Smart home technology integrated during a renovation delivers convenience, energy savings, and security with minimal visual intrusion. But specifying it well requires understanding the systems, their interdependencies, and the infrastructure that enables them.
Smart home integration is most elegantly achieved during a renovation, when walls are open, cables can be run neatly, and control points can be positioned before plastering. Retrofitting smart technology into a finished property invariably involves compromises — surface-mounted cable conduit, visible wireless hubs, and wireless protocols that are less reliable than wired alternatives. Getting the infrastructure right during construction costs a fraction of what remediation requires.
This guide covers the principal systems that make up a smart home, the infrastructure each requires, and the decisions that most affect long-term performance and expandability.
The foundational principle: wired infrastructure first
All smart home systems perform better when supported by a wired infrastructure backbone. Wireless protocols (Zigbee, Z-Wave, Wi-Fi, Thread/Matter) have improved significantly, but wired connections remain more reliable, lower-latency, and less susceptible to interference.
During a renovation, the right approach is:
- 1.Run wired infrastructure to every point that might reasonably need it — light switch positions, ceiling voids for speakers, above doors for cameras, beside windows for motorised blinds.
- 2.Commission wireless devices only where wired infrastructure is genuinely impractical.
- 3.Plan the network infrastructure (switches, patch panel, server room or cupboard) before any cable is run.
Cable installed during a renovation and never used is not wasted — it is future-proofing at near-zero marginal cost. Cable that cannot be run retrospectively without decoration damage is an expensive omission.
Network infrastructure
The entire smart home depends on network infrastructure. This is the first specification to agree with the client and the AV/IT consultant.
Structured cabling: CAT6A (augmented category 6) is the current standard for new installations. Supports 10 Gbps over 100 m, which is adequate for any current residential application. CAT5e is acceptable for non-critical runs; avoid it for primary runs given the marginal cost difference. All cables terminate at a central patch panel in the server room or data cupboard.
Wi-Fi access points: Hard-wired mesh Wi-Fi (Ubiquiti UniFi, Cisco Meraki, or similar enterprise-grade system) provides consistent coverage without the dead spots of consumer routers. One access point per floor is a minimum; one per large room in a multi-storey house. Access points are ceiling-mounted and require a PoE (Power over Ethernet) switch — which means no separate power outlet is needed at each AP location, but the switch must be PoE-capable.
Network switch: A managed PoE switch in the data cupboard distributes network, powers access points, IP cameras, and other PoE devices. Specify with at least 30–50% headroom over current requirements for expansion.
UPS (Uninterruptible Power Supply): For a system that includes security, access control, and CCTV, a UPS protecting the network core ensures the system continues to function during a mains power interruption. A 1–2 kVA UPS provides 30–60 minutes of runtime for network equipment.
Lighting control
The most impactful smart home system in terms of daily use. Lighting control systems range from simple smart switches to full architectural systems.
Smart switches (Lutron Caseta, Legrand Netatmo, Shelly): Replace standard switches with smart equivalents that can be controlled via app, voice, or timer. Require a neutral wire at the switch position (absent in many older UK installations — check before specifying). Affordable and effective; appropriate for less critical rooms or retrofit situations.
Whole-house architectural lighting control (Lutron HomeWorks QSX, Crestron, KNX): Centralised lighting control where all circuits terminate at a central processor. Keypads at switch positions send commands to the processor, which dims and controls circuits. Enables lighting scenes (single button press sets living room to "movie mode": blinds down, lights at 20%, ambient on). The reference standard for luxury residential.
KNX is an open protocol (not proprietary) supported by hundreds of manufacturers — suitable for complex multi-system integration. Lutron HomeWorks QSX is proprietary but industry-leading in dimming quality and reliability. Crestron integrates lighting, AV, HVAC, and access control in a single platform.
Dimming compatibility: LED drivers must be specified as DALI-compatible (for architectural systems) or Triac/0-10V dimmable (for standard systems). Not all LED downlights are dimmable, and not all dimmable LEDs dim to low levels without flicker. Specify and test the lamp-driver-controller combination before ordering at scale.
Cable requirements: For architectural lighting control, all switch positions require a data cable (CAT5e or proprietary bus cable depending on the protocol) in addition to the power circuit. This must be coordinated with the electrical first fix.
Blind and curtain automation
Motorised blinds and curtains integrate naturally with lighting control systems to create complete scene control.
Roller and Roman blinds: Silent motor manufacturers include Somfy, Lutron Sivoia, and Becker. Lutron Sivoia QS integrates directly with Lutron HomeWorks; Somfy integrates via third-party drivers into most control systems.
