Quote: external wall insulation
E.g.: 16cm mineral wool EWI + render on a 1980s house
Provide photographs of each elevation, available measurements and observed defects. Identify planned replacement windows, shutters, downpipes, property boundaries and scaffold access. Define the complete project before selecting material or thickness.
Assess substrate and system
For ETICS, Buildwise highlights compatible components and substrate checks. Identify the proposed system and preparation. This Belgian technical reference does not establish Luxembourg legal requirements.
Distinguish render systems and cladding
Request the complete assembly and documentation: insulation, fixings and finish. For cladding, specify subframe, opening details and any designed air cavity. Do not compare insulation supply alone.
Draw project boundaries
Request base, window, roof and balcony details. Price sills, shutters, downpipes, lights and external fixings. Identify untreated areas and ask how they enter the thermal assessment.
Check the project with the municipality
Present finished thickness, colour, appearance and any boundary projection. Confirm required permissions and agreements before ordering. A grant does not replace this check.
Prepare support and handover
For Klimabonus 2026, assess advice and single-component routes and obtain approval in principle before work. Request product records, junction photos, acceptance records and care instructions. Justify support and VAT separately.
Indicative prices in Luxembourg
On quotation
Compare quotations with equal area, performance target and specified finish. Preparation, scaffolding, junctions and equipment adaptations also affect cost. No unsupported local average or automatic energy-rating improvement is stated.
Subsidies and grants
No grant is deducted from the budget shown here. If a quote mentions support, request the exact scheme and confirmation of your eligibility before including it in financing.
Frequently asked questions
Does it eliminate every thermal bridge?
Junctions and untreated areas require assessment. The method alone does not guarantee elimination.
Is render always cheaper than cladding?
Compare suitable complete systems including preparation and details.
What thickness should I choose?
Request justification based on wall, product, thermal target and project constraints.
Can insulation precede window replacement?
Coordinate junctions and sequence to avoid rework. No single order suits every building.