Technical condition and energy

Renovation (rekonstrukce)

In Czech: Rekonstrukce

Renovation (rekonstrukce) means repairing or modernising a flat or house by renewing parts of it, such as wiring, plumbing, the bathroom, windows or roof. In Czech listings the word can cover anything from new floors to a full rebuild.

Also called: refurbishment, modernisation, po rekonstrukci, před rekonstrukcí, původní stav

What it means

In Czech property listings the word rekonstrukce is used very loosely. Sometimes it means a new kitchen and fresh paint, sometimes the replacement of all water, waste and electrical lines, new windows and a changed layout. There is no binding definition of a partial versus a complete renovation.

Listings also use the opposite terms: původní stav (original condition) or před rekonstrukcí (in need of renovation). For a buyer, a list of what was actually done, when and by whom matters far more than the word in the headline.

How it works in the Czech Republic

Work that touches load-bearing structures, shared building services or the look of the building may need to go through the building office (stavební úřad), and in a block of flats also through the owners' association (SVJ) or cooperative. What a particular change required varies from case to case, so check with the building office or a specialist.

Renovation can affect documents. Under Act No. 406/2000 Sb., the energy performance certificate (PENB) ends before its ten years are up after a major change to the building or a change of the heating, cooling or hot-water system. If a conversion changed the purpose of a space, say from non-residential premises to a flat, remember that a building which needs occupancy approval may be used only for the purpose stated in its kolaudační rozhodnutí.

After a major renovation the seller should be able to show invoices, warranties, inspection reports for electricity and gas and, ideally, photos of pipes and cables before they were covered. Without them the scope of the work is just a claim in the advert.

Practical example

For example, an advert promises a flat after a complete renovation. At the viewing you see new floors and a new bathroom, but the fuse box still has old screw-in fuses and aluminium wiring. Ask which lines were replaced and request the electrical inspection report. If the seller cannot document anything, treat the renovation as cosmetic and negotiate accordingly.

What to watch out for

  • Ask for a written list of the work done, with years and contractors.
  • Ask separately about electrical, water, waste and gas lines, which you cannot see once covered.
  • Check that changes to load-bearing walls or the layout had any permission they needed.
  • If the heating was changed, check that the PENB was issued after the renovation.
  • In a block of flats, ask about planned repairs to common parts that you will contribute to.

Frequently asked questions

What does před rekonstrukcí mean?

That the property is in original or worn condition and the buyer is expected to renovate it. Get the necessary work estimated before you make an offer.

Does a renovation need a permit?

It depends on the scope. Replacing a kitchen usually does not involve the building office, while work on load-bearing structures or a change of use may; check with the office.

Can a renovation change the energy class?

Yes. Insulation or a new heat source shows up only in a new certificate, and a change of heating also ends the validity of the existing PENB.

  • Structural stability (statika budovy)Structural stability (statika budovy) describes how a building's load-bearing parts, its foundations, walls, floors and roof frame, carry loads. Structural defects show up as cracks or sagging ceilings and are assessed by a structural engineer.
  • Electrical inspection (revize elektroinstalace)An electrical inspection (revize elektroinstalace) is a professional check of the wiring and electrical equipment in a flat or house. It ends with an inspection report (revizní zpráva) describing the installation and any defects found.
  • Waterproofing (hydroizolace)Waterproofing (hydroizolace) is a layer or treatment that stops water and ground moisture getting into walls, floors, cellars and the roof. Where it is missing or worn out, you get damp, mould and crumbling plaster.
  • Energy performance certificate (PENB)PENB (průkaz energetické náročnosti budovy) is the Czech energy performance certificate. It rates how much energy a building or flat needs and places it in a class from A (exceptionally efficient) to G (exceptionally inefficient).
  • Occupancy approval (kolaudace)Occupancy approval (kolaudace) is the procedure in which the building office allows a finished building to be used. Where Building Act No. 283/2021 Sb. requires it, it ends with an occupancy decision, without which the building may not be used.
  • Latent defects (skryté vady)Latent defects (skryté vady) are faults in a property that could not normally be spotted at the viewing or handover, such as damp in the walls or damaged pipes. For buildings, the law links them to a five-year period from acquisition.

Sources

Laws and official pages this text is based on (in Czech).

This text is for information only and has not yet been checked by a legal or financial expert. It is not legal, tax or financial advice. Verify important details in the listed sources or with a professional.

Updated 25 October 2026

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