Audit and preparation
Energy audit and class F certificate. Detailed design, the co-owners’ decision and an application for funding under the National Recovery and Resilience Plan.
Slavonski Brod · Energy renovation
Our building.
New energy.
70% less energy for heating.
Trg pobjede 24–26. Our 30-apartment building has been renovated with approximately 80% EU funding. A new chapter for our community.
* Projected energy savings for heating. Subject to confirmation through a new energy performance certificate following renovation.
NPOO.C7.2.I1.01.0586 · Renovation completed · 2026
Investing in a more comfortable home.National Recovery and Resilience Plan 2021–2026
F → CProjected energy rating for heating
−70 %Estimated energy savings for heating
10.66 kWpDesigned capacity of the solar PV system
30Apartments · 3 entrances · one community
01 / Our story
From 1953 towards a more sustainable future.
Around thirty families live at Trg pobjede 24, 25 and 26 in Slavonski Brod. The building was first occupied in 1953 and had no thermal insulation before the renovation.
The 2024 energy audit placed it in energy class F. The co-owners decided to change that story: they prepared a project and applied for energy renovation funding under Croatia’s National Recovery and Resilience Plan.
First occupied in 1953; the official records identify the building as constructed before 1968.
A new façade, the same address and community.
02 / A visible transformation
One building.
Two views.
Drag the divider or play the animation to compare the building before and after its energy renovation.
BEFORE RENOVATIONAFTER RENOVATION↔
The original photographs were taken from different angles. This is a visual comparison, not a geometrically aligned image.
Lower consumption.
A more comfortable home.
Post-renovation energy indicators are based on design calculations. Actual consumption is monitored during use.
Energy rating / heating
From energy class F towards class C
C — the projected rating after renovation. Select F to see the original rating.
What do the projected savings mean?
The thermal energy required for heating falls from 225.5 to 68.1 kWh/m² per year. The estimated reduction in CO₂ emissions is 78.5 tonnes per year.
Primary energy: D → B. Actual bills also depend on energy prices, the weather and residents’ habits.
| Indicator | Before renovation | Projected after renovation | Change |
|---|---|---|---|
| Energy rating for heating | F | C | +3 classes |
| Energy required for heating | 225.5 kWh/m²/year | 68.1 kWh/m²/year | −69.8 % |
| Primary energy rating | D | B | +2 classes |
| Total delivered energy | 532,153 kWh/year | ~197,831 kWh/year | −62.8 % |
| CO₂ emissions | 124.2 t/year | ~45.7 t/year | −78.5 t/year |
| Heat loss coefficient | 1.91 W/m²K | 0.62 W/m²K | −67.5 % |
| Share of renewable energy | 0 % | ~5 % | Solar PV system |
| Estimated cost savings | — | ~€21,000/year | Entire building |
Data sources: the energy audit and certificate (2024) and the detailed design by 8 SMJEROVA d.o.o. Post-renovation figures are projected.
03 / Renovation measures
Eleven measures.
Much more than a façade.
Thermal protection, renewable energy and more comfortable shared spaces. Open a measure to see its technical details.
01 / MEASUREFaçade insulation (ETICS)
MW 15 cm · λ ≤ 0.035 W/mK · U ≈ 0.20 W/m²K
Around 2,100 m² of external walls were insulated with 15 cm of stone mineral wool. Mineral wool is non-combustible (class A1), vapour-permeable and provides excellent sound insulation. The façade was finished with silicone render in Soft Premium Greige tones (Chromos Svjetlost, shades A51 and K31). All damaged surfaces and balconies were repaired beforehand.
02 / MEASURERoof insulation
Pitched roof MW 20 cm · flat roof MW 15 cm
The ceiling below the pitched-roof attic received 20 cm of mineral wool, and the flat roof received 15 cm. Existing bituminous layers on the flat roof were removed and replaced with new liquid-applied waterproofing.
