Premium family residence, Kifisia
Kolokotroni 27, 14562 Kifisia, Athens, Greece
€1,240,000
Classic Kifisia residence behind an olive-shaded garden wall. Windows were replaced, but roof and walls remain uninsulated and the gas boiler predates 2000 — a staged retrofit with rooftop PV.
- Living area
- 240 m²
- Rooms
- 7
- Built
- 1974
- Occupants modelled
- 4
- Heating
- Gas boiler (pre-2000)
- Region
- Attica
Site & energy profile — Attica
Solar conditions
- South pitched tile roof, light olive-tree shading
- 110 m² usable roof area
- 1,550 kWh/kWp regional yield · 8% shading derate
- Modelled at 1,426 kWh/kWp → 26,096 kWh/yr from 18.3 kWp
Load drivers
- Pre-2000 gas boiler serving radiators across 240 m²
- Cooling load across a west-facing living wing
- One EV plus a workshop in the garden building
- Family of four with mature garden irrigation
Resilience context
Mainland Attica grid — stable supply, rare short outages.
Central Kifisia grid is dependable; the case here is bill reduction and self-consumption rather than islanding.
Indicative storage for this profile: 12 kWh.
Home Energy IQ summary
Home Energy IQ score
Kolokotroni 27, Kifisia, Athens
Attica · 1,426 kWh/kWp modelled yield
Energy demand
219 kWh/m²a
Running cost
€10,004/yr
CO₂ footprint
18.76 t/yr
Potential after retrofit
Indicative annual saving
€3,150
Highest-impact next step
Smart energy manager & hydronic balancing
≈ €462/yr saved · payback 3.9 yrs
Recommended Home Energy IQ system
Property size of 240 sqm exceeds the HOME 10 envelope.
Modelled retrofit plan
Modelled for this Attica property at 1,426 kWh/kWp, with a €45,000 indicative budget and a bill-savings objective. Adjust the assumptions in the simulator to model your own scenario.
Annual saving
€3,150
Net investment
€41,875
incl. €600 subsidies
Simple payback
13.3 yrs
CO₂ avoided
6.24 t/yr
Your recommended Home Energy IQ configuration
HOME 20
Why this fits your property
- A 240 m² property using about 13,280 kWh of electricity a year sits inside the HOME 20 band (12,000–22,000 kWh/year).
- Your roof in Attica supports roughly 17,112 kWh of production a year, which the 10–12 kW inverter and 20 kWh battery are sized to use rather than export.
- EV charging push the evening load up, so storage is sized above the entry system.
Projected solar production
17,112 kWh/yr
12 kWp · 1,426 kWh/kWp in Attica
Self-powered
83%
Catalogue range 65–85%
Estimated backup
10.5 h
Essential comfort loads at ≈1.5 kW
Indicative investment
from €21,900
≈ €231/month over 10 years, excl. VAT
All figures are indicative model estimates for comparison, based on the details you entered. Production, self-powered share and backup duration depend on real weather, occupancy and tariffs. Nothing here is a quotation or a guaranteed performance figure.
Included in this configuration
- Solar PV
- 10–12 kWp
- Hybrid inverter
- 10–12 kW
- Battery
- 20 kWh LFP
- Backup
- Whole Home
- Everything in HOME 10
- Increased battery autonomy
- Whole-home backup
- Smart load prioritisation
- EV optimisation
- Heat pump optimisation
Indicative installed price. Final pricing is subject to property survey, electrical infrastructure, grid connection, roof conditions and final engineering design.
Step 3 · Configure upgrades
Optional improvements
Your system works without any of these. They are shown because something in your inputs suggests they could be worth discussing at the assessment.
EV CHARGE
Charges the car on surplus solar instead of peak-tariff grid power — typically €300–€600 a year on the mileage assumed here.
You reported an electric vehicle.
Charge power and savings depend on your vehicle, tariff and daily driving pattern.
V2H READY
Prepares the electrical architecture so the vehicle could later support the house during an outage.
Only worth adding while the installation is being designed — retrofitting is more disruptive.
Actual vehicle-to-home operation depends on vehicle compatibility and applicable regulation.
ENERGY CARE
Continuous monitoring, alerts and an annual performance review so underperformance is caught early rather than at year end.
Recommended for every installation; can be added or dropped later.
A recurring service subscription, separate from the installed system price.
Step 4 · Payment options
≈ €208.09/month
10% deposit (€2,190) · 10 years · 4.90% p.a. illustrative rate
Modelled energy saving
€262.50/month
Net +€54.41/month
Illustrative repayment estimate only — not a credit offer, quotation or approval. It assumes an indicative 4.90% annual rate, equal monthly instalments and the indicative system price before VAT and any subsidy. Actual terms depend on the lender, your circumstances and the final assessed price.
Step 5 · Confirm with an assessment
Confirm your Home Energy IQ plan
A site assessment validates roof and mounting, the electrical panel and connection, permitting requirements and the final price. Everything above stays an indicative model until an engineer has seen the property.
Your plan so far
- · Recommended system: HOME 20 (Advanced Independence) — from €21,900 excl. VAT, indicative
- · Property profile: Attica · 12 kWp modelled at 1,426 kWh/kWp
- · Modelled outcomes: 17,112 kWh/yr solar · 83% self-powered · ≈10.5 h backup (Essential comfort loads)
- · Options to discuss: base configuration only
- · Financing interest: not reviewed yet
Prefer to read first? Detailed financing calculator · How assessments work
Today
219 kWh/m²a
€10,004/yr · 18,762 kg CO₂
After recommended plan
208 kWh/m²a
€6,854/yr · 12,525 kg CO₂
Projected class movement
Cumulative saving over 10 years (with 3% annual energy price inflation): €36,111
What your recommended system delivers
Every line below is delivered by HOME 20 or one of its optional Home Energy IQ modules — ranked by impact per euro against your goal and budget.
Smart energy manager & hydronic balancing
Cheapest measure per euro saved and the data layer for everything that follows.
Optional add-on: SMART VILLA module
- Net cost
- €1,800
- Saving/yr
- €462
- Payback
- 3.9 y
Rooftop solar PV
Generates power at roughly a third of grid price for 25+ years.
Delivered by your recommended Home Energy IQ system
- Net cost
- €26,535
- Saving/yr
- €3,622
- Payback
- 7.3 y
Home battery storage
Shifts midday solar into evening use and raises self-consumption to ~70%.
Delivered by your recommended Home Energy IQ system
- Net cost
- €11,640
- Saving/yr
- €605
- Payback
- 19.2 y
Smart EV charger (11 kW)
Charges on surplus solar instead of peak-tariff grid power.
Optional add-on: EV CHARGE module
- Net cost
- €1,900
- Saving/yr
- €74
- Payback
- 25.7 y
All figures shown are indicative estimates generated from standardised building models and average market prices. They are not a certified energy performance assessment, an engineering report, or financial advice. Actual savings, costs, subsidies and payback depend on an on-site assessment of your property.
All figures shown are indicative estimates generated from standardised building models and average market prices. They are not a certified energy performance assessment, an engineering report, or financial advice. Actual savings, costs, subsidies and payback depend on an on-site assessment of your property.