Home · Guides · Rainwater harvesting conditions on UK planning decision notices

Why rainwater harvesting conditions appear

Commercial, school and warehouse schemes often receive conditions requiring rainwater harvesting tanks, header tanks or irrigation connections to reduce potable water demand.

Applicants read those clauses to programme discharges before landscaping completion or before first occupation.

Cross-read drainage and flood risk conditions, surface water drainage conditions, and landscaping and tree protection conditions.

Common harvesting wording patterns

Pre-commencement vs pre-occupation

Tank installation may be pre-commencement while connection to fittings is pre-occupation. DecisionBrief classifies triggers from the sealed notice — it does not reorder your programme.

Outline permissions may reserve harvesting details until reserved matters — read outline vs full permission guides.

See pre-commencement vs pre-occupation and outline vs reserved matters conditions.

Worked example

Condition 14: “No development shall take place until details of the rainwater harvesting system including tank capacity, feed routes and overflow connection have been submitted to and approved in writing by the Local Planning Authority.” Notes:

• Trigger: Pre-commencement — blocks groundworks until approval.
• Scope: Capacity and routes — three submittals may be combinable per officer practice.
• Overflow: Cross-reference SuDS condition for discharge point.
• Approved plans: Check whether roof layout already fixes gutter positions.

Common misreadings

• SuDS condition assumed to include tank specification. Read harvesting condition number separately.
• Landscaping irrigation line treated as harvesting approval. Different triggers and consultants.
• Water efficiency BREEAM note treated as discharged by planning condition. Separate compliance routes may apply.
• Reserved matters assumed complete when outline granted. Harvesting may be reserved.

Discharge reading checklist

1. List harvesting conditions with numbers and triggers.
2. Map overlap with surface water and foul drainage conditions.
3. Pull approved plan references for roof and hardstanding drainage.
4. Note whether connection to toilets is pre-occupation.
5. Record informatives separately — see informatives vs numbered conditions.

Materials and external works crossover

External materials conditions may govern pipework visible on elevations while harvesting specs sit in engineering schedules.

EV charging infrastructure conditions may share plant room space with tanks — read EV charging guide for stacking trades.

See external materials and colour conditions and EV charging infrastructure conditions.

Officer report vs sealed notice

Committee reports may discuss harvesting benefits while the sealed notice carries the enforceable condition — DecisionBrief reads the sealed PDF you name.

Delegated vs committee wording guide helps when conditions are added after officer recommendations change.

See decision notice vs officer report and delegated vs committee wording.

Which conditions need discharge

Harvesting approvals are often pre-commencement discharges — log them in the same tracker as drainage approvals.

Which conditions need discharge application guide lists typical LPA portal steps — DecisionBrief does not submit discharges.

See which conditions need discharge and how to read planning conditions.

Approved plans and drainage drawings

Approved plans conditions may fix gutter positions while harvesting tank size remains for later approval — read approved plans conditions guide.

Refuse and bin storage conditions sometimes compete for rear yard space with tank footprints — programme layouts early.

Waste management conditions may require construction phase water reuse statements — cross-link when demolition phase harvesting is mentioned.

Renewable energy solar conditions may share roof area with harvesting headers — read solar conditions for panel vs tank zoning.

See approved plans conditions and refuse and bin storage conditions.

Ecology and heritage sequencing

Ecology wildlife survey conditions may delay roof works that feed harvesting headers — programme surveys before ordering tanks.

Heritage listing conservation conditions may restrict visible pipework on listed elevations — read heritage guide when routes are constrained.

Archaeology condition wording may affect excavation for buried tanks — sequence watching briefs before civils.

Air quality monitoring conditions may require dust controls during tank installation — cross-read during construction.

See ecology wildlife survey conditions and heritage listing conservation conditions.

Informatives reminder

Informatives vs numbered conditions guide explains why advisory notes on harvesting do not replace discharge obligations.

Where to find sealed decision notice LPA portal guide helps when harvesting wording appears only in the PDF attachment.

See informatives vs numbered conditions and where to find sealed decision notices.

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