03 / MEASURESolar photovoltaic system
10.66 kWp · 26 × 410 W · Fronius Symo 10.0-3-M
The flat roof accommodates 26 monocrystalline 410 W modules, totalling 10.66 kWp, with a 10 kW Fronius inverter. Estimated annual generation is 11,415 kWh, supplying communal lighting and future electric vehicle chargers, with surplus electricity exported to the grid.
04 / MEASUREGreen façade
Hedera helix · ~115 m² · irrigation
Ivy (Hedera helix) was planted across approximately 115 m² of the building’s southern façade, with automatic irrigation. The greenery cools the façade in summer, filters the air and brings nature back into the city centre.
05 / MEASUREBasement ceiling insulation
EPS 6 cm
The basement ceiling, beneath the ground-floor apartments, was insulated with 6 cm of EPS to reduce heat loss from the apartments into the basement.
06 / MEASUREPlinth insulation
XPS
The base of the building was insulated with moisture-resistant XPS boards to address the thermal bridge at ground level.
07 / MEASUREStairwell smoke ventilation
3 motorised windows
Each of the three stairwells has a motorised smoke ventilation window that opens automatically in the event of a fire, improving residents’ safety.
08 / MEASURECommunal LED lighting and electrical works
LED · 79% lower lighting consumption · EV charger preparation
Lighting in the stairwells and basement was replaced with efficient LED lighting, with estimated savings of 2,290 kWh per year (79% lower lighting consumption). The works also included upgrades to communal electrical distribution boards and preparation for an EV charging connection.
09 / MEASUREElectric vehicle charging point
Details to follow
An electric vehicle charging measure was completed as part of the renovation. Detailed specifications of the charging point will be added later.
10 / MEASURECondensing gas boiler
Details to follow
A condensing gas boiler was installed as part of the renovation. The model, location and detailed technical specifications will be added later.
11 / MEASUREBicycle parking
Details to follow
Bicycle parking was provided as part of the renovation. The number of spaces and installation details will be added later.
Replacing apartment windows was not part of the project. Details of the EV charging point, boiler and bicycle parking will be added later.
04 / Funding
European support.
A shared investment.
The project is funded by the European Union through the Recovery and Resilience Facility – NextGenerationEU, under Croatia’s National Recovery and Resilience Plan 2021–2026.
Total eligible project costs598422.75 €
Total grant funding479831.95 €
■ EU grant ≈ 80%■ Remaining amount: €118,590.80
Official project figures. The grant covers approximately 80% of eligible costs (the ratio of the stated amounts is 80.18%).
The contracting body is the Environmental Protection and Energy Efficiency Fund. The call is administered by the Ministry of Physical Planning, Construction and State Assets. Eligible costs include construction works, professional supervision, design documentation, the energy audit and certificate, and project publicity and visibility.
Project reference: NPOO.C7.2.I1.01.0586 · Component C7.2, investment I1 “Energy renovation of buildings”.
Views and opinions expressed are those of the author only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.
05 / Project journey
From a shared decision to a new façade.
Grant and works contracts
The grant agreement was signed with the Fund (FZOEU). Procurement and contracting with KONSTRUKT POŽEGA d.o.o. followed; the works contract was signed on 27 November.
Energy renovation
The works are complete. The building now has new thermal insulation, a renewed façade and measures for more efficient energy use.
06 / Photo story
The transformation from every angle.
Ten original photographs of the building and the works. Select a photograph to enlarge it.
See the animated before-and-after comparison in the Results section.
07 / Sharing our experience
Your building can
start a new chapter too.
Less energy
Better thermal insulation reduces the energy needed for heating.
More comfortable apartments
More consistent temperatures and warmer internal wall surfaces.
Long-term value
An investment in living standards and building maintenance.
Better shared spaces
A renewed façade, more efficient lighting and improved safety.
Illustrative calculator
How much funding could your building receive?
Grant in an 80% funding scenario400000.00 €
Co-owners’ 20% share100000.00 €
An illustrative scenario, with no guarantee of funding. Actual grant rates and eligible costs depend on the terms of the individual funding call.
