Compliance Verification Services
Expert engineering verification to secure your zero-rated VAT status and ensure full Part L compliance.
Certified by Flexitest Ltd
Co. No. 07344798
Digital Certificate
IntegraVolt Verified
3D Modelled Plans
Potential VAT Saving
£0.00
Based on a £300k project. Don't leave it to chance.
Secure Your 0% VAT Status
Risk vs Reward: Professional verification that protects your investment
20% VAT Savings
How we protect your £60,000 eligibility
Avoid £5,000+ Fines
Preventing Building Control refusals and Part L penalties
Total Risk Mitigation
Professional indemnity-backed engineering sign-off from Flexitest Ltd
What Does a £995 Technical Design Pack Look Like?
Below is the anatomy of our unified engineering blueprint. It is the single source of truth for your architect, electrician, and plumber.
Room-by-Room Heat Loss
Sized to BS EN 12831. No oversizing waste. Every radiator and underfloor loop calculated for optimal comfort.
3-Phase Electrical Schematic
Load-balanced for heat pump, EV charger, and solar PV. DNO-ready with full diversity calculations.
Solar & Battery Simulation
Octopus Agile modelling with payback analysis. PVsyst simulation integrated with SAP 10.
MVHR / Flexivent Part F Spec
Whole-dwelling ventilation strategy. Duct routing, air flow rates, and commissioning schedule.
DNO G99 Application Pack
Pre-filled for solar, battery, and EV connections. Ready for district network operator submission.
VAT Compliance Checklist
Line-by-line materials audit against Notice 708. Every item verified for zero-rate eligibility.
|Flexitest LtdRoom-by-Room Heat Loss
BS EN 12831 Calculations
|Flexitest Ltd3-Phase Electrical Schematic
Load-Balanced Design
|Flexitest LtdFlexivent Part F Spec
Ventilation Strategy
|Flexitest LtdOctopus Agile Logic Map
Tariff Optimisation Model
|Flexitest LtdSolar PV Simulation
Annual Yield Analysis
Professional Engineering Documents
Every pack contains 5-6 fully coordinated deliverables, professionally formatted and ready to hand directly to your trades.
Branded and certified by IntegraVolt and Flexitest Ltd. All calculations are optimised for UK building regulations and current energy tariffs.
Service Roadmap: Your Path to Compliance
A proven 4-step process that delivers certification in 7-11 business days
Document Review
Analysis of your quotes, architectural plans, and SAP calculations. We verify what you have and flag what is missing.
Gap Analysis
Identification of regulatory discrepancies against Part L, Part F, and VAT Notice 708. Every gap is documented.
Optimisation Report
Maximise VAT savings and SAP alignment. Full technical design pack with electrical schematics, MVHR specification, and solar simulation.
Final Certification
Written certificate for HMRC and Building Control. Professional engineer sign-off backed by professional indemnity insurance.
Book Your Discovery Call
Let's discuss your project and how we can secure your compliance and VAT savings
Certified by Flexitest Ltd
Company No. 07344798
Frequently Asked Questions
What is included in a Part L compliance verification?
Our Part L compliance verification includes a full SAP 10.2 assessment, BS EN 12831 heat loss calculations, solar PV sizing confirmation against the 1.5 kWp per bedroom rule, and a written compliance report suitable for Building Control submission. All work is certified by Flexitest Ltd (Company No. 07344798).
How do I save 20% VAT on my self-build energy systems?
Under HMRC VAT Notice 708, self-builders constructing a new dwelling for personal use can reclaim VAT on qualifying energy technologies including solar PV, battery storage, heat pumps, and EV charging infrastructure. You must hold valid planning permission and the property must be a new build — not a conversion or renovation. Integravolt provides the engineering documentation needed to support your VAT reclaim.
What is the Part L solar requirement for 2026?
Under Part L of the Building Regulations and SAP 10.2, new dwellings must meet a minimum Dwelling Emission Rate (DER) that effectively mandates renewable energy generation. The commonly referenced guideline is approximately 1.5 kWp of solar PV per bedroom, though the exact requirement depends on your dwelling fabric performance, heating system, and orientation.
Do I need a three-phase supply for my self-build?
A three-phase supply is recommended for homes with combined electrical loads exceeding 16-18 kW — for example, a heat pump (5-12 kW), 22 kW EV charger, solar inverter, and electric cooking. Single-phase supplies are limited to approximately 100A (23 kW), which may not support simultaneous high-demand appliances. A DNO application for three-phase typically costs between £1,500 and £5,000.
What is a Technical Design Pack from Integravolt?
The Technical Design Pack (£995) is a comprehensive engineering specification for your self-build energy system. It includes room-by-room heat loss calculations to BS EN 12831, solar PV array design with shading analysis, EV charging infrastructure planning, three-phase load assessment, SAP 10.2 compliance documentation, and installer-ready technical drawings. The pack is reviewed by David Richards and delivered within 3-5 working days.
What standards does Integravolt work to?
All Integravolt engineering work is carried out in accordance with BS 7671 (IET Wiring Regulations), BS EN 12831 (heat loss calculations), SAP 10.2 (energy performance), and Approved Document Part L (conservation of fuel and power). Verification services are certified by Flexitest Ltd, Company No. 07344798, a registered UK engineering consultancy.
All verification services are certified by Flexitest Ltd (Company No. 07344798), a UK-registered engineering consultancy. Work is carried out to BS 7671, BS EN 12831, SAP 10.2, and Approved Document Part L. For technical enquiries, contact technical@integravolt.co.uk.