What three-phase power costs in 2026 — single-to-three-phase upgrades, DNO charges, the consumer unit, and what drives the price. Realistic UK ranges for homes and businesses.

What commercial electrical maintenance costs in 2026 — PPM contracts, commercial EICRs, emergency lighting and reactive callout pricing. How UK businesses budget for it.

What fire and smoke alarm installation costs in 2026 — per interlinked alarm, whole-home systems, HMO detection and commercial fire alarms. Realistic UK price ranges.