Thermal Upgrade Before the 2026/27 Season — Why May | BOKKA
Most homeowners only start thinking about insulation in September, when the temperature drops outside. Yet May and June are the best time for a thermal upgrade (energy retrofit). Here we explain why — and show you how to plan the work to be ready before the 2026/2027 heating season.
The Thermal Upgrade Season Starts in SPRING, Not Autumn
It may be surprising, but the facts speak for themselves: insulation contractors are busiest between September and November — that is when everyone finally notices that their home is losing heat and rushes to find a tradesperson. The result? 2–3 months’ wait for a slot, higher prices, and the kind of haste that does not favour quality workmanship.
Spring and early summer offer:
- Contractor availability — diaries are still open, so you can negotiate both dates and price,
- Optimal weather conditions — most insulation systems require temperatures above 5 °C and dry conditions,
- Time to source materials — no panic buying; you can compare offers and choose the right product rather than “anything, just quickly”,
- Peace of mind before autumn — a finished, well-insulated home before the first cold snap.
Checklist: What to Plan Right Now
1. Energy Audit — or at Least a Basic Assessment
Before you purchase any materials, decide what and where to insulate. The most common areas with the greatest energy-saving potential:
- Pitched roof or flat roof (up to 30% of heat loss in uninsulated homes),
- Ceiling beneath an unheated loft (15–25%),
- External walls (20–25%),
- Ground floor and ceiling above the basement (10–15%).
2. Choice of Material — Lambda Matters
The lower the thermal conductivity λ (lambda), the better the insulation at a given thickness. A comparison:
- Mineral wool / stone wool: λ = 0.035–0.040 W/(m·K)
- Polystyrene EPS: λ = 0.031–0.038 W/(m·K)
- PIR insulation boards: λ = 0.022 W/(m·K) — the lowest value on the market
In practice: 10 cm of PIR board delivers the same insulation performance as approximately 16 cm of mineral wool. This is particularly important for pitched roofs (less loss of living space) and for retrofit projects where increasing the overall build-up is not an option.
3. Plan the Logistics
- Material delivery lead times — in peak season these can stretch considerably; in May/June typically 7–14 days,
- Contractor team (or self-installation),
- Any planning permissions required (for larger works or listed buildings),
- Financing — whether you are using the “Czyste Powietrze” grant scheme or the thermal modernisation tax relief.
PIR Boards — A Proven Solution for Modern Energy Retrofits
BOKKA’s range includes a full cross-section of polyurethane boards for different applications:
- termPIR® — universal insulation boards for roofs, walls, and floors,
- termPIR® AL — with aluminium facing, ideal for above-rafter loft applications,
- termPIR® Agro — resistant to harsh conditions, for agricultural buildings,
- GS insPIRe® — sandwich panels for industrial buildings and warehouses.
All products feature an exceptionally low λ value, fire reaction class B-s1, d0, moisture resistance, and dimensional stability over decades.
Time to Start — Quotation Within 24 Hours
If you are planning insulation this spring or early summer, contact us now. Our technical team will help you select the right product for your project and prepare a quotation within 24 hours.
Do not wait until September, when contractors are overloaded, prices rise, and there are only a few weeks left before the first frost. Plan now, insulate in summer, save in winter.