Evidence base for a marina or moorings proposal
Moorings sit across two consenting regimes. Here is the evidence base: licensing boundaries, navigation safety, flood vulnerability, water quality, ecology and dredging.
Marina planning evidence has to satisfy two regulators with different boundaries. Planning permission from the local planning authority covers the land and, in tidal waters, generally extends down to the low water mark. Below that, and for construction, dredging or deposits in the sea, a marine licence from the Marine Management Organisation applies under the Marine and Coastal Access Act 2009. On inland waterways a navigation authority's own consent sits alongside the planning permission. So the first question for any moorings proposal is where your works sit in relation to those lines.
Draw them on the site plan. Applications that do not show the licensing boundary get stuck at validation.
The planning boundary and the marine licence
For a coastal or estuarine site, establish the position of mean high water springs and mean low water springs and show both. Development above low water generally needs planning permission. Works below mean high water springs, including piling, pontoon installation, dredging and the deposit of material, generally need a marine licence, so a single pontoon structure can require both.
On non-tidal rivers and canals the position differs. Planning permission covers the works, and the navigation authority grants its own consent for anything in or over the water, for changes to the bank and for the moorings themselves.
Three practical steps at the outset. Establish which navigation authority or harbour authority has jurisdiction. Ask the Marine Management Organisation whether the proposed works need a licence or fall within an exemption. And ask both bodies for pre-application views in writing, because their requirements shape the layout more than the planning policy does.
Navigation authority consultation
The navigation authority is interested in whether your moorings obstruct or endanger navigation, and that is a technical judgement about the channel rather than a planning one.
What they examine is the width of the navigable channel remaining after the moorings are installed, the swing room for vessels manoeuvring, sightlines for approaching craft, the effect on flows and sediment movement, the adequacy of access and egress under wind and tide, and whether the proposal conflicts with an existing licensed use of the water. On a canal, the additional consideration is the effect on the towpath and on passing traffic in a narrow channel.
Their comments to the planning authority carry real weight, and an objection on navigational safety is difficult to overcome by planning argument. Get the layout agreed with them before you submit.
Also check whether the water body is subject to a harbour revision order, byelaws, or an existing moorings licence regime with a cap on numbers. Those are constraints that no amount of design work removes.
Flood risk, tidal levels and safe access
Water is the setting, so flood risk assessment is central rather than incidental.
The useful point of nuance is the vulnerability classification. Marinas and water-based recreation are classified as water-compatible development, which is the least constrained category and is appropriate even in the functional floodplain where it meets the other tests. Residential moorings and any dwelling, office or clubhouse on land are in higher vulnerability categories and are treated accordingly. A scheme mixing visitor berths with residential moorings and a clubhouse therefore has several classifications in one application, and the Flood Risk Assessment has to address each separately.
The technical content follows the site. Tidal levels including the extreme still water level with a climate change allowance, wave and surge effects, the design level of pontoons and the range of movement in the piles or chains, safe access and egress from each berth to a place clear of flood risk, and the position of any building with its floor level set above the relevant level.
Safe access is the item most often weak. A floating pontoon rises with the water, but the ramp to it and the route across the car park do not, and an escape route that floods before the pontoon does is not safe.
Water quality, fuelling and waste facilities
Marinas concentrate pollution risks, and an application that deals with them properly removes most of the Environment Agency's concerns.
Four arrangements need drawing and specifying. Fuelling, with a bunded tank, a spill kit, an impermeable dispensing area draining to an interceptor, and a written spill response procedure. Sewage, with a pump-out facility and a chemical toilet disposal point connected to foul drainage or a suitably sized holding tank. Boat maintenance, with any hardstanding for pressure washing or antifouling removal bunded and drained to treatment rather than to the water. And general waste with oil, battery and scrap segregation.
Water quality also engages the requirements that apply to the water body itself, where an assessment of the effect on its status may be needed. That assessment is specialist work and is not one of PlanScope's report types, so treat it as a separate commission by a suitably qualified consultant.
Dredging changes water quality too, which is why it is dealt with at the end of any well-organised submission rather than as an afterthought.
Ecology in and around the water body
Estuaries and coastal waters carry a high density of designations, and many are Special Protection Areas, Special Areas of Conservation or Ramsar sites with overlapping SSSI notification.
Screen for those first, then work through the pathways: physical habitat loss under pontoons and moorings, shading of intertidal habitat, disturbance of birds by vessel movement and by people, propeller wash and bank erosion, introduction or spread of invasive species on hulls, and changes to sediment regime that alter intertidal feeding areas. Recreational disturbance is the pathway most often underestimated, because boat movements extend well beyond the application site.
