Supporting documents for residential moorings

Living aboard at a fixed berth is development. A boat that stops being a vessel in transit and becomes somebody's home changes the use of the land, the bank and the water it sits on, and that is a material change of use under section 55 of the Town and Country Planning Act 1990. So the residential moorings planning documents a council expects begin with a planning statement describing the use in planning terms and a flood risk assessment, because a mooring sits in the river or canal by definition. What else is needed turns on three things: how many berths, where the sewage goes, and what lives on the bank.

Whether residential use of a mooring needs permission

Three situations get run together, and they are not the same.

A leisure mooring, where boats arrive, stay a while and move on, is usually part of the lawful recreational use of the waterway. A residential mooring, where a vessel is occupied as a sole or main residence at a berth it does not give up, is a separate use and normally needs permission. Between the two sits the mooring that has slid into residential occupation over years, which may already be lawful through the passage of time. The only way to confirm that is a certificate of lawfulness of existing use under section 191 of the 1990 Act, not an assurance from anyone at the marina.

The application is for the use of the land and water, not for the boat. Councils tend to describe it as change of use of moorings from leisure to residential, with a figure for berths, because that figure drives parking, drainage and refuse. Get the number right in the description of development. Permission for four berths does not stretch to six.

Officers will also ask whether a particular houseboat has become a building. Where a vessel is permanently connected to services, held in place and can no longer move under its own power, it may be assessed as operational development rather than a change of use, which alters both the tests and the conditions. Set your position out plainly in the planning statement instead of leaving the case officer to settle it.

Navigation authority consent runs alongside the application

Planning permission does not give you a berth. On most canals and several rivers the navigation authority is the Canal & River Trust. On the non-tidal Thames, the Medway and the Anglian rivers it is the Environment Agency. On the Norfolk and Suffolk Broads it is the Broads Authority, which is the local planning authority there as well. A berth needs the navigation authority's agreement, and the boat on it needs a licence, which in practice needs a home mooring.

Ownership matters too. The bed and the banks are often in different hands from the marina business, so work out who owns what before completing the ownership certificates and serving notice under the Town and Country Planning (Development Management Procedure) (England) Order 2015. An application validated on the wrong certificate is vulnerable later.

Foul drainage, water supply and refuse

This is where residential mooring applications most often come unstuck. Pump-out tanks and chemical toilets are adequate for cruising and thin as a permanent arrangement for a household, and councils know it. A foul sewage assessment should say where the sewage goes, who empties it, at what interval, what the storage volume is per berth, and what happens during the week the pump-out station is broken.

If the scheme relies on a package treatment plant on the bank discharging to the watercourse, environmental permitting sits on top of planning, and the same evidence problems arise as on any site served by a private treatment plant. A connection to the public sewer under section 106 of the Water Industry Act 1991 is the stronger answer where the main is reachable.

Water supply needs the same treatment: a metered supply, pipework protected against freezing, and a standpipe arrangement that works in January rather than only in July. For refuse, show a bin store sized to your council's own collection standard and within its published carrying distance of the collection point. Those distances vary by authority, so check the council's refuse and recycling guidance rather than guessing.

Flood risk and the safety of people living afloat

Residential use is a more vulnerable use in the flood risk vulnerability classification, and a mooring is in the water. The Flood Map for Planning will show Flood Zone 3, so the sequential test and, depending on the classification, the exception test come into play.

The sound argument is that a mooring is water-compatible by nature and cannot sensibly be put somewhere drier. Councils accept that for the berth and then ask harder questions about the occupants. A flood risk assessment for a residential mooring should cover:

• safe access and egress to a dry route in the design flood event, with levels given, not asserted
• mooring and rise-and-fall arrangements that work at the design flood level plus the current climate change allowance for the river basin district
• a flood warning and evacuation plan naming who acts, how occupants are told and where they go
• residual risk, including the realistic case where the towpath or access lane floods before the water reaches the deck

The Environment Agency's climate change allowances are revised from time to time, so take the figures from the current published allowances rather than from an older report.

Access, parking and the shore side

Towpaths are rarely designed for household traffic. Expect the highway authority to want the vehicle access, visibility and turning shown properly, and expect the navigation authority to resist anything that makes the towpath a car park.

Where on-street parking is already under pressure, a parking survey using the Lambeth methodology gives the council something to work with instead of an argument. Fire service access also comes up: the local fire and rescue service will comment on appliance access and on water supply for firefighting, and a berth 200 metres down an unmade track invites a refusal on that ground alone.

Bank habitat, water quality and biodiversity gain

Watercourse margins are good habitat and bad places to be careless. Water vole surveys run roughly April to September, otter signs can be looked for year round, and bankside trees may hold roosting bats, so a preliminary ecological appraisal early in the programme costs less than losing a season. Survey work and any licence require a suitably licensed ecologist under the Wildlife and Countryside Act 1981 and the Conservation of Habitats and Species Regulations 2017, and a draft is only a starting point for that person.

Mandatory biodiversity net gain under the Environment Act 2021 applies to most development, with the 10 per cent gain and 30-year management period secured through a biodiversity gain plan. Watercourses are measured in watercourse units in the statutory metric, which behave differently from area habitats, and a vertical piled edge scores badly. A softened margin, a reed fringe or a backwater can carry a surprising share of the gain. The metric must be completed by a competent person, and a biodiversity net gain assessment draft should be checked by one.

Noise, smoke and light over water

Sound travels further over flat water than over ground, which catches people out. Generators and engines run to charge batteries, stoves burn through the winter, and both become complaints. Where the site falls in a smoke control area, the Clean Air Act 1993 limits what may be burned, and statutory nuisance under Part III of the Environmental Protection Act 1990 sits behind that whatever the planning permission says.

Lighting deserves a short section of its own. Marina lighting spills across the water and into the opposite bank, and the Institution of Lighting Professionals guidance on obtrusive light sets out the environmental zones councils use. Low-level bollard lighting on the pontoons, with columns kept off the water's edge, usually gets through.

Sequencing the consents

1. Check the Flood Map for Planning and ask the navigation authority whether residential berths are possible at all before spending money.
2. Establish who owns the bed and the banks, so the ownership certificates and notices are right first time.
3. Commission the ecological appraisal early, because water vole and bat work has seasons.
4. Use pre-application advice and ask specifically about drainage, refuse and parking standards.
5. Prepare the planning statement, flood risk assessment with sequential test, foul sewage assessment and ecology reports as one coherent set.
6. Submit, then expect consultation responses from the lead local flood authority, the Environment Agency and the navigation authority.
7. Discharge the pre-occupation conditions, which on these schemes usually cover drainage, lighting and the flood evacuation plan.

And keep the berth count consistent across every document. Inconsistency between the drawings, the drainage note and the description of development is the commonest validation query on this kind of application.

You can see which of the 66 report types a waterside site is likely to need by browsing the report categories and starting a draft.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.