Six steps towards renovation
- Co-owners agree on a shared goal.
- An energy audit and certificate establish the starting point.
- A detailed design and cost estimate are prepared.
- Co-owners make a decision under the call conditions and applicable rules.
- The project is submitted and a funding decision is issued.
- Procurement and construction proceed under professional supervision.
Current funding calls: FZOEU ↗ · Ministry ↗
08 / Documents
Open and transparent.
An overview of the project documentation. Download links will be activated later.
Design documentation
Procurement and contracts
Implementation and visibility
Documents are not currently available to download. Please contact the co-owners’ representative for information.
09 / Project team
The people and teams behind the renovation.
Client
Community of co-owners
“Zgrada Trg pobjede 24-26”
Trg pobjede 24-26, Slavonski Brod
Tax ID (OIB): 58066329893
Representative: Tin Horvatin, mag. oec.
Works contractor
KONSTRUKT POŽEGA d.o.o.
Hrvatskih dragovoljaca 13B, Novo Selo, Požega
Tax ID (OIB): 76065779736
Director: Davor Čeregović
Professional supervision
Predrag Masleša
Civil engineer (dipl. ing. građ.)
Professional registration G 3914
8 SMJEROVA d.o.o.
Pavla Kneževića 44, Vranovci, Bukovlje
Designer
8 SMJEROVA d.o.o.
Design and supervision
Detailed energy renovation design, July 2024.
Building manager:
K-Grupa d.o.o.
10 / Contact
Let’s talk
about our building.
For co-owners’ questions, reporting defects or sharing experiences of energy renovation.
Community of co-owners
“Zgrada Trg pobjede 24-26”
Trg pobjede 24-26
35000 Slavonski Brod
Representative: Tin Horvatin, mag. oec.
11 / Frequently asked questions
Answers in one place.
How much did the renovation cost and who paid?
Total eligible project costs are €598,422.75 and total grant funding is €479,831.95. The remaining amount is €118,590.80. The grant covers approximately 80% of eligible costs.
What did the renovation include?
The project includes façade, roof, basement and plinth insulation, a photovoltaic system, a green façade, stairwell smoke ventilation and LED lighting. It also includes measures for electric vehicles, a condensing boiler and bicycles; their technical details will be added later.
Were the apartment windows replaced?
No. Replacing windows in apartments and communal areas was not part of the project. New aluminium window sills were included in the façade works.
Have the 70% savings already been measured?
No. This is a projected reduction in the thermal energy needed for heating, based on the design values of 225.5 and 68.1 kWh/m² per year. Actual consumption will also depend on weather conditions and how the apartments are used.
When will the new energy certificate be available?
An energy audit is carried out after the works and a new certificate is issued. The projected rating is C for heating energy demand and B for primary energy. The new certificate has not yet been provided for publication.
How much electricity does the solar system generate?
The designed capacity is 10.66 kWp, with estimated annual generation of 11,415 kWh. Electricity supplies the building’s communal needs, with any surplus exported to the grid.
Who maintains the green façade?
The green façade has automatic irrigation. Routine upkeep and system checks form part of the building’s maintenance.
Who should I contact about a defect in the works?
Contact the co-owners’ representative at energetska@trgpobjede.eu. The report is forwarded to the contractor and supervising engineer. The warranty period will be published after the contract has been checked.
Where can I see the financial reports?
A summary is available in the Funding section. Documents will be available after preparation for publication. Co-owners can request further details from their representative and the building manager, K-Grupa d.o.o.
How can another building obtain renovation funding?
Check the relevant call conditions on the official websites of FZOEU and the Ministry. Preparation generally includes an energy audit, design, cost estimate and co-owners’ decision. This website does not determine eligibility conditions or the required voting share.
How long did preparation and renovation take?
Approximately two years: from the energy audit and design in 2024, through the grant agreement and works contracts in 2025, to completion in 2026.
Can we contact you for advice?
Yes. Representatives of other buildings can email energetska@trgpobjede.eu to share experiences of preparing and implementing a renovation project.