Cost: external wall insulation
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.
Editorial update on 18 September 2026
Make measurements comparable
Specify opening deductions and pricing for reveals, bases and returns. Do not compare an intricate façade with a plain wall solely by total square metres.
Separate access, preparation and system
Itemise site setup, scaffolding, planned repairs, insulation, fixings and finish. Agree exclusions and approval of repairs only discovered during preparation.
Price interfaces
List equipment removal and reinstatement, new sills, roof junctions and protection of surroundings. Compare weather constraints, hire duration and final cleaning. Do not assume a fixed surcharge for any finish.
The three budget levels
Where your money goes
- PreparationOn quotationDiagnosis, repairs and access.
- SystemOn quotationInsulation, fixings and finish.
- InterfacesOn quotationOpenings, wall base and roof.
- EquipmentOn quotationRemoval, adaptation and reinstatement.
What makes the price vary
Façade
Condition, geometry and openings.
Access
Height and site layout.
Project
Performance and selected finish.
Coordination
Windows, roof and equipment.
Indicative scenarios
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.
Your exact price, in 2 minutes
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