a building in use - except gas installations, which do need a zgłoszenie.
- Window grates on buildings other than multi-family residential, public-utility and collective-residence buildings.
In practical terms: a like-for-like kitchen or bathroom refit, painting, new windows in existing openings that do not alter the structure, and a heat pump for a detached house are all paperwork-free under the current Act.
Work that needs a zgłoszenie
A zgłoszenie is a notification, not an application - the authority does not approve it, it can only object. Under Article 29 sections 1 and 3, the renovation-relevant cases include:
- Altering external walls or structural elements of a single-family house, provided the work does not extend the building's impact beyond its own plot. Cutting a new window opening in an external wall or removing a load-bearing wall belongs here.
- Renovating external partitions or structural elements of buildings whose construction required a building permit.
- External insulation of buildings over 12 metres and up to 25 metres high - relevant to taller tenements and small apartment blocks.
- Installing gas installations inside or outside a building in use.
- Installing window grates on multi-family residential, public-utility and collective-residence buildings.
- Heritage note: work on a site entered in the register of monuments requires a zgłoszenie, while work on a building that is itself in the register requires a full permit.
How a zgłoszenie works in practice
The notification goes to the locally competent architectural and construction administration authority - for most home projects the starosta's office. In it you state the type, scope and manner of the planned work and the start date, and you attach, as a rule, a declaration that you hold the right to use the property for construction purposes, plus appropriate sketches or drawings. Certain listed investments also need design documentation prepared by a licensed designer.
Timing is governed by Article 30 of the Act: you may start work if, within 21 days of the notification being delivered, the authority has not raised an objection by decision, and provided you start no later than three years after the start date you declared. Paperwork can also be filed electronically through the government's e-Budownictwo application.
When you still need a full building permit
Everything outside the Article 29 lists defaults to a permit: raising or extending a building, changing its use, adding a storey, and any work whose impact reaches beyond your plot in ways the zgłoszenie cases do not cover. The permit application is a heavier file - a plot development design and an architectural design (in three paper copies or electronic form), a declaration of the right to use the property, and any sector-specific opinions or decisions. Work on buildings entered in the register of monuments always requires a permit decision.
If you skip the paperwork
Building supervision treats work carried out without a required permit or zgłoszenie as a construction offence (samowola budowlana). Under the current Act, when an inspection confirms the irregularity, the penalty is calculated as a statutory formula: a base rate of 500 zł multiplied by a building-category coefficient and a building-size coefficient set out in the annex to the Act. The supervision authority is obliged to inspect within 21 days of receiving the summons to legalise, and the investor must attend. Separate procedures exist for legalising work done without a permit and without a notification - but they cost more than filing on time, and for some categories demolition remains the fallback.
* Photos: Kamil Czaiński and Mariochom, Wikimedia Commons, CC BY-SA 4.0
Frequently asked questions
Do I need a permit to renovate my kitchen or bathroom in Poland?
No. Interior work in a flat or house that does not affect external walls or structural elements needs neither a building permit nor a zgłoszenie under Article 29 section 4 of the Building Law. Gas installation work is the exception - it requires a zgłoszenie.
Do I need paperwork to insulate my house?
For a building up to 12 metres high, external insulation needs neither a permit nor a zgłoszenie. For buildings over 12 metres and up to 25 metres, a zgłoszenie is required before work starts.
How soon can I start after filing a zgłoszenie?
Once 21 days have passed since the authority received your notification without issuing an objection, you may begin - and no later than three years after the start date you declared in the notification.
What is the penalty for renovating without a required notification?
If an inspection confirms work that required a permit or zgłoszenie was done without one, the fine is a statutory base of 500 zł multiplied by coefficients for the building's category and size, as set in the annex to the Building Law.
