Why cabling decisions outlast almost everything else
Computers, phones, routers and access points all get replaced on 3–5 year cycles. Cabling stays in the walls for 15–25 years. The decisions made during a fit-out — what cable, where it runs, how the rack is laid out, what gets labelled — determine how easy or painful every change is for the next two decades.
A good cabling fit-out is invisible. A bad one shows up every time someone adds a desk, replaces a switch, or troubleshoots a fault.
What a fit-out actually involves
A typical office cabling fit-out runs in five stages:
- Discovery and design — floor plans, device counts, future flex.
- Material and rack design — cable type, lengths, patch panels, switch sizing.
- Installation — running cable along approved paths, neatly and to standard.
- Termination and testing — both ends terminated, every link certified, results recorded.
- Handover — labelled rack, as-built documentation, test reports.
Each stage compounds. Skip one and the next is harder.
Choosing the right cable
For most offices in 2026:
- Cat6 — the practical default for data, voice, Wi-Fi APs, cameras and PoE devices. Supports 1 Gbps comfortably and 10 Gbps over shorter runs.
- Cat6A — worth specifying for new builds with a long planned life, very dense PoE, or where 10 Gbps to the desk is on the roadmap.
- Fibre (single-mode and multi-mode) — for backhaul between racks, floors and buildings. Single-mode wins for distance and future-proofing; multi-mode is fine for short in-building runs.
Avoid Cat5e for new installs. The cost saving is small and the future flexibility loss is real.
Planning the comms rack
The comms rack is where the cabling story ends and the active network begins. Design choices that matter:
- Rack size. Leave at least 30% empty space for future growth. A full rack at install is a full rack forever.
- Patch panels at the top, switches below, with horizontal cable managers between — the standard layout that makes patching tidy.
- Power. A UPS sized to keep the rack running for 15–30 minutes during an outage. Surge protection. Enough outlets.
- Cooling. Even small racks generate heat. Ventilation matters in cupboard installations.
- Labelling. Every cable, every port, every patch. Consistent scheme. Documented.
A tidy rack on handover day stays tidy. A messy one gets worse every time someone touches it.
Coordinating trades
Cabling lives alongside electrical, building, HVAC and joinery. The fit-out runs smoother when:
- Cable paths are agreed with the builder and electrician before walls go up.
- Conduits or pathways are installed during the rough-in stage, not after.
- Power outlets near workstations are planned with data outlets, not as an afterthought.
- The comms cupboard has power, cooling and clean fire-resistant penetrations from day one.
The cost of running cable through finished walls is several times the cost of running it during construction. Getting in early is the single biggest cost saver in a fit-out.
Testing and certification
Every link should be tested and certified before handover. For copper, this is a wire-map and performance test against the relevant Cat6 or Cat6A standard. For fibre, it’s continuity, loss and (for longer runs) OTDR.
The test results matter for two reasons:
- Confidence. You know every cable does what it’s supposed to before furniture goes in.
- Warranty. Most manufacturer cable system warranties (commonly 25 years) require certified test reports.
Keep the test reports with the as-built documentation, not in someone’s email.
Documentation that pays off
A good handover pack includes:
- Labelled floor plan showing every outlet location and its identifier.
- Rack elevation drawing showing patch panel, switch and cable layout.
- Patch schedule (which outlet patches to which switch port, on which VLAN).
- Cable test reports.
- Materials list (cable type, manufacturer, batch — useful for future warranty claims).
Six months later, when someone asks “what’s behind outlet 3-4-A?”, documentation answers in 30 seconds. Without it, the answer is “let me trace it.”
Common mistakes
- Under-counting outlets. Add 30–50% to your estimated count. The cost per outlet at install time is a fraction of running them later.
- Cheap cable. The cable is the cheapest part of the install. Saving here costs you for the next 20 years.
- No spare capacity in the rack. Plan for growth or pay for it later.
- Skipping labelling. Always feels optional during install. Never feels optional during a fault.
- No as-built drawings. Every fit-out should produce them. Surprisingly often they don’t.
In summary
A cabling fit-out is an opportunity to set up your office for a decade or more of easy support and easy change. The right cable, the right rack design, sensible labelling and proper documentation cost very little extra at install time and pay off every time you touch the network afterwards.