Two industrial electrical quotes can look similar and still price different jobs. One may allow for a single planned visit; another for phased working, supplier attendance and commissioning support. A lower total is not automatically a weaker offer, and a longer proposal is not automatically more complete.
If you already have written proposals for a factory, quarry or larger operational site, compare the outcome and assumptions before the price. Establish what each contractor will deliver, what the site must provide and what remains uncertain before placing an order.
Confirm that each proposal is pricing the same outcome
Start with the end result rather than a list of equipment. Does the industrial electrical scope of work cover only a supply to a defined connection point, or a wider installation with controls integration and commissioning support?
A simple scope comparison
For example, a factory electrical upgrade quote could end at a local isolator, leaving the plant supplier to make the final connection. Another could include that connection and attendance during start-up. Neither boundary is necessarily wrong; they are not the same offer.
Ask contractors to identify included equipment, work areas and completion criteria against the same brief or drawing revision. Where equipment differs, clarify whether it is an equivalent alternative or changes the required outcome.
Check the survey basis, site information and assumptions
An industrial electrical quotation based on a site survey may still contain assumptions about existing equipment or inaccessible areas. A proposal prepared from drawings alone may be useful, but its basis needs to be clear.
Check which drawings, equipment details and survey findings were used, what could not be verified, and whether further investigation is included. Ask which findings could change the design, cost or programme. Check that relevant conditions, such as dust, moisture or restricted access, are reflected in the proposal.
If a price is subject to further survey, ask when that survey will happen and whether you can review the final scope and cost before authorising the main works.
Compare programme, access and operational-disruption allowances
Compare the working arrangements priced, not just the proposed start date. Does each offer assume the same access hours, shutdown windows, number of visits and availability of plant suppliers?
One continuous visit is a different commercial assumption from several return visits around production. Check allowances for access equipment, inductions, agreed isolation arrangements and waiting time. Identify dependencies such as equipment delivery or another contractor finishing first, and distinguish provisional dates from confirmed commitments.
Ask what happens commercially if agreed access is unavailable or a supplier is not ready. A proposal can include a realistic duration without including the cost of repeated mobilisation or extended attendance.
Clarify boundaries between electrical work, plant suppliers and other trades
Write down who is supplying, installing, connecting, configuring and proving each part of the project. The fixed installation, machinery, controls and mechanical or process work may sit with different parties.
Check who coordinates those interfaces and whether supplier attendance or specialist input is included, separately charged or client-arranged. An electrical supply being complete does not by itself show that a production machine has been commissioned.
Client-supplied equipment also needs a clear boundary: who checks the supplier specifications, who deals with missing parts or a mismatch, and what attendance is priced? Resolve gaps with the relevant supplier rather than expecting the electrical quotation to cover them by implication.
Appointing an electrical contractor does not transfer the site operator’s own duties. The proposal should make the agreed division of work visible.
Check testing, commissioning and handover deliverables
Inspection, testing, certification and commissioning evidence depend on the work agreed. Ask each bidder to describe the deliverables relevant to its scope, rather than assuming that “testing included” means the same thing.
Possible items include appropriate installation certificates and test results, updated drawings or circuit schedules, and records of agreed functional checks. Not every item applies to every job. Clarify any electrical certification before ordering, including what work it will cover.
Where work equipment’s safety depends on installation conditions, HSE says inspection is needed after installation and before first use. If that applies, establish who will undertake it and provide evidence. This is not a blanket inspection package for every electrical project.
Agree how outstanding items will be recorded and closed out, and how acceptance relates to installation completion, commissioning and document handover. This makes it easier to compare when each proposal considers its work finished.
Review exclusions, provisional allowances and variation arrangements
Read exclusions alongside the total. Access hire, builders’ work, specialist attendance or out-of-hours working may be excluded, included or covered by an allowance. An exclusion can be reasonable when everyone understands who is covering it.
For each provisional allowance, ask what it covers, what remains uncertain and how the final amount will be established. Separate optional upgrades from the work needed for the agreed outcome.
Check VAT treatment, quotation validity, payment stages and the process for agreeing changes. Ask how a variation will be described, priced and authorised, including its programme effect, before additional work proceeds. Keep any client-arranged costs visible in your comparison too.
Match contractor competence to the defined work
Price and scope are only part of the decision. Ask for evidence of competence relevant to the actual installation, controls or site conditions, rather than relying on a general description of electrical services.
For specialist elements, establish whether the bidder will do the work directly or use another provider, and who remains your point of coordination.
HSE’s guidance on using contractors recommends defining the job, selecting a suitable contractor, sharing relevant information and managing the work. Competence checks should be proportionate to the work’s risk and complexity.
The Electricity at Work Regulations 1989 provide the legal context for electrical safety and competence, not a mandatory quotation format. This checklist supports a commercial decision; it does not replace project-specific safety arrangements.
Use targeted clarifications to make the comparison like for like
Make a comparison sheet with one entry for each issue and each contractor. Mark it included, excluded, provisional or unclear. Do not treat silence as confirmation.
Send each bidder the same updated information. Use revision dates or references so an old price is not accidentally compared with a newer offer. Prioritise clarifications that affect the decision:
- Confirm the exact scope boundary and the documents used to price it.
- Request written clarification of assumptions that could change cost or completion.
- Identify who covers supplier attendance, commissioning interfaces and handover evidence.
- Have agreed clarifications incorporated into a revised proposal or clearly identified order documents.
Once those points are clear, you can compare industrial electrical quotes on a like-for-like basis. Similar scopes may still attract different prices; assess those prices alongside relevant competence, delivery commitments and the costs your site will retain.
Discuss your industrial project
Maenporth Electrical Ltd is based at Maenporth and serves Falmouth, Penryn and wider Cornwall. For industrial electrical services, call 01326 250297 to discuss the scope, assumptions and handover requirements for your site.