Self-build plot provision on larger residential sites
Serviced plot has a statutory meaning, and plots that miss it do not count. Here is the specification, the marketing period, the reversion mechanism and the section 106 drafting.
Where a local plan requires serviced self-build plots on larger residential sites, the obligation is not satisfied by marking a few corners of the layout "self-build" on a plan. A serviced plot has a statutory meaning under the Self-build and Custom Housebuilding Act 2015: access to a public highway and connections for electricity, water and waste water, or the ability to be provided with them within a specified period. Plots that fail that definition do not count towards the authority's duty, and a section 106 obligation drafted loosely will be tested against it.
So the useful questions for a developer are what the plot specification has to include, how long the plots must be marketed, what happens if nobody buys them, and how the obligation is secured.
The duty on councils to keep a register
Relevant authorities must keep a register of individuals and associations of individuals seeking to acquire serviced plots of land in their area to build homes to occupy as their sole or main residence. Many authorities operate a two-part register, with a local eligibility test applied to part one.
The register then drives a further duty. Authorities must have regard to the demand it shows and give suitable development permission for enough serviced plots to meet that demand within the compliance period following each base period. Base periods run annually from 31 October, and the first ran from 1 April 2016.
The Levelling-up and Regeneration Act 2023 strengthened the framework, including requirements around how authorities have regard to their registers in plan-making and decisions. The register numbers themselves are published by each authority, and they are the evidence base a policy requirement rests on. The duties side of this is covered in more detail in the guidance on self-build and custom build duties on larger sites.
How local plans turn that into a plot requirement
Policies vary, but a common formulation runs along these lines: on residential sites above a stated threshold, a percentage of the total dwellings must be provided as serviced plots for self-build or custom build, marketed for a specified period, and released to the developer if unsold at the end of it.
Check four things in the policy wording before pricing a site:
- the threshold at which the requirement bites, which may be expressed in dwellings or in site area
- the percentage, and whether it is rounded up or down
- the marketing period and who must carry out the marketing
- the reversion mechanism and whether it needs the authority's written agreement
The threshold is the number that matters most at acquisition. A policy applying at 100 dwellings changes the appraisal on a 104-unit scheme and not on a 96-unit one, and reducing a scheme to sit below a threshold attracts the scrutiny described in phasing a large scheme without gaming thresholds.
What a serviced plot has to include
The statutory definition is the floor, not the ceiling. Local policy and the section 106 often add to it, and officers will look for the following:
- A defined, registered plot boundary with a legal access from a road that is, or will become, publicly maintainable or covered by a management arrangement
- Live connections for electricity, water and foul drainage brought to the plot boundary, or secured by agreement with the undertakers within a stated period
- Surface water drainage provision, since the statutory definition does not mention it and a plot with no outfall is not buildable
- Telecoms and broadband ducting, which most authorities now expect
- A level, usable building platform with any site-wide remediation completed
- Confirmation that any site-wide planning conditions affecting the plot have been discharged
That last one is the trap. A plot sold to a self-builder who then discovers an undischarged pre-commencement condition covering the whole site cannot start, and the developer's obligation is unlikely to be treated as met.
Marketing periods before plots revert
The marketing obligation usually requires plots to be advertised for a period of around 12 months, at a price capable of being substantiated as reasonable, through channels that reach the authority's register.
Three practical points. First, write to the authority and ask that register members are notified, because a developer marketing privately and then claiming no interest will be challenged. Second, keep a documented record of enquiries, viewings and offers, since the reversion clause almost always requires evidence. Third, check whether the price has to be independently assessed, because a plot marketed at a figure nobody would pay is not marketed.
Reversion is not automatic in most agreements. It typically needs the authority's written confirmation that the marketing obligation has been discharged, and that confirmation takes time, so build it into the programme rather than assuming the plots free up on the anniversary.
Design codes for self-build parcels
Authorities grant permission for self-build parcels in two ways. Either outline permission for the parcel with reserved matters for each plot, or a plot passport approach where a design code sets parameters and individual plots come forward by a lighter route.
A workable code covers building lines and set-backs, maximum ridge and eaves heights, footprint envelope, materials palette with some latitude, parking and bin storage provision, boundary treatments and overlooking distances. It should be permissive enough that the self-builder gets a house they want, and specific enough that the authority is not re-running a design argument twelve times.
Over-prescription is the failure mode. A code mandating a single material and a fixed window rhythm produces plots that sit unsold, which then feeds back into the reversion argument and looks, to an officer, like marketing designed to fail.
Securing plots through section 106
The obligation normally sits in a section 106 agreement with these elements: identification of the plots on a plan, the servicing specification, the trigger for making plots available, the marketing period and method, record-keeping and reporting, the reversion mechanism, and a restriction preventing occupation of a stated number of market dwellings until the plots are serviced and available.
That last restriction is the one with teeth. Tie it to a sensible point in the build programme rather than to practical completion of the whole scheme, and make sure the drafting allows for phased delivery where the site is phased.
A monitoring fee will usually be sought alongside it. And where the plot requirement materially affects scheme economics, it is a cost to be tested through the viability evidence in the usual way, alongside affordable housing and the other obligations captured in an Affordable Housing Statement.
One honest uncertainty: self-build policies are newer than most local plan policies and the drafting quality varies widely. Where the wording is ambiguous, agree the interpretation with the authority in writing at pre-application stage, because a disagreement discovered during section 106 negotiation delays the whole consent.
A Planning Statement drafted on PlanScope can set out the self-build policy compliance section with the plot schedule, servicing specification and marketing proposals structured for the officer to check. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
Frequently asked questions
What makes a plot a serviced plot?
Under the Self-build and Custom Housebuilding Act 2015 it needs access to a public highway and connections for electricity, water and waste water, or the ability to be provided with them within a specified period. Policy and the section 106 usually add surface water drainage, telecoms ducting and a usable building platform, none of which the statutory definition mentions.
How long do self-build plots have to be marketed?
Commonly around 12 months, at a price capable of being shown to be reasonable, through channels that reach the authority's register. Ask the council to notify register members directly, keep a documented record of enquiries and offers, and check whether the asking price has to be independently assessed before marketing starts.
What happens if nobody buys the plots?
Most agreements allow the plots to revert to the developer for market housing, but reversion is rarely automatic. It usually requires the authority's written confirmation that the marketing obligation has been discharged, supported by the marketing records. That confirmation takes time, so programme it rather than assuming the plots free up on the anniversary.
Can a self-build obligation be reduced on viability grounds?
It is a cost like any other obligation and can be tested through viability evidence alongside affordable housing, section 106 contributions and the levy. Whether it is reduced depends on the policy wording and the strength of the appraisal, and authorities tend to protect the plot requirement where the register shows substantial local demand.
How much design control should the plot passport impose?
Enough to avoid re-running a design argument on every plot, and no more. Building lines, height limits, footprint envelope, a materials palette with latitude, parking and boundary treatments are usually sufficient. Over-prescription produces plots that sit unsold, which weakens any later argument that the marketing obligation was properly attempted.
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.