Specialising in solar and renewable energy systems. From 3kW domestic installations to 1MW+ commercial projects. BS7671:2018 compliant designs with 24–96 hour turnaround.
Every deliverable is BS7671:2018 compliant, installation-ready, and produced by a designer with 20 years of hands-on industry experience.
POC and PV SLDs in Armtech format. Clear, installation-ready drawings.
Full BS7671 cable sizing with voltage drop analysis and correction factors.
G100 methodology reports for DNO applications and grid connection approval.
Coordination reports with CPD settings for protective device operation.
Distribution board and switchboard schedules with custom panel designs.
Earthing system design and safe isolation procedure documentation.
Complete BOM with specified components, quantities, and references.
Shutdown and re-energisation documentation for safe working practices.
Independent feasibility studies and compliance verification service.
A full-time electrical designer costs far more than their salary. With ZESTEC, you only pay for designs you actually need.
No long-term commitment. Hours scale with your workload. Cancel with 30 days' notice.
All prices exclude VAT. Terms and conditions apply.
All design work: SLDs, cable calculations, G100 reports, DB schedules, and any other design deliverables. Briefing calls, revisions, and basic queries don't count against your hours.
Additional hours beyond your retainer are available at a slightly higher rate. Growth and Scale tier clients receive a discounted overflow rate.
Yes, unused hours roll over for one month. They don't roll further than that.
Yes. All retainers can be cancelled with 30 days' written notice. No exit fees or penalties.
Both options are available. Retainers make sense when you need regular design support and want priority turnaround and better rates.
Book a free call to discuss which option suits your workload, or send us a brief for your next project.