What is a heritage reserve and what does it mean for you
A heritage reserve is an area placed under special protection by the state through the National Heritage Institute. Almost all of Prague's old quarters, Staré Město, Josefov, Malá Strana, Hradčany, are part of the Prague Heritage Reserve, which is also on the UNESCO World Heritage List.
What this means in practice:
- You cannot build, reconstruct or change the exterior appearance of a house without a binding opinion from the National Heritage Institute (NPÚ).
- Every renovation project must include an expert assessment arranged by the designer, costing between 10 and 30 thousand Kč depending on the scope.
- Supervision is exercised not only by the National Heritage Institute but also by the heritage protection department of the Prague City Hall and the building authority of Prague 1.
- Penalties for unauthorised interventions can reach hundreds of thousands of Kč, and in extreme cases, an order to restore the building to its original state may be issued.
Process: how renovations are designed in heritage zones
Phase 1: Conceptual study (1-2 weeks)
For example, you have original sash windows and wish to restore them completely. You call an architect experienced with heritage buildings, who will draw up how the restored windows will look, what materials they will be made of, and what hardware they will feature.
Phase 2: Consultation with NPÚ (2-4 weeks)
Submit the study to the NPÚ officer before filing your request for a binding opinion. This will save you several rounds of comments: the officer will immediately tell you what is feasible and what is not.
Phase 3: Binding opinion (4-8 weeks)
Official application to the Heritage Protection Department of the Prague City Hall, accompanied by project documentation and the opinion of the National Heritage Institute. The deadline is 30 days; in practice, 6-8 weeks.
Phase 4: Building permit or notification (4-8 weeks)
Depending on the scope of the renovation. For window replacement in a historically valuable façade, building permission is usually required.
Phase 5: Implementation under NPÚ supervision
During construction, the officer may carry out inspections. All deviations from the approved project must be re-approved.
Common mistakes and how to avoid them
Mistake 1: Carrying out work without a project and a utility network statement.
The owner thinks: "I'll swap the window for a plastic one; no one will notice." In a heritage conservation area, someone always notices, neighbours, a passing heritage inspector, or photos on Google Street View. This is followed by a fine and an order to restore the original state at the owner's own expense.
Mistake 2: Starting without a preliminary consultation.
Submitting a project worth 200 thousand Kč that the NPÚ will reject is an expensive mistake. Always start with an informal consultation with the officer.
Mistake 3: Hiring a designer without experience in heritage buildings.
A standard designer will propose a modern solution that the National Heritage Institute will not accept. Look for designers with references from Prague 1.
Mistake 4: Underestimating the time buffer.
From the first sketch to the start of construction, allow at least 4-6 months. For more complex interventions, a year is not uncommon.
Which materials are accepted in a heritage conservation area
Windows
They must be made of wood with sash or other historically documented glazing bars. PVC and aluminium are prohibited on street-facing façades. Courtyard façades have a more lenient regime, but even there the National Heritage Institute prefers wood.
Facade
Lime plasters and paints matching historical samples (usually muted ochre, grey, red tones). Polystyrene external wall insulation is practically excluded in heritage zones; the solution lies in internal insulation or remedial plasters.
Roof
Baked tiles in the original shape and colour. Sheet metal only where it was historically present: typically on turrets, cornices and around dormers.
Doors and gates
Wooden, with historic metalwork. Original doors are restored wherever possible, not replaced.
Indoor units
Staircases, stucco work and paintings, if they are of historical value, they must be restored by a specialist company.
How to deal with the National Heritage Institute and the building authority
Tip 1: Ask the National Heritage Institute in advance.
You do not need to wait for a completed project. NPÚ officials are actually accommodating if you engage with them before spending money on unnecessary documentation.
Tip 2: Hire a property manager with experience in heritage buildings.
At Heritum, we work exclusively with historic buildings and are on first-name terms with the National Heritage Institute representatives. This saves you months of negotiations.
Tip 3: Document the existing condition.
Before you start any demolition work, take detailed photographic documentation. This will facilitate any future discussions regarding what was and was not present on the property.
Tip 4: Respect deadlines, but do not hesitate to follow up.
The statutory deadline for issuing a binding statement is 30 days. After 45 days, it is appropriate to make a polite telephone reminder. After 60 days, send a written request for urgent action.
Long-term plan for a historic house
When you own a rental building from 1880, you must expect that maintenance will not be cheap and cannot be postponed. Our recommendation for a twenty-year horizon:
- Year 1-2: Building and technical survey, building passport, energy performance audit.
- Year 3-5: Window renewal in two stages (street façade, courtyard façade).
- Year 6-8: Roof repair, sheet metal components and chimneys.
- Year 9-12: Facade: remediation, new render, colour matching historical sample.
- Year 13-15: Internal distribution systems: water, sewage, electrical installations by stages.
- Year 16-20: Restoration of common areas: stairwells, plasterwork, entrance hall.
The plan allows multi-million investments to be spread across manageable annual instalments and keeps the house in good condition for generations.
Frequently Asked Questions
Does the new window have to be exactly the same as the original one?
Yes, provided the historical appearance is documented. Dimensions, division, profiling, hardware and colour must match the original. The glass may be modern (insulating double glazing in a sash), but the external appearance must remain historical.
What if the designer does not know what is correct?
Ask the administrator for a recommendation of a designer with experience in NPÚ. In Prague 1 there are several studios that have specialised in this area for years and know the specific officers.
How long do I have to wait for a statement from the National Heritage Institute?
The statutory deadline is 30 days; in practice, it takes 4-8 weeks. For complex cases, even longer. Plan with sufficient buffer time.