Background
#PV funding for a roof renovation in Aargau is tied to eligible thermal insulation in 2026: the PV bonus is CHF 20/m² for a greened flat roof, CHF 30/m² for a roof-mounted system and CHF 100/m² for in-roof or facade PV.
In the standard case, the building permit year must be before 2000 and the application must be filed before construction starts. For pitched roofs and facades, PV must cover at least 70% of the eligible area for each orientation; flat roofs require 50% and greening. The Energy Division of Canton Aargau reviews the funding documents, while any building permit or notification must be clarified separately with the municipality and EVEN.
For your roof
How much funding does your roof get?
With your address we calculate the one-off payment, your canton’s incentives, tax deduction and regional feed-in tariff for your system.
Free and non-binding · no unsolicited calls
Rather talk directly? +41 78 615 90 58
What counts for funding
#The funding logic starts with the building envelope, not PV alone. Aargau’s 2026 programme funds insulation of roofs and walls or floors against the ground at CHF 40/m², and exterior wall insulation at CHF 60/m². The PV bonus is added only when this envelope refurbishment is eligible.
The system type determines the supplement. The programme lists CHF 20/m² for a greened flat roof, CHF 30/m² for a roof-mounted system on a pitched roof and CHF 100/m² for an in-roof or facade system. These amounts are the PV supplement and do not replace the separate insulation grant.
The area quota must match the reference area. On flat roofs, the bonus requires at least 50% of the eligible roof area and greening. For pitched roofs and facades, at least 70% of the eligible area must be covered; each roof surface is assessed separately by orientation.
Building age and the element involved limit the standard case. Eligible buildings have a building-permit year before 2000 and generally contain building elements that were already heated in the initial state; new additions, extensions and extra storeys are not eligible. For non-residential buildings, the PV bonus is also limited to a maximum of 300 m² of eligible roof area. Protected elements may receive U-value relief where technical impossibility is evidenced.
Technical evidence determines whether the envelope work qualifies. Roofs require a U-value of no more than 0.20 W/(m²K), while walls and floors more than 2 m below ground require no more than 0.25 W/(m²K); exterior walls also use 0.20 W/(m²K). The improvement must be at least 0.07 W/(m²K). From a CHF 10,000 grant, the canton requires a GEAK Plus or an eligible building analysis.
Timing and documents are part of eligibility. The complete application must be received before construction starts; under the general conditions, processing takes four to six weeks. A funding decision is valid for two years, and the canton does not pay grants below CHF 2,000. As a general rule, the limit per building, project or funding item is CHF 50,000 and no more than 50% of eligible investment costs; larger grants are possible only case by case. Planning must therefore start before the PV installation date alone.
The process in six steps
#Tick off for your project
Classify the building and elements
document the building-permit year, initially heated state, protected elements and current and planned U-values. Also record whether the roof, facade or a new addition is being refurbished; this establishes whether the Aargau envelope measure can apply at all.
Calculate the insulation and PV reference areas together
use 50% of the eligible reference area for a flat roof and 70% for each pitched-roof or facade surface. Record greening in the flat-roof design; state the orientations separately for pitched roofs.
Prepare the grant calculation and evidence
calculate the PV supplement by roof type, insulation grant, areas in m² and any minimum thresholds. If the expected grant is CHF 10,000 or more, plan the GEAK Plus or eligible building analysis before the quote is finalised.
Assemble consistent documents
the Aargau programme lists the signed application form, site plan, current photos, quotes, area calculations and before/after U-values. For the PV bonus, include the PV quote with module area and a plan of the eligible area for each orientation.
File the application before construction starts
the current cantonal page directs applicants to the Building Programme portal. The application counts only with the required complete and signed attachments; a funding commitment replaces neither the municipal notification nor any required building permit.
Keep execution and settlement aligned with the decision
Aargau’s Energy Division generally processes applications within four to six weeks. After approval, two years remain for implementation and the completion form; changes from the application must be reported before execution, and invoices, photos and completion documents are required for payment.
Checked for your roof, not just read up on
How much funding does your roof get?
With your address we calculate the one-off payment, your canton’s incentives, tax deduction and regional feed-in tariff for your system.
Free and non-binding · no unsolicited calls
Rather talk directly? +41 78 615 90 58
Frequently asked questions
#Sources
#The responsible authorities are decisive. Always verify binding details – amounts, deadlines and conditions – for your specific property against the current status of the respective authority.