Planning permission for a self-build on a serviced plot

Self build planning permission on a serviced plot is rarely a blank sheet. Most plots are sold with outline or full permission already in place, a design code or plot passport setting the parameters, and a list of conditions you inherit whether you like them or not. The planning work is therefore about reserved matters, discharging conditions and protecting the levy exemption rather than establishing the principle of a house. And the two things that most often cost a self-builder months are the utility connections and the paperwork that has to be filed before a spade goes in the ground.

What the plot permission usually already covers

A serviced plot, in the sense used by the Self-build and Custom Housebuilding Act 2015, is a plot with access to a public highway and connections for electricity, water and waste water, or one that can be provided with those things within a specified period. Relevant authorities keep a register of individuals and associations seeking such plots, and have a duty to have regard to it in exercising their planning functions.

What comes with the plot varies more than the marketing suggests. Read the permission and the approved drawings before you offer, and establish four things.

Whether the permission is outline with reserved matters, full permission for a specific house type, or permission in principle followed by technical details consent. Whether the permission is for the whole site with your plot as one part, which affects who controls the conditions. What has already been discharged, and by whom. And whether the permission has been implemented, because on a wider site the developer's start may already have implemented it for everyone.

That last point cuts both ways. An implemented site permission removes the risk of lapse and brings the completion notice regime into the picture if the wider scheme stalls.

Reserved matters and the design parameters

Where the plot has outline permission, you apply for approval of reserved matters, usually appearance, landscaping, layout and scale. The application to approve reserved matters must be made within three years of the outline permission, and development must then begin within two years of the final approval, unless the conditions say otherwise.

Design freedom is normally constrained by a plot passport or design code attached to the permission. These typically fix the building zone, maximum ridge and eaves heights, the number of storeys, materials palettes, boundary treatments, parking position and sometimes window positions on sensitive elevations.

Work within them. A reserved matters application that departs from an approved design code invites refusal on a point that has already been decided, and the route to changing a code is an application to vary the relevant condition rather than an argument in the design statement. A design and access statement that shows compliance with each parameter in turn, with the drawing reference against each, is the quickest way through.

Conditions you inherit with the plot

Ask for a schedule of conditions with their status before exchange. The categories that matter are pre commencement conditions, conditions requiring approval before occupation, and conditions imposing continuing obligations.

Two traps recur. A condition removing permitted development rights on the plot means the garden room you assumed you could build later needs permission. And a site wide pre commencement condition that the promoter has not discharged blocks your start even though it has nothing to do with your house.

Where drainage details sit with you, a drainage strategy sized from an infiltration test on your plot rather than from the estate wide assumption is what the authority will want.

The levy exemption and its procedural traps

The Community Infrastructure Levy self-build exemption is generous and unforgiving. The sequence, under the levy regulations, is what catches people.

1. Assume liability for the levy, in writing, before development starts.
2. Submit the self-build exemption claim and receive the authority's written acknowledgement that the exemption is granted, before development starts.
3. Submit a commencement notice, and receive acknowledgement, before development starts.
4. After completion, submit the supporting evidence within the period the regulations allow, which is measured from the date of the compliance certificate.
5. Occupy the dwelling as your sole or main residence for three years, or the exemption is clawed back.

Miss any of the first three and the exemption can be lost entirely, with the full levy becoming payable and a surcharge on top. Starting work before the commencement notice is acknowledged is the single most common error, and authorities have limited discretion to forgive it.

Biodiversity net gain has its own self-build exemption, covering development of no more than nine dwellings on a site of no more than half a hectare that is wholly self build or custom build. Where it does not apply, the biodiversity gain condition is a pre commencement condition and the gain plan must be approved before you start. A biodiversity net gain assessment is the document that supports that, and the metric behind it is work for a competent person.

Building regulations, warranties and lending

Planning permission and building regulations approval are separate consents with separate processes, and a self-build mortgage adds a third set of requirements.

Lenders releasing stage payments normally require a structural warranty or a professional consultant's certificate, and they set the stages at which money is released. The warranty provider inspects at defined points, so the inspection regime has to be arranged before work starts rather than retrofitted.

The VAT position is worth taking advice on early. A new dwelling built by a private individual may allow a reclaim of value added tax on eligible materials through HMRC's scheme for do it yourself housebuilders, and the claim window and the evidence requirements are set by HMRC and have changed in recent years. Check the current rules at the outset and keep every invoice in the required form.

Utilities, access and boundaries

This is where programmes slip. Electricity, water, waste water and telecoms connections all have lead times measured in months rather than weeks, and the quotation process is sequential: application, design, quotation, acceptance, payment, scheduling, work.

Do four things at the point of purchase. Confirm exactly where each service terminates and whether the connection is to the plot boundary or somewhere else. Get written confirmation of the adoption status of the estate road and drainage, because an unadopted road with an incomplete section 38 agreement can leave you dependent on the promoter. Obtain the title plan and check it against what is on the ground, particularly boundary positions and any right of way across the plot. And identify any trees on or near the boundary that are protected.

An illustrative example of a programme built properly: plot reserved in October, reserved matters submitted in November with the design code compliance schedule, approval in January, utility applications lodged in January rather than after approval, pre commencement conditions discharged in February and March, levy paperwork filed and acknowledged in March, start on site in April. The utility applications going in early is what made April possible.

Where self-builders lose the most time

Six recurring causes, in rough order of frequency.

Utility lead times, started too late. Pre commencement conditions discovered after exchange. The levy exemption sequence, broken by an early start. Ecological survey seasons, where a survey can only be done between spring and late summer. Party wall matters on a plot with a shared boundary. And design code departures that turn a straightforward reserved matters approval into a contested application.

None of those are planning arguments. They are programme management, and they are the difference between a build that starts in the spring and one that starts the following year.

A planning statement for a reserved matters application can be short, and it should state the outline permission reference, take each reserved matter in turn, and demonstrate compliance with the design code parameter by parameter. Officers determining plot applications on a serviced site read a great many of these, and the ones that cross reference cleanly get decided fastest.

This is general guidance rather than legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

Enter your postcode on PlanScope to see which reports your plot is likely to need, then start the utility applications the same week.

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