Why a commercial building needs an owner-side plan
Retail, office, hospitality and mixed-use assets have different occupancy patterns and comfort requirements. A plant replacement may reduce a technical issue while creating an access problem for tenants. A controls change may be useful only if the operating team can maintain it.
Start with one brief covering performance, comfort, maintenance and disruption. Facility management and energy management then carries the work into day-to-day operation rather than treating handover as the end of the project.
Baseline and remote data collection
For an overseas owner, the first phase can begin remotely. Collect utility bills, meter data, floor plans, operating hours, tenant schedules, equipment lists, maintenance logs and the current energy certificate. The local engineer then verifies the information on site and records what is missing.
The survey should cover the envelope, glazing, shading, HVAC, ventilation, lighting, hot water, controls and meters. Record which zones are critical, when access is possible and whether the landlord or tenant owns each item. A baseline is a working reference for comparison, not a guarantee of future performance.
Retrofit options and constraints
| Area | Smaller intervention | Larger intervention | Owner-side check |
|---|---|---|---|
| Envelope | Sealing and shading | Insulation or glazing | Appearance, moisture, approvals |
| HVAC | Commissioning and service | Plant or distribution | Loads, access, outage |
| Lighting | LED | Zoned controls | Lux, glare, trading hours |
| Controls | Schedules | BMS and sub-metering | Data ownership and support |
| Hot water and renewables | Survey and corrections | New generation | Space, connection, load |
The useful answer is often a sequence, not one product. Correcting schedules or maintenance can make the next capital decision clearer. The brief should show dependencies, expected disruption, temporary measures and who signs off each stage.
What drives cost and priority
Date checked:
| Factor | Low effect | High effect | Note |
|---|---|---|---|
| Envelope and glazing | Sealing and controls | Insulation or replacement | Check moisture, shading, appearance and approvals. |
| HVAC and ventilation | Commissioning and service | Plant or distribution change | Review loads, air quality, access and outage constraints. |
| Lighting and controls | LED replacement | Zoned controls and BMS | Operating hours and user comfort set the priority. |
| Metering and renewables | Sub-metering | Generation and monitoring | Confirm technical and financial feasibility first. |
These factors are indicative. An engineer confirms the actual scope and requirements of the project.
Ask for a technical estimateCapex, payback and funding checks
Capital cost is shaped by survey and design, plant condition, access, procurement, working hours, tenant protection and commissioning. Operating benefit depends on actual use, energy prices, controls and maintenance. Without a baseline, a fixed payback or saving claim is not a sound approval basis.
Funding is a separate workstream. Greece’s Exoikonomo Epicheiro programme has published business guidance, but the current call and evidence requirements must be checked at the point of application. Do not carry eligibility, deadlines or targets from an old call into a new investment memo.
Approvals and local delivery
Works may require a technical study, e-Άδειες or a small-scale works approval, depending on the actual work and property. Façade changes, mechanical routes, fire safety, accessibility and shared building areas often require coordination with the landlord and relevant technical disciplines. The title “energy upgrade” does not decide the permit route. An engineer confirms the position for the specific property.
For a remote client, the delivery pack should identify the local decision-maker, landlord approvals, tenant notices, access windows, procurement packages, safety controls and handover evidence. A weekly report in English can include progress, decisions, cost movement, risks, photos and open actions.
For permitting context, see technical studies and permitting and the building permit guide. The technical classification remains project-specific.
Measurement after handover
Agree the reporting method before works start. Track energy by period, operating hours, comfort, alarms, faults, maintenance completion and any sub-metered loads. Normalise the comparison where weather or occupancy changes the result.
The operating team needs the settings, manuals, as-built information, meter map and maintenance calendar. Preventive maintenance keeps the upgraded systems in the operating condition assumed by the baseline.
Sources: KΕΝΑΚ, Ministry of Environment and Energy, Exoikonomo Epicheiro, gov.gr, Energy certificate procedure, mitos.gov.gr. Last checked: 2026-09-06.
Frequently asked questions
What does a commercial building energy upgrade include?
It can include the envelope, glazing, HVAC, ventilation, lighting, controls, hot water, metering and renewable systems. The correct package follows a measured baseline and a site survey. An engineer confirms the actual scope for the specific building.
How much does an energy efficiency retrofit in Greece cost?
There is no reliable cost per square metre without a survey. Area, fabric, plant condition, access, operating hours, disruption and controls all affect capital cost. Request a baseline and a line-by-line scope before comparing quotations.
Is an energy upgrade mandatory for a commercial building?
There is no universal answer. Requirements can arise from a new build, major renovation, sale or lease, while other improvements are voluntary. The applicable framework depends on the property and work. An engineer confirms the position for the specific building.
Is funding available for a commercial building upgrade in Greece?
Business programmes exist, but opening dates, eligible applicants, targets and evidence change. Check the current programme guide before committing to procurement. A previous call, certificate or funding announcement is not a promise of eligibility for your project.
How do we measure savings after the retrofit?
Agree a baseline, normalise for operating hours and weather where relevant, and track energy, comfort, alarms, faults and maintenance. Sub-metering can separate uses. A result should come from an agreed comparison period, not from two unrelated bills.