Competence for a utilities assessment

Who writes a utilities assessment is less important than who is allowed to approve what it recommends. No licence or competent person regime governs the document itself. But every meaningful conclusion in it depends on a response from an asset owner, and any diversion or new connection it proposes has to be designed to that owner's standards and approved by them. A consultant who understands that boundary produces a useful report. One who does not produces a set of assumptions that collapse at detailed design.

For a self-builder or a small developer, the practical question is usually narrower: who do I pay, and what should they come back with?

What the assessment has to establish

Five answers, in writing, with references.

• Where the existing apparatus is, for electricity, gas, water, foul and surface water drainage and telecoms, from the asset owners' own records rather than from a desktop guess.
• Whether there is capacity at the proposed connection point for the load or flow the development will add.
• What reinforcement or diversion is needed, and who has to carry it out.
• What it will cost, distinguishing the quoted elements from the estimated ones.
• How long it takes, with the dependencies on third parties identified.

A report that stops at the first point is an asset search, not an assessment. Asset records are the starting material: they are indicative, often inaccurate on depth and alignment, and need validating on site before anything is designed around them.

Reading a capacity response

Capacity responses are written in the asset owner's own vocabulary, and misreading them is where small schemes lose money.

For electricity, an early enquiry to the distribution network operator produces a budget estimate and a point of connection, not an offer. A formal application produces a connection offer with a defined scope, a price and an acceptance period. The offer will separate works the operator must do itself from works a competitive provider may carry out, and that split is where cost can be reduced. Where the scheme exports electricity, the generation connection follows a separate engineering recommendation depending on the size of the installation.

For water, the undertaker's response distinguishes a service connection from a requisition for a new main, which is a different legal mechanism under the Water Industry Act 1991 and a different cost base. For foul drainage, there is a right to connect to a public sewer under section 106 of that Act, subject to the undertaker's conditions on the manner of the connection, which is not the same as a right to discharge whatever flow you like.

The phrases to look for in any response are capacity subject to, conditional on reinforcement, and indicative only. Each one means the answer is not yet an answer.

Who is competent to do the work

There is no protected title. In practice the work is done by one of three types of consultant, and they are not interchangeable.

For a single dwelling or a small infill scheme, a civil engineer handling drainage plus direct enquiries to the network operators is usually enough. For anything with a high voltage requirement, a diversion, or a constrained route across third party land, a utilities consultant earns their fee in the commercial handling of the connection offers alone.

Whoever does it, insist that the report names its author and is dated, because an undated utilities report is almost worthless. Capacity changes as other developments connect, and why a planning report needs a named author and a date applies with particular force here.

Diversions and the asset owner's approval

This is the part the brief above all needs to be clear about. A consultant can prepare a diversion design, but the asset owner approves it, sets the standards it has to meet, and in many cases carries out the work itself.

For electricity and gas, diversion of live apparatus is almost always carried out by the owner or its approved contractor, with the developer paying. The design has to satisfy the owner's technical standards on depth, separation, bedding, protection and access. Expect a quotation, an acceptance window, and a programme the owner sets.

For water and sewerage, diverting a public sewer requires the undertaker's agreement, and building over or close to one requires a build-over agreement with its own conditions on construction method and future access. Abandoning or disconnecting apparatus needs agreement too.

Two further permissions sit alongside the technical approval. Works in the public highway by anyone other than a statutory undertaker need a street works licence under the New Roads and Street Works Act 1991. And apparatus crossing third party land needs a wayleave or easement, which is a legal transaction, not an engineering one.

Where a planning consultant has to stop

A planning consultant can tell you what the authority will expect to see and can draft the narrative. They should not be the source of the technical conclusions.

So treat the following as outside a planning consultant's remit unless they happen to hold the relevant engineering background: whether capacity exists, what reinforcement costs, how long a connection takes, whether a diversion is feasible on a given alignment, and whether a proposed route can be secured in law. Those answers come from the asset owners and from an engineer who has read their responses.

The honest version of this in a report reads: the distribution network operator's response dated and referenced confirms a point of connection at a stated location subject to reinforcement, the cost of which is quoted at a stated figure valid for a stated period. Not: capacity is expected to be available.

Where a report has been commissioned and arrives without that evidential chain, it is worth knowing what redress exists when a consultant's report fails validation before paying the final invoice.

Programme, and the items with long lead times

Utilities are a programme risk more often than a cost risk, and the assessment should say so plainly.

1. Enquiry and budget estimate: weeks.
2. Formal application and connection offer: longer, and the offer has an expiry date.
3. Reinforcement works: months, sometimes into the following financial year where the operator has to programme them.
4. Diversion of live apparatus: months, and often dependent on a planned outage window.
5. Highway works: subject to permit conditions, coordination with other works and seasonal embargoes.

Transformers and switchgear have had long lead times across the industry, so for any scheme needing a substation, the order date rather than the connection date is the one to track. Accept the connection offer early where the cost is known, because acceptance is often what triggers the operator to programme the work.

New buildings also need in-building infrastructure for high-speed electronic communications under Approved Document R, and a connection should be requested from a network operator early even though it rarely sits on the critical path.

Coordinating with the drainage strategy

Foul and surface water drainage appear in both the utilities assessment and the drainage strategy, and the two documents disagreeing is a common validation problem.

Decide which document owns which question. The drainage strategy should own discharge rates, attenuation, treatment and exceedance. The utilities assessment should own the connection point, the capacity response, the adoption route for new sewers and any build-over or diversion agreement. Both should cite the same undertaker response, by date and reference.

Where the site has no public sewer, the question moves to private treatment and the hierarchy in national guidance, which is the territory of a foul sewage assessment rather than a utilities report. Say which document deals with it so the officer is not left guessing.

PlanScope can structure a utilities assessment around the responses you have obtained and flags the inputs it does not hold with a clear marker. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required.