Reading capacity responses in a utilities assessment
The correspondence from each undertaker is the assessment. A positive point of connection offer often hides a reinforcement lead time longer than the permission.
Utilities assessment capacity responses are the whole document. Everything else is framing. The assessment exists to show a case officer, and the consultees behind them, that the scheme can be served with electricity, water, foul drainage, gas and telecommunications, and to show where the programme risk sits. The evidence is the correspondence from each undertaker, and reading it properly is the skill, because a point of connection offer that looks positive often contains a reinforcement requirement with a lead time longer than the permission.
Commission the enquiries early. On a 200-home site the electricity response is frequently the thing that fixes the start date, not the planning decision.
What the assessment is for at planning stage
A Utilities Assessment at application stage is not a design document. It answers four questions.
Can each utility be provided to serve the proposed development. Where is the connection point and what route does the service take. What network reinforcement or diversion is needed, and who pays for it. And what does that mean for phasing and the delivery programme.
That is narrower than a full utilities strategy, which comes later and includes detailed loads, substation sizing and adoption agreements. The planning document needs enough to show deliverability without pretending to certainty the undertakers have not given.
Separate documents deal with water supply and foul drainage capacity in detail, so keep them distinct. A Water Supply Assessment and a Foul Sewage Assessment each have their own structure and their own consultee, and merging all three into one utilities document produces a report none of them can answer cleanly.
Making enquiries to each undertaker and what to ask
Send five enquiries and send them on the same day, because they run at different speeds and the slowest sets the critical path.
- Electricity distribution network operator: a point of connection enquiry with the estimated maximum demand in kilovolt-amperes, the proposed phasing and the site plan.
- Gas transporter: a point of connection enquiry with the load and the phasing, noting that many schemes now propose no gas connection at all, which should be stated rather than left ambiguous.
- Water undertaker: a developer enquiry covering both the water supply point of connection and the foul and surface water position.
- Telecommunications provider: a network enquiry confirming whether a gigabit-capable network is available to the site, since new dwellings carry a connection requirement under the Building Regulations.
- Highway authority and any third-party asset owner: confirmation of apparatus in the highway and any constraints on street works.
Ask three things in every enquiry that applicants usually omit. State the phasing, so the response tells you the capacity available at each stage rather than for the whole site at once. Ask for the validity period of any estimate. And ask whether the response is a budget estimate or a formal offer, because the two mean different things and officers cannot be expected to know which they are reading.
Reading a point of connection offer
An electricity response typically has four parts, and each needs a different reaction.
| Part of the response | What it tells you | What to do with it |
|---|---|---|
| Point of connection | Where the network can accept the load | Check the route from there to the site and who owns the land it crosses |
| Sole-use assets | Substations, cables and switchgear serving only this scheme | Cost and programme are yours; identify substation sites on the layout now |
| Reinforcement requirement | Works needed on the wider network | Establish the lead time, which is the real risk |
| Charges and validity | What is payable and for how long the figure holds | Diarise the expiry and note it in the assessment |
Two points are easy to misread. A response saying capacity is available does not mean available today at the point you want it, and a response identifying a reinforcement scheme does not necessarily mean the developer pays for it. Ofgem's reforms to connection charging, which took effect in 2023, moved much of the cost of wider network reinforcement away from the connecting customer. The detail varies by operator and by voltage, so ask the operator to confirm the position for this connection rather than assuming either way.
The sole-use assets are where layout decisions get made. A substation needs a site with vehicular access, clearances and usually a position near the site boundary. Finding that out after the layout is consented means a non-material amendment at best.
Reinforcement requirements and the programme risk
Reinforcement lead times are the single most underestimated item on a development programme. They are set by the operator's own works programme, by equipment delivery and, in some regions, by constraints further up the network.
Three practical responses are available. Ask whether a flexible or managed connection is offered, which trades a lower capacity at peak times for an earlier connection date and suits schemes with electric heating and vehicle charging that can be managed. Ask whether the load can be reduced by design, since heat pump selection, diversity assumptions and charging strategy all move the maximum demand figure. And phase the connection so the first parcels are served from existing capacity while reinforcement proceeds.
