Quote: unheated loft floor insulation
E.g.: blowing cellulose wadding at 40cm in an unconverted loft
Will the loft remain unheated, provide storage or become living space? Explain this before the survey. Provide approximate area, access and photographs of the floor and roof, and identify ventilation equipment, ducts and existing insulation.
Define the heated boundary
Confirm whether work concerns the loft floor or roof slopes. Account for a future conversion. Request a sketch of treated areas and connections to other insulation.
Check the ceiling and moisture strategy
Buildwise highlights load capacity, airtightness and ventilation conditions. A membrane-free assembly is not a general rule: its suitability needs justification.
Plan equipment and access
Locate flues, electrical components, ducts and the hatch. Ask for documented protection suitable for each item and a maintenance walkway where needed. Specify storage areas and expected loads before planning a floor.
Define the handover
Request insulation identification, target performance, specified installation thickness and checks. Record what happens to old insulation, excluded repairs and instructions for later work in the loft.
Arrange support before work
Consider the Klimabonus 2026 routes with advice or for a single component. Approval in principle must precede work; have the approved professional confirm building and solution eligibility.
Indicative prices in Luxembourg
On quotation
Compare preparation, the insulation assembly, hatch, protection and maintenance access together. A square-metre rate without this scope cannot establish value. Blown material, rolls or boards must suit the loft; none is universally the cheapest or quickest.
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
What thickness should I request?
Specify performance and thickness for the selected product. One figure cannot suit all assemblies.
Can old insulation remain?
Request inspection and reasons for retention or removal.
Can the loft still store items?
Have a load-bearing surface and access assessed; do not assume insulation can be walked on.
Will work take half a day?
Request a surveyed schedule including preparation and completion. No uniform duration is guaranteed.