Diamond SPI is a design and engineering firm first. We design and plan every category below — for homeowners, contractors, and integrators. Component supply is a downstream capability, offered once the design is right.
Every service on this page is available to homeowners directly — not just contractors and trade pros. Home theater, smart home, lighting refresh, surge or battery backup — we'll design it, plan it, and walk you through it. We can source the components too, if you want. Tell us what you're working on →
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AV systems for residential, multi-room, and commercial environments — system architecture, signal flow, distribution design, and the full drawing set your installer needs to put it in clean. We can source and supply every component once the design is locked.
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Architectural and scene-based lighting for residential and commercial spaces — load calculations, zone mapping, fixture selection, dimming strategy, circuiting, and panel coordination, delivered as a plan your electrician can build to. Fixture and component supply available as a follow-on.
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Engineering design for MV power distribution — single-line diagrams, equipment schedules, load flow studies, and coordination studies. Submittal packages built to spec, ready for AHJ and engineering review, and coordinated with EPC contractors and utilities. Specification and supply for switchgear, transformers, metering, and protective relays follows design approval.
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Whole-facility and point-of-use surge protection for residential and commercial applications — SPD selection per NFPA 70 and IEEE C62.41, coordinated across service entrance, distribution, and branch levels, protecting sensitive AV, automation, and electrical infrastructure. Commercial-grade SPD supply available as a follow-on.
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Commercial-grade phase monitoring and protection — for phase loss, phase reversal, under/over voltage, and voltage imbalance. We plan protection for HVAC, elevators, motors, and industrial equipment, integrate with building automation and BMS, and deliver full submittal documentation. Relay specification and supply available as a follow-on.
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Complete solar distribution design — inverter specification, panel layout coordination, conduit routing, and interconnection planning, with engineering documentation handled end-to-end. We can also supply commercial-grade components direct to your site as a follow-on.
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Battery energy storage for residential and commercial applications — system sizing, inverter-charger specification, transfer switch coordination, and integration with existing electrical infrastructure, documented so your installer can build it cleanly. Equipment supply available as a follow-on for a single accountable source.
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Smart home and building automation across any platform or hybrid environment — system design, integration planning, and the programming and documentation for retrofit or new construction. When the design calls for a custom component, we fabricate it in-house.
Start a Design ConversationThe list above covers what we do most often — but our work is design and planning, and that travels. Working on a system that isn't listed? Reach out. We'll tell you straight whether we can design it, and exactly how we'd approach it. Start a design conversation →