1. What building services (MEP) are
Building services (MEP) cover electrical, plumbing/sanitary and HVAC/ventilation. Hidden behind finishes and structure, they directly shape comfort, running cost and future replaceability — typically 15–25% of shell cost (guide).
2. Electrical — capacity, wiring, future-proofing
Panel capacity, outlets and circuits, EV charging, data (fibre/LAN), security and AV. Capacity and conduit routes are hard to expand later, so size generously for future appliances, EVs and home working.
3. Plumbing — design for replacement
Hot-water type, pipe material and falls, and access panels matter. Pipes are buried in walls/floors and hard to replace later, so build in replaceability (header/sheath-pipe systems) from the start.
4. HVAC & ventilation — comfort with efficiency
Whole-house or split; first-type (heat-recovery) or third-type ventilation. 24-hour ventilation is legally required; planned together with insulation (climate design) it pays off in both comfort and bills.
5. Invest first in what's hard to replace
Finishes and fixtures can be upgraded later, but piping, wiring, capacity and air paths are built into the frame. Cutting them gets costly at future repair/upgrade. See where to cut and where not to.
Common pitfalls
| Risk | Prevention |
|---|---|
| Too little electrical capacity for EVs/large appliances | Size capacity and circuits generously for future demand |
| Pipework with no replacement path → major rework later | Build in access panels / sheath-pipe replaceability early |
| HVAC/ventilation out of step with insulation → condensation, higher bills | Design insulation/airtightness and HVAC together |
| Services underrated, capacity cut for finishes | Reserve 15–25% of shell for services |
Services are the "invisible infrastructure." Investing first in hard-to-replace piping, wiring, capacity and air paths — rather than showy finishes — is what keeps a home comfortable and maintainable 20 years on.
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