Energy renovation of an apartment block: procedure and execution

Published: 6 July 2026
Reviewed by: the Practic d.o.o. expert team

An energy renovation is not the purchase of a single offer. It is a project that brings together the technical solution, the owners' decisions, financing, tender documents, the contract and supervision of the work.

First the condition, then the solution

Before deciding, the condition of the building envelope and systems, energy consumption, urgent maintenance and the interaction of measures must be assessed. A new façade without fixing leaks, or poor coordination with the roof, can cause extra costs.

Financial plan

Possible sources include the reserve fund, temporarily increased contributions, loans and current incentives. Eko sklad (the Slovenian Environmental Public Fund) conditions change, so they must be checked for each project and before ordering works. The financial plan must also include design, supervision, unforeseen works and taxes.

The owners' decision

Owners must receive enough information for a reasonable decision: a description of the measure, a cost estimate, the financing method, the timing and the consequences of not doing it. The required majority depends on the type of transaction and the chosen financing.

Tender and comparison of offers

Bidders must work from the same bill of quantities. Materials, quantities, preparatory works, protection, deadlines, references, guarantees and the billing method must be compared. The lowest total price without checked quantities can quickly become the most expensive offer.

Contract and professional supervision

The contract should set deadlines, responsible persons, insurance, guarantees, contractual penalties, acceptance of works and the handling of additional works. Independent professional supervision must check that the work matches the documents, not just that the contractor is on site.

Closing the project

At the end you need a handover record, remedy of defects, guarantees, proof of materials, the final account and archiving of documents. It is worth monitoring the effect of the renovation after completion too.

Practic manages renovations from preparing the decisions to the final account. Tell us about your building's plans.