Cost: green roof
Distinguish planting work alone from roof renewal before planting. Costs depend on support work, waterproofing, drainage, substrate, plants and access. Compare establishment care and maintenance too; these may be separate from installation.
Editorial update on 18 September 2026
Separate roofing from planting
List assessment, possible stripping, support repairs, waterproofing and checks before planting. Clarify what the installer considers a ready-to-receive substrate.
Detail the supplied system
Specify actual planted area, drainage, filtration, substrate, plants and service zones. Compare project-defined depths and assemblies, plus delivery terms.
Allow for establishment care
Separate construction handover from establishment follow-up. Ask about visits, possible watering, included replacements and exclusions. Price recurring maintenance and the access required.
The three budget levels
Where your money goes
- DesignOn quotationStructure and proposed system.
- SupportOn quotationPreparation and compatible waterproofing.
- PlantingOn quotationDrainage, substrate and plants.
- Follow-upOn quotationDelivery, establishment and care.
What makes the price vary
Purpose
Vegetated covering or accessible garden.
Assembly
Defined planting and layers.
Roof condition
Changes following assessment.
Access
Lifting and future maintenance.
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
Is an extensive roof maintenance-free?
Request a suitable programme. Plant care and outlet inspections still need organising.
Can every existing roof be planted?
No. Structure, waterproofing, drainage and access need assessment for the proposed system.
Can garden soil replace the specified substrate?
Do not change the build-up without design approval; weight and system behaviour need checking.
Does a green appearance at handover guarantee establishment?
Request written acceptance criteria and terms for follow-up, replacement and maintenance.
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