Which building works are worth doing before unit-by-unit sale

Why renovation calculations differ for unit-by-unit sales

When you sell unit by unit, you're not selling a single building to one investor, but many flats to individual buyers, and they assess the building's condition more critically.

An investor buying the whole building factors repairs into the price. A buyer of a single flat wants no surprises: a building with a leaking roof, damp walls or outdated vertical risers (shared water and heating pipes—стояки in Czech terminology) sells slowly and at a steeper discount. The value difference between a lump sale and unit-by-unit sale is typically 20–40%, but the precise figure depends on the particular building and will be determined by a feasibility study.

The basic rule therefore is: invest where an upgrade removes a reason a buyer might hesitate or ask for a discount, and where doing it once for the whole building is cheaper than repeating it for each flat.

What to do immediately: upgrades that remove sales obstacles

Start by addressing defects that threaten the building as a whole or prevent sale itself.

• Structural integrity and roof: leaks and failures in load-bearing elements undermine all buyers' confidence and make flat financing harder.
• Dampness and emergency conditions: unresolved dampness is reflected in every unit's price.
• Vertical risers (shared water, heating and gas pipes), common electrics and gas: these are communal parts that individual buyers won't repair themselves, and their condition later becomes the responsibility of the building's owners' association (společenství vlastníků—a legal entity under Czech law).
• Separate metering and supply division: so each flat can operate independently, each needs separate utility meters and water supply.
• Documentation and legalization: precise records of actual condition and verification that layouts match the building permit. Procedures and obligations are set out in the Building Act No. 283/2021 Coll.

These works make the most sense because they're about saleability, not appearance. Their payback is judged by how much a buyer would discount the price for the defect, not as a percentage of costs.

What can wait or depends on calculations

Upgrades that boost comfort and appearance are only worthwhile if calculations support them.

• Façade and entrance areas: first impressions affect buyer interest, but tailor the scope to the building's condition and target market.
• Stairs, lighting, mailboxes, intercoms: minor upgrades with good value for money, useful as additions.
• Lift (elevator), loft conversion, balconies: boost potential but are costly and often need permits under the Building Act No. 283/2021 Coll. and third-party consent. Decide these based on potential calculations.
• Windows and common area insulation: worthwhile if technically necessary or if buyers expect it.

Don't apply fixed rules here. These pay off only if the expected income from flats exceeds costs and delay risk.

What flat buyers can do

It's usually better to leave flat interiors to buyers, who'll adapt them to their own taste and budget.

• Floors, plaster, paint, doors,
• Kitchens and fixtures,
• Bathrooms and in-flat plumbing, unless visibly in poor condition,
• Changes to flat layout within regulations and with the owners' association's consent.

The exception is a flat in such poor condition it can't be shown or financed without basic work. Basic tidying up without design interventions may suffice. Buyers often won't pay premium prices for pre-fitted interiors, so over-investment risk is highest with flat finishes.

Priority overview and assessing payback

Judge each upgrade's payback by whether it removes a sales barrier, not by a universal percentage.

The boundaries between categories aren't fixed. A building in good technical condition might consider appearance upgrades sooner; one with defects must start from basics. Only a detailed Audit and Plan (a paid feasibility study delivered within 6 weeks) will give you the real picture.

How investments fit into the transformation process

Building works should not start until numbers are confirmed in the legal and permit phases.

The project goes through three gates: legal, permit and sales. You only move to the next phase with confirmed figures. So renovation follows legal status verification and permits, otherwise you risk spending on upgrades you later can't use. The full process is explained on our How it Works page.

Also important is the legal definition of flats. Under the Civil Code No. 89/2012 Coll., ownership of individual flats is established by the owner's declaration (§ 1166) and ownership transfer happens only by registration in the Czech Land Registry (Katastr nemovitostí) under the Land Registry Act No. 256/2013 Coll. Building works should align with these steps in time and technically.

What to do now

First clarify the building's condition, only then budget for upgrades.

1. Gather the Czech Land Registry extract, building documentation, inspections and any specialist reports.
2. List known defects and emergencies in common areas.
3. Check flat occupancy rates and rental contract terms.
4. Try a rough calculation with our Potential Calculator.
5. Submit details via the form below the article. You'll get a non-binding assessment or building review this way, with no pressure to decide.

For tax implications of the sale (for example holding period rules or owner-occupancy use), check with the Tax Administration or a tax adviser; the Income Tax Act No. 586/1992 Coll. applies.