Curtain tracks: Motorised track systems (Silent Gliss 5600, Somfy Glydea) allow curtains to be drawn via app or scene. Ceiling fixing is required for the track; a power supply (discreetly positioned) is needed at each track.
Blackout in bedrooms: Motorised roller blinds with side channels (blackout cassette) and motorised curtains in series provide full blackout — important for London properties in summer. Both can be integrated into a wake-up scene (gradual brightening of lights + blind raise at a set time).
Climate control
HVAC and climate control integration allows temperature to respond to occupancy, time of day, and external conditions.
Smart thermostats: Nest, Hive, and Tado are entry-level wireless systems suitable for a single-zone or simple multi-zone installation. They replace the standard thermostat and require no additional infrastructure beyond a Wi-Fi connection.
Multi-zone HVAC control (KNX, Crestron, Loxone): For properties with underfloor heating in multiple zones, fan-coil units, or a mixed HVAC system, a centralised control system allows each zone to be individually managed and integrated with occupancy and blind position. Loxone is particularly strong for HVAC integration — it can reduce heating and cooling based on blind position (reducing solar gain in summer) and occupancy sensors.
MVHR (Mechanical Ventilation with Heat Recovery) integration: Most modern MVHR units (Zehnder, Vent-Axia, Paul) have digital interfaces (Modbus or proprietary) that can be integrated into KNX or Loxone to respond to CO2 sensors and humidity, boosting ventilation when occupied or when cooking.
Security and access control
CCTV: IP cameras (Hikvision, Axis, Milestone) recording to a local NVR or cloud service. For a luxury residence, cameras are specified at key points: main entrance, rear access, garage, and any areas of particular sensitivity. PoE cameras are powered and connected via a single CAT6A cable.
Video doorbell and intercom: Comelit, Siedle, or 2N systems provide HD video intercom at the front door, integrated with the home network and accessible via phone app when remote. For a gate intercom, a separate access control panel can manage multiple entry points.
Smart locks: Yale, Assa Abloy (CLIQ), and Nuki systems provide keypad, app, or fob access and integrate with alarm and access control systems. Specify the lock body and handle before the door is hung — some smart locks require a specific cylinder preparation.
Intruder alarm: Ajax, Honeywell Galaxy, or Risco systems with wireless peripherals (PIR, door contacts) integrate with the smart home to enable arm/disarm from the app and to trigger lighting scenes on alarm activation.
AV and multi-room audio
Sonos is the standard entry-level multi-room audio system — wireless, easy to install, and sufficient for most residential applications. For a higher specification:
Distributed audio (Crestron, Savant, Russound): Centralised amplifiers distribute audio to passive speakers throughout the property. Each zone can play different content independently. Requires in-ceiling or in-wall speakers (specified for the room acoustic), speaker cable run to the central rack, and an audio source (streaming, NAS, or external).
In-ceiling speakers: Sonance, Monitor Audio (Vecta), and Bowers & Wilkins (Formation Suite) are common residential specifications. Fire-rated enclosures are required above occupied rooms in multi-storey buildings. Specify the speaker aperture size before the ceiling is boarded — speaker apertures are cut after boarding, but the backbox (if used) must be installed behind the board.
Control integration and programming
A system that integrates lighting, blinds, HVAC, AV, and security requires a central controller (Crestron, Savant, Loxone, or Control4) and programming by a qualified integrator.
Allow a budget for commissioning and programming that is at least 20–30% of the hardware cost. A system installed but not programmed is not a smart home — it is a collection of expensive components. Programming time is proportional to complexity; a full scene-based system for a six-bedroom house can require 40–80 hours of integrator time.
The integrator should be involved from the specification stage — not called in at the end of a renovation to connect what has been installed. Late-stage involvement is one of the most common causes of under-performing smart home systems.
Cost guidance
Network infrastructure, structured cabling, Wi-Fi (4-bedroom house): £5,000–£12,000.
Entry-level smart lighting (smart switches, app control): £3,000–£8,000.
Architectural lighting control (Lutron HomeWorks QSX, full house): £20,000–£60,000.
Motorised blinds (10 windows, Somfy motors): £8,000–£20,000.
Full smart home integration (lighting, blinds, HVAC, AV, security, KNX or Crestron): £60,000–£200,000+ depending on scope and specification level.
Commissioning and programming: typically 20–30% of hardware cost on top of the above.
The difference between a connected home and a smart home is design intention. Devices that happen to have apps do not constitute integration. A well-specified and programmed system that responds coherently to occupancy and time of day is a fundamentally different — and more valuable — thing.
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