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Independent electrical design, specification, and consultancy for self-builders. We create the roadmap; our approved partners build it.
What you see above is not a static diagram. It represents the live automation logic we engineer into every Octopus Agile-optimised home — a 3-phase symphony of solar generation, battery storage, heat pump scheduling, and EV charging, all orchestrated to buy low, store smart, and export high. This is Active Engineering, not passive monitoring: every energy flow is visualised, every decision auditable, and every system commissioned to Flexitest Ltd commissioning standards.
Independent consultancy, not sales. Technical rigour, not guesswork.
We conduct heat loss calculations, solar modelling, airflow rates and electrical specification to create a 'Construction-Ready' technical pack. Fixed fee. No upselling.
We hand your detailed specification to our MCS-Certified Partner Network for a guaranteed fixed-price quote. You approve before any work starts.
Installation is carried out by MCS & Part P - certified specialists, with oversight from your design consultant. No variations. No surprises.
Transparent Engineering. Fixed Fees. 0% Commission on Hardware.
Independent consultancy you can trust
Desktop review & budget estimation
Complete specification for contractor tendering
Site visits & performance validation
Installation by our MCS-Certified Partner Network, including KeySpark Electrical (NAPIT, MCS, ECS & TrustMark Certified)
View All Packages & PricingWhat's included in our design specifications
G99 compliant PV arrays with DC-coupled battery integration. DNO application management and export limitation design for 2026 mandatory compliance.
Electrical infrastructure design for ASHP/GSHP systems. Load profile analysis, COP optimisation, and buffer vessel control integration.
Load-balanced EVSE specification with dynamic current limiting. Integration with solar export and time-of-use tariff optimisation.
Electrical specifications for mechanical ventilation systems. Silent operation validation and smart home integration for air quality control.
Loxone and KNX system design specifications. Integrated control of lighting, heating, ventilation, and energy systems with predictive algorithms.
Full SAP calculation support and Building Regulations compliance documentation. Target emission rate achievement and evidence compilation.
Warm Homes Plan Compliance Verification
Minimum 1.5kWp per bedroom required for new builds from April 2026
Gas boiler ban in effect. Heat pump or equivalent low-carbon solution required
Export tariff integration for grid balancing and revenue generation
32A circuit provision for future EV charging capability
SAP calculation demonstrating target emission rate achievement
0% VAT Available
Eligible energy-saving installations qualify for zero-rated VAT
Independent analysis of the 2026 requirements. How to secure 0% VAT and avoid the £10,000 cost of mis-specification. We calculate loads precisely so you don't overpay for oversized hardware. Technical guide with heat loss methodology, schematic examples, and compliance checklists.
Instant PDF delivery. No spam. Technical content only.
Integravolt is the energy consultancy division of Flexitest Ltd (Company No. 07344798), a UK-registered engineering firm founded by David Richards. With over 15 years of electrical engineering experience, Integravolt provides independent, fixed-fee energy design for self-builders and renovators across England and Wales.
All engineering work is carried out in accordance with BS 7671 (IET Wiring Regulations 18th Edition), BS EN 12831 (heat loss calculations), SAP 10.2 (Standard Assessment Procedure for energy rating), and Approved Document Part L (conservation of fuel and power). Integravolt is not an installer and does not earn commission on equipment sales, ensuring recommendations are based purely on technical merit.
Self-builders constructing a new dwelling can save up to 20% on qualifying energy technologies through 0% VAT under HMRC VAT Notice 708. Qualifying installations include solar PV, battery storage, air-source and ground-source heat pumps, EV charging infrastructure, and MVHR systems. On a typical energy package costing £50,000-£100,000, this represents a saving of £10,000-£20,000. Integravolt provides the engineering documentation to support your VAT reclaim.
The Part L solar requirement for 2026 mandates approximately 1.5 kWp of solar PV per bedroom for new dwellings under SAP 10.2. This means a 4-bedroom home typically requires a minimum 6 kWp system. Orientation penalties for non-south-facing arrays can increase this requirement by 15-25%. Integravolt calculates your precise requirement based on dwelling fabric performance, heating system COP, and roof orientation.