Say all of this in the assessment. An authority reading a candid account of a reinforcement lead time and a phasing response is more comfortable than one reading a bare statement that capacity is available.
Diversions and the land they need
Apparatus crossing a site is a constraint on the layout before it is a cost. Overhead lines, underground cables, gas mains, water mains and public sewers all carry easements or statutory protection, and building over them is not an option.
The sequence is: identify every asset from the undertakers' records and a site survey, establish the easement width for each, plot them on the constraints plan, then decide for each whether to design around it or divert it.
Diversions need three things that take time: a technical design by the undertaker, a cost agreement, and land rights for the new route including any third-party consents. The new easement often lands somewhere the layout had allocated to housing, which is why diversions should be settled before the layout is fixed rather than after.
Public sewers deserve particular care. There is a right to connect to a public sewer under the Water Industry Act 1991, and there are grounds on which an undertaker may resist a connection that would prejudice its system. Build-over agreements and diversions are separate processes with their own timescales.
Phasing the scheme around connection dates
Build a single table with one row per utility and one column per phase, showing the connection date assumed, the capacity available and the works required before it. That table is more use to a case officer than any amount of prose, and it is what a planning condition about phasing should be written against.
Where a phase depends on reinforcement, say which phase and what the contingency is. Where a phase can proceed on existing capacity, say how much is left for the next one.
The companion discipline is to keep the energy strategy and the utilities position consistent. A scheme with an all-electric heating strategy has a much higher electrical demand than a gas scheme of the same size, and an energy statement that assumes heat pumps alongside a utilities assessment that quotes a gas-era load will be picked up.
Presenting the position without overstating certainty
Write the assessment so that every statement is traceable to a document in the appendix. The pattern that works: state what was asked, quote the operative part of the response, give its date and reference, then say what it means for the scheme.
Three phrases to avoid, because they overstate what undertakers actually say: capacity is confirmed, the connection is agreed, and no reinforcement is required. What undertakers give at this stage is an indication based on current network conditions, usually with a validity period and a caveat. Reproduce the caveat.
Where a response is unhelpful or has not arrived, say so with the enquiry date and the reference. An honest gap with a chase record is treated far better than a confident assertion a consultee then contradicts. The broader evidence base for residential schemes is set out in the guide to utilities capacity evidence for a residential scheme.
You can see where the utilities, water and drainage documents sit alongside each other in the full report index.
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.
Frequently asked questions
What should a point of connection enquiry include?
The estimated maximum demand, the proposed phasing and a site plan. Ask explicitly for the capacity available at each phase rather than for the whole site at once, for the validity period of any figure given, and for confirmation of whether the response is a budget estimate or a formal connection offer.
Who pays for network reinforcement?
Less of it falls on the developer than it used to. Ofgem's reforms to connection charging, effective in 2023, moved much of the cost of wider network reinforcement away from the connecting customer. The detail varies by operator and by voltage, so ask the network operator to confirm the position for the specific connection rather than assuming.
What is the usual programme risk in a utilities response?
Reinforcement lead times, which are set by the operator's works programme, equipment delivery and in some regions by constraints further up the network. Options include a flexible or managed connection with an earlier date, reducing the load through design, or phasing so early parcels use existing capacity while reinforcement proceeds.
How should apparatus crossing the site be handled?
Identify every asset from undertakers' records and a site survey, establish the easement width for each, plot them on the constraints plan, then decide whether to design around or divert. Diversions need a technical design, a cost agreement and land rights for the new route, and the new easement often lands on developable area.
What wording should the assessment avoid?
Capacity is confirmed, the connection is agreed and no reinforcement is required. Undertakers give an indication based on current network conditions, usually with a validity period and a caveat, so reproduce the caveat. Make every statement traceable to a dated document in the appendix, and record chases where a response has not arrived.
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.