Building potential · 25 June 2026 · 10 min read

Prague apartment buildings: lofts, extra floors and change of use

Loft of an apartment building with a timber roof structure

“There is room for two duplex flats in the loft.” We hear this about almost every building. Sometimes it is true and adds millions to the price. In other cases, it is an idea no investor will pay for because it cannot secure permission or be built at a reasonable cost.

How investors value potential

Investors do not pay for completed flats, but for the likelihood of being able to build them. They therefore value potential as the value of the completed flats less costs, time, planning and approval risk, and profit. The greater the uncertainty, the larger the discount. For an unassessed loft, the value of that potential may be close to zero.

Owners who assess the potential in advance turn uncertainty into certainty, and that has a value.

Five decisive questions

Heritage protection: is the building a listed cultural monument, or is it within the Prague Heritage Reservation or a conservation zone? A binding opinion from the heritage authority will determine what alterations are possible to the roof and street-facing façade.
Planning and building regulations: the Prague Building Regulations and the land-use plan determine building heights, conditions for adding storeys and parking requirements.
Structural capacity: can the existing structure support an additional storey or a residential loft conversion? Without a structural engineer’s report, any estimate is speculation.
Technical requirements: lift provision, escape routes, utility connection capacity and fire safety.
Ownership arrangements: is the loft part of the common areas of a building divided into individually owned units? If so, you need the unit owners’ consent.

Stages of preparation and their impact on price

The value of the potential increases with every step that reduces uncertainty:

An idea without supporting documentation: investors attach almost no value to it.
An architectural feasibility study and preliminary consultation with heritage officers: the potential becomes a selling point.
A structural engineer’s report and verified technical solutions: investors can work with specific costs.
Permission granted: the potential is valued almost as a completed scheme less construction costs.

Is it worth securing permission before selling?

Not always. Securing permission in Prague often takes years and costs money. For a smaller project (one or two flats), a feasibility study and preliminary opinion are usually worthwhile: investors can then see that the proposal is more than wishful thinking. For a larger project, it may be more advantageous to sell the building with a verified concept to a developer who can handle the approval process themselves.

The decision should be based on a calculation: how much the price will increase compared with the cost and time involved in preparation.

Other forms of potential

Beyond the loft, opportunities include converting non-residential premises into a flat or vice versa, subdividing large flats, combining smaller ones, courtyard buildings and dividing the building into individual units. Each change has its own legal and technical requirements; investors value a clear, specific explanation of these.

Frequently asked questions

How can I check whether the building is in a conservation zone?

Check the National Heritage Institute’s Heritage Catalogue and Prague’s planning analysis documentation. We would be happy to check this for you.

How much does an architectural feasibility study for a loft conversion cost?

Depending on the scope, tens of thousands to the low hundreds of thousands of CZK. Where a building has genuine potential, this investment usually pays for itself many times over on sale.

Do I need the tenants’ consent?

Not for the sale, but construction work must respect their rights. In a building divided into individually owned units, you need the unit owners’ consent to alter the common areas.

Next step

Does your loft or courtyard have potential? Send us the address and photos. We will tell you whether it is viable and how to reflect it in the price.

Sources

Author: Michal Kopřiva, Pura Vida Property Advisory. Published 25 June 2026. This article is for information only and does not replace legal or tax advice.