A Preliminary Ecological Appraisal scopes this and identifies the survey windows. Wintering bird surveys run October to March, which can set your programme. Where a habitats site is engaged, the assessment work needs an ecologist experienced in that regime and PlanScope drafts are a starting point for that professional rather than a substitute.
Invasive species deserve a stated procedure. A check, clean and dry regime for visiting vessels, written into the operating rules, costs almost nothing and is the sort of measure an authority will condition.
Parking and landside access
The landside is where the planning objections usually come from, because that is where neighbours live.
Parking demand for a marina is unlike most uses: it peaks at weekends and in the season, berth holders leave cars for the duration of a trip, and boat trailers need oversized spaces and a turning area at the slipway. Show the parking count with its basis, the trailer and towing vehicle provision, tracking for a boat on a trailer through the access, and the arrangement for deliveries and for craning vessels in and out.
An illustrative example. A 40-berth marina on a tidal creek reaches peak demand on summer Saturdays, when roughly half the berth holders arrive within a three-hour window and a handful bring trailers. Parking sized on an annual average would provide around 20 spaces and overflow onto the lane. Sizing on the observed seasonal peak, with four oversized trailer bays and a turning head at the slipway, avoids that. The figures are illustrative and each site needs its own count.
Access roads to waterside sites are often narrow lanes. Where that is the case, address the peak weekend movement honestly, with a count of existing traffic if available, rather than presenting an annual average that hides the Saturday problem.
Lighting over water and dark skies
Lighting a marina badly is easy, because water reflects and there is nothing to absorb spill.
The design should keep light off the water surface, which is both a navigational and an ecological requirement. Bats forage along watercourses and over open water, and lighting a channel can sever a commuting route. Use low-level bollard or handrail lighting on pontoons rather than columns, tight cut-off optics, warm colour temperature, part-night operation outside the season, and no upward spill. A Lighting Assessment with contours, luminaire schedule and a statement on light over the water is what the authority and the navigation authority both want to see, and lighting near a navigation channel must not be capable of confusion with navigational marks.
Dredging and sediment management
Dredging is a separate consenting exercise and a separate cost line.
- Establish the required depth from the design vessel and the tidal window.
- Survey the bed to calculate the volume of capital dredge and the likely maintenance interval.
- Sample and analyse the sediment for contaminants, to the standard the licensing authority requires.
- Identify the disposal route, whether licensed disposal at sea, beneficial reuse, or removal to land for treatment or landfill.
- Assess the effects of the dredge plume on water quality, designated sites and shellfish waters.
- Set the working window to avoid sensitive ecological periods.
- Apply for the marine licence with the assessment attached.
Sediment analysis results drive the disposal route, and disposal cost can exceed the cost of the dredging itself where the material is contaminated. Find out early. The same discipline applies to any waterside leisure proposal, and the evidence base for a glamping site shows how the landside elements stack up on a rural site.
One honest uncertainty. Whether a specific pontoon or mooring arrangement needs a marine licence or falls within an exemption depends on the detail of the works and their location, and the answer is not always obvious from the guidance. Ask the licensing authority for a written view rather than assuming.
Browse all 66 report types on PlanScope to see which documents a marina or moorings proposal is likely to need.
This is general guidance, not legal advice. Check the position with your local planning authority, the licensing and navigation authorities 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.
Frequently asked questions
Do I need a marine licence as well as planning permission?
Often yes for coastal and estuarine sites. Planning permission generally covers development down to the low water mark, while works below mean high water springs, including piling, pontoon installation, dredging and deposits, generally need a marine licence under the Marine and Coastal Access Act 2009. A single pontoon can require both consents.
How are marinas classified for flood risk?
Marinas and water-based recreation are water-compatible development, the least constrained category, which can be appropriate even in the functional floodplain where other tests are met. Residential moorings, clubhouses and offices fall into higher vulnerability categories, so a mixed scheme carries several classifications in one flood risk assessment.
What does a navigation authority assess?
Whether the moorings obstruct or endanger navigation: remaining navigable channel width, swing room for manoeuvring, sightlines for approaching craft, effects on flows and sediment, access and egress under wind and tide, and conflicts with existing licensed uses of the water. An objection on navigational safety is hard to answer with planning argument.
Which pollution facilities does a marina need to show?
Bunded fuelling with an impermeable dispensing area draining to an interceptor and a written spill procedure, a sewage pump-out and chemical toilet disposal point, bunded and drained hardstanding for pressure washing and antifouling removal, and segregated waste storage for oil, batteries and scrap. Draw and specify each rather than describing them.
Why does sediment sampling matter so much for dredging?
Because the analysis determines the disposal route, and disposal of contaminated material to land for treatment or landfill can cost more than the dredging itself. Sample and analyse to the licensing authority's standard early, alongside a bed survey establishing capital dredge volume and the likely maintenance interval.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.