Construction supply specialists

Temporary Builder's Supply Connections

Power on site from day one. We manage temporary supply applications, specify the correct capacity, and coordinate the transition to permanent supply.

Fast turnaround Correct specification Transition managed
The Process
1
Assess site power demand
2
Submit DNO application
3
Temporary supply installed
4
Transition to permanent
From Application to Live Power

The Process Step by Step

Every temporary supply engagement follows a clear, managed sequence. Here is exactly what happens at each stage.

1

Getting the Specification Right

The most common and costly mistake with temporary supplies is undersizing. A minimum three-phase 63A supply is the starting point for most residential construction sites. Sites with tower cranes, concrete pumps, large hoists, or heavy plant running simultaneously will need significantly more. Getting the specification wrong means an abortive DNO visit, a programme delay, and additional cost to uprate. USP assesses the actual site power demand before submitting the application.

2

Lead Times and Programme

A straightforward LV temporary supply typically takes 4 to 12 weeks from application to energisation. Supplies that require highway excavation, traffic management, or works to existing DNO assets take longer. USP factors the temporary supply lead time into your overall programme from the outset and submits the application in parallel with the permanent connection application to avoid sequential delays on the critical path.

3

Generator as an Alternative

Where DNO lead times are long, site access is difficult, or the programme duration is short, a diesel or HVO generator may be the better option. Generator hire typically costs £200 to £500 per week including fuel, depending on size. For short programmes or remote sites, this can be more economical than a grid connection. USP can advise on generator sizing, hybrid grid-generator solutions, and the crossover point at which a grid connection becomes more economic.

4

Transition to Permanent Supply

The transition from temporary to permanent supply requires careful coordination. USP manages the sequencing of permanent energisation and temporary disconnection to minimise interruption to the site. Show homes and sales suites must be energised from the permanent supply before the temporary is removed. Where plot completions are occurring, the transition must not cut power to occupied or near-complete properties. USP plans the transition as part of the overall energisation programme.

Key Technical Considerations

Technical Specifications

The critical parameters that govern every temporary builders supply.

Supply type
Almost always LV. Single-phase 230V for very small sites. Three-phase 400V for most residential and commercial construction.
Typical capacity
Minimum three-phase 63A (approximately 44kVA) for residential sites. Higher for sites with cranes, pumps, or heavy plant.
Provider
DNO non-contestable activity. Not deliverable by an ICP. USP manages the application and transition coordination.
Lead time
4 to 12 weeks for a straightforward LV supply. Allow more for supplies requiring highway works or network reinforcement.
Billing
Metered by your chosen electricity supplier. The temporary supply meter is separate from the permanent development meters.
Generator alternative
£200 to £500 per week hire cost. Viable for remote sites, short programmes, or where DNO lead times are prohibitive.
Why Choose USP

What USP Can Do For You

Temporary supply coordination as part of your complete electricity connection package.

We coordinate temporary supply applications with your overall programme, applying in parallel with permanent works to avoid sequential delays.
We specify the correct supply size for your site requirements at the outset, avoiding undersizing, abortive visits, and costly uprates.
We advise on the economics of generator versus grid connection for your specific site, programme, and DNO lead time.
We manage the transition from temporary to permanent supply, coordinating energisation and disconnection to minimise site disruption.
We plan show home and sales suite power requirements early, ensuring they are energised from the permanent supply before the temporary is removed.
Certified Provider

Fully Accredited & Committed to Safety

Every electricity connection we deliver meets the highest industry standards. Worker safety, public safety, environmental responsibility, and project compliance from planning to sign-off.

WaterSafe accredited
WIAPS accredited
LRQA WIRS certified
LRQA NERS certified
LRQA GIRS certified
ISO 9001 certified
Achilles UVDB Silver Plus
Constructionline member
SSIP accredited
Acclaim accredited
What Our Clients Say About Us

Rated 5.0 ★★★★★

50 Google Reviews

Temporary Supply FAQs

Frequently Asked Questions

As early as possible. Lead times for a straightforward LV temporary supply are typically 4 to 12 weeks from application to installation. If the supply involves any highway works or reinforcement, it can take longer. USP recommends applying for the temporary supply in parallel with your permanent connection application so that the two do not sit sequentially on the programme.
No. Temporary builders supplies are a non-contestable DNO activity. Only the distribution network operator can install and energise a temporary supply connection. USP manages the DNO application on your behalf, specifies the correct supply, and coordinates the installation as part of the overall programme, but the physical connection is made by the DNO.
For most residential sites, a minimum three-phase 63A supply (approximately 44kVA) is the starting point. If you have tower cranes, large hoists, concrete pumps, or multiple trades running simultaneously, you will need more. Undersizing the supply leads to tripped breakers, programme delays, and an abortive DNO visit to uprate. USP assesses site power requirements at the outset to ensure the correct specification.
It depends on the programme duration, site location, and DNO lead time. A diesel or HVO generator typically costs £200 to £500 per week to hire and run, plus fuel. If the DNO lead time means the site will be live for 6 months or more before a grid connection can be installed, a generator may be viable. For sites with long programmes and straightforward DNO access, a grid temporary supply is almost always more economical. USP can advise on the economics for your specific situation.
The temporary and permanent supplies are separate connections. The temporary supply is removed when the permanent supply is ready. USP coordinates the transition, ensuring the permanent energisation and the temporary disconnection are managed together to minimise interruption to the site. Show homes and sales suites should be on the permanent supply before the temporary is removed.
Get Started

Need Temporary Power
on Your Construction Site?

Tell us about your project and we will advise on temporary supply specification and lead times within 24 hours.

100% free, no obligation Response within 24 hours 5.0 from 50 Google reviews

Prefer to talk? Call 024 7542 6505 for immediate service.

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