Prepared for Jan de Vries · Keizersgracht 142, Amsterdam
Plan date 17 June 2026
Reference SND-2026-0381
Advisor M. Hendriks
D current
→B projected
Your prioritised upgrades
1
Cavity Wall Insulation ISDE subsidy
Insulation beads injected into the wall cavity. One-day job, no interior disruption. Cuts heat loss through the walls by up to 60%.
Est. cost
€3,200
Saves / yr
€480
Payback
6.7 yrs
ISDE subsidy
–€800
ISDE 2026: apply within 24 months. Budget round closes 31 Dec 2026.
2
Hybrid Heat Pump ISDE subsidy
Works alongside your existing HR boiler, covering ~75% of heating electrically. Install after insulation so the unit sizes smaller. Cuts gas use by two-thirds.
Est. cost
€8,500
Saves / yr
€1,100
Payback
7.7 yrs
ISDE subsidy
–€2,500
ISDE 2026 heat-pump allowance, confirmed eligible. Claim before 31 Dec 2026.
3
HR++ Double Glazing
Replace single-glazed windows (street-facing) with HR++ units. Essential for comfort and reaching label B.
Est. cost
€4,800
Saves / yr
€320
Payback
15 yrs
Subsidy
—
No standalone subsidy. Combining with measure 1 raises the insulation allowance.
Recommended sequence
1
JUL 2026
Cavity wall insulation
1 day on site · do this first
2
AUG – SEP 2026
Hybrid heat pump
Permit + install · 6–8 wks
3
OCT 2026
HR++ glazing
2–3 days on site
✓
NOV 2026
Inspection & claim
New label registered: B
Total investment
€16,500
Net after subsidies
€13,200 (–€3,300)
Annual savings
€1,900/yr
Blended payback
6.9 yrs
Ready to move forward?
Book a 30-minute call with your SUNDAE advisor to confirm this plan and kick off works.