Cost: rainwater collection and storage
Compare a complete installation: tank, collection, possible excavation, distribution, controls and reinstatement. Offers should specify the same uses and quantities. Separate investment, operating expenses and possible aid; do not subtract an assumed grant from the quoted price.
Editorial update on 19 September 2026
Separate construction items
Itemise tank, transport, any lifting, site preparation and soil removal. Add collection, filtration, any pump, controls, distribution and connections. State lengths and supplied outlets for a meaningful comparison.
Include operating expenses
Identify electricity, consumables, visits and replacements outside the initial quote. Request assumptions behind claimed savings. Storage capacity alone demonstrates neither drought autonomy nor rapid payback.
Check aid before calculating your contribution
Guichet.lu describes conditional state aid, not automatic support for every garden tank. Supplying at least one toilet per dwelling and an inspection are among its conditions. Consult the complete procedure, evidence requirements and deadlines.
The three budget levels
Where your money goes
- StorageOn quotationTank, delivery and installation.
- CollectionOn quotationDownpipes and specified equipment.
- DistributionOn quotationSupplied outlets and controls.
- HandoverOn quotationTests, documents and defined services.
What makes the price vary
Uses
Garden only or indoor outlets.
Site
Access, installation and reinstatement.
Network
Distances and alterations.
Upkeep
Operation and 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 the tank price the final budget?
Add required work, equipment, connections, tests and reinstatement.
Is aid guaranteed on purchase?
No. Confirm your case under the cited procedure before counting that funding.
Will it pay back quickly?
Request explicit assumptions about usage, expenses and total cost; no payback period is guaranteed here.
How do I compare garden-only and indoor supply?
Request separate options with outlets, equipment, work and ongoing service costs.
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