How planning costs recur when a scheme is phased
Each phase of a major scheme brings its own fees, its own levy notices and its own ageing surveys. The recurring costs are predictable, and most of them can be negotiated down at outline stage.
Phasing a scheme spreads your costs, and it also multiplies them. Every phase brings its own reserved matters fee, its own condition discharge fees, its own set of surveys that have aged since the outline application, and its own trigger points in the section 106 agreement. Developers budget the outline application and the first phase carefully, then discover in year four that phase three needs a fresh ecology baseline, a re-run transport model and a discharge fee schedule nobody priced.
The pattern is predictable enough to plan for. What follows is where the money actually recurs on a phased major scheme in England.
What a phasing condition commits you to
A phasing condition normally requires a phasing plan to be approved before development begins, and then requires development to proceed in accordance with it.
That sounds administrative. It is not. Once approved, the phasing plan becomes the thing your obligations hang off, and changing it later means a fresh application to vary the condition under section 73 of the Town and Country Planning Act 1990, with a fee, a consultation period and the risk that the authority revisits matters you thought were settled. Where a phase boundary moves, the levy calculation, the affordable housing tenure split across phases and the infrastructure triggers may all move with it.
Write the phasing plan with more flexibility than you think you need. Phase boundaries described by reference to a drawing with defined parcels, plus a mechanism to sub-phase within a parcel by written agreement, saves a section 73 application later. Authorities usually accept sub-phasing if the total obligations do not change.
Reserved matters fees on each phase
An outline permission is followed by reserved matters submissions, and the fee is not a single payment split across phases.
Each reserved matters application attracts a fee calculated on the scale in the fee regulations, subject to the maximum that applies to applications of that type. Submit reserved matters for five phases and you pay five times, not once. The figures are indexed annually on 1 April, so check the current fee schedule on the Planning Portal rather than the figure you used on the last scheme.
Condition discharge fees stack the same way. Each application to discharge conditions carries a per-request fee, and a phased scheme typically makes several discharge applications per phase: drainage details, materials, landscaping, ecology mitigation, construction management, external lighting. A scheme with six phases and six discharge applications per phase is making thirty-six paid submissions over its life. The unit cost is small. The total is not, and the officer time it consumes on your side is usually the larger number, as the piece on what a householder planning application really costs shows at the other end of the scale.
Surveys that expire between phases
This is where phased schemes bleed money, because survey validity is measured in years and phases are measured in decades.
| Evidence | Usual shelf life | What forces an update |
|---|---|---|
| Ecology baseline and protected species surveys | 1 to 3 years | Seasonal windows, habitat change, changed legislation |
| Biodiversity net gain baseline | Tied to the approved gain plan | Change to the parcel, metric version updates |
| Tree survey to BS 5837:2012 | Around 2 years | Growth, removals, storm damage |
| Transport assessment and trip generation | 3 to 5 years | New development nearby, changed highway layout |
| Flood risk assessment | Varies | Updated flood mapping, revised climate change allowances |
| Contamination investigation | Varies by ground conditions | New information, changed end use |
Ecology is the most expensive to re-run, and the most likely to delay. Bat emergence surveys sit in a May to September window with the best results from May to August. Great crested newt eDNA sampling runs from 15 April to 30 June. Miss a season and the phase waits a year, whatever the build programme says. Programme the ecology re-baseline eighteen months before you need the permission, not three months.
Climate change allowances are the flood equivalent. The Environment Agency updates its allowances, and a drainage strategy designed to an older allowance may not discharge a condition on a later phase. Check the current allowances at the point each phase is designed rather than assuming the outline evidence still holds.
Levy instalments across phases
The Community Infrastructure Levy is calculated per chargeable development, and on a phased permission each phase is usually treated as a separate chargeable development. That is helpful, because it means liability arises when each phase starts on site rather than all at once.
It also means the paperwork repeats. An assumption of liability notice and a commencement notice for each phase. A liability notice issued by the authority for each phase. Any relief claims, including self-build or social housing relief, made and evidenced separately for each phase, before commencement of that phase.
The trap is the indexation. CIL rates are index-linked, so a later phase is charged at the index figure applying when that phase's liability notice is issued, not the figure that applied at outline stage. On a ten-year scheme that difference is material to viability, and it is one of the numbers most often omitted from the appraisal. The mechanics of the calculation itself are set out in the piece on how a CIL charge is calculated on a new dwelling, and the penalties for procedural slips in the piece on CIL surcharges. Those surcharges are the single most avoidable cost on a phased site, because they follow from missing a notice rather than from anything about the development.
Obligation triggers tied to phases
Section 106 agreements on phased schemes tie payments and works to triggers: occupation of the twentieth dwelling in a phase, commencement of a phase, practical completion of a spine road.
Two problems recur. First, triggers drafted against the original phasing plan stop making sense when the phasing changes, and a deed of variation costs legal fees on both sides plus the authority's monitoring charge. Second, front-loaded triggers hurt cash flow: a contribution payable on commencement of phase one for a school expansion serving the whole scheme is money out before revenue is in.
Negotiate triggers by proportion rather than by named phase where you can. An obligation expressed as a payment per dwelling on occupation survives a phasing change intact. An obligation expressed as a lump sum on commencement of phase two does not.
Monitoring fees also recur. Many authorities charge an annual or per-trigger monitoring fee for the life of the agreement, which on a fifteen-year scheme is a cost line in its own right.
Rebasing evidence for a later phase
At some point a later phase is being designed against a policy background that has changed. The local plan has been replaced, national policy has been re-issued, and biodiversity net gain, fire safety or energy requirements have moved.
An outline permission fixes the principle of development, and reserved matters cannot be refused on grounds that go behind that principle. But the detail is still assessed against current policy, and where a condition requires details to be approved, the authority applies the requirements in force when it considers them. That is why a phase-five energy strategy may need to meet a standard the outline never anticipated.
Budget a rebasing exercise for any phase starting more than about five years after the outline consent: a policy review, updated technical evidence, and a revised Planning Statement section explaining how the phase sits against the current framework. It is cheaper than arguing about it at committee.
Writing phasing into the application
Do this work at outline stage, while the authority still wants something from you.
- Propose your own phasing plan rather than accepting a condition requiring one later.
- Ask for sub-phasing by written agreement within each parcel.
- Express obligations per unit or per square metre rather than per phase where possible.
- Seek longer implementation periods for reserved matters on later phases, and state the reason.
- Agree in writing which surveys the authority will accept as still valid at each reserved matters stage, and on what updating basis.
- Model the levy with indexation applied to each phase separately in the viability appraisal.
The fifth point is the one people skip, and it is the one that saves most. An authority that has agreed in principle that a desk-based update plus a walkover will refresh an ecology baseline is much harder to move later than one asked cold in year six.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it, and confirm current fees and levy rates against the published schedules.
See PlanScope pricing if you are costing repeat report drafting across several phases rather than commissioning each one from scratch.
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 pay a reserved matters fee for every phase?
Yes. Each reserved matters application attracts its own fee under the fee regulations, subject to the maximum for that application type. A scheme submitted in five phases pays five times. Condition discharge applications work the same way, with a fee per request, so a phased scheme can make dozens of paid submissions across its life.
How long do ecology surveys stay valid on a phased scheme?
Most local planning authorities treat protected species survey data as current for one to three years, depending on the species and how much the habitat has changed. Because survey windows are seasonal, a lapsed baseline can delay a phase by a full year. Programme any re-baseline around eighteen months ahead of the permission you need.
Is CIL charged once or per phase?
On a phased permission each phase is normally a separate chargeable development, so liability arises as each phase starts on site. That helps cash flow, but it means separate assumption of liability and commencement notices per phase, and each phase is charged at the index figure applying when its liability notice is issued.
Can I change the phasing plan after approval?
Usually only by applying to vary the relevant condition under section 73, which costs a fee and reopens consultation. Building sub-phasing flexibility into the original phasing plan avoids this. Ask for a mechanism that lets you sub-divide an approved parcel by written agreement with the authority rather than by fresh application.
Does a later phase have to meet current policy?
The principle of development is fixed by the outline permission and cannot be revisited at reserved matters. The detail is different. Where details are submitted for approval, the authority applies the requirements in force at that time, so later phases can face energy, biodiversity or fire standards that did not exist at outline stage.
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.