High-Spec
Extension
Milford-on-Sea
A 6-week complete electrical installation for a five-bedroom detached house extension in Milford-on-Sea — swimming pool controls, Zappi EV charger, electric UFH, induction hob, pergola, 50-metre remote tree lighting, and a dual-row Hager consumer unit. Part P notified.
first & second fix
wired & commissioned
for tree feature light
first & second fix
Extending a High-Spec Home
The client was adding a substantial extension to their five-bedroom detached house in Milford-on-Sea — an outdoor swimming pool, a new kitchen and utility room, a bathroom, a garage with EV charging, and a garden with a pergola, external barbecue station, and feature tree lighting. The existing property needed partial rewiring and modification to integrate with the new installation.
At this level of specification, the electrical design has to account for everything simultaneously: load calculations across the new and existing circuits, zone compliance in the bathroom, outdoor IP ratings for the pergola and pool circuits, and a consumer unit robust enough to handle the full load of a property running induction cooking, underfloor heating, EV charging, and pool equipment concurrently.
The client had been recommended SC Electric. They were building something to last, and they needed an electrician who would treat the specification the same way.
The installation is centred on a two-row Hager consumer unit fitted with RCBOs — individual residual current protection on each circuit rather than shared RCD banks. This means a single fault on one circuit cannot trip the rest of the property. On a high-spec home with a pool, EV charger, and underfloor heating all running simultaneously, this is the correct approach. MCBs power the external concrete barbecue station separately.
Room By Room
Seven distinct zones, each with its own electrical requirements. Every circuit planned, installed, and tested across first and second fix.
Kitchen
- —Induction hob — island unit
- —Double oven & warming drawer
- —Wine cooler circuit
- —Fridge & freezer spurs
- —USB sockets — island
- —Interlinked heat detector
- —Pendant lighting
- —Recessed downlights
Bathroom
- —Electric shower circuit
- —Electric underfloor heating mat
- —UFH thermostat
- —IP-rated lighting
- —Extractor fan circuit
- —Electric mirror connection
Garage
- —Zappi EV charger installation
- —Socket circuits
- —Lighting circuits
Living Room
- —TV aerial socket
- —Data sockets — multiple locations
- —CO₂ detector — solid fuel fireplace
- —Multi-way switching
- —Lighting circuits
Utility Room
- —Ethernet switch — wired internet hub
- —Data runs — house + garden room
- —Swimming pool controls
- —Pool lighting circuits
- —Wet UFH thermostat — extension
- —Dedicated boiler power feed
Garden & External
- —Electric pergola roof connection
- —Pergola lighting installation
- —External barbecue station — MCB fed
- —Outdoor kitchen sockets — IP rated
- —Tree feature light
- —50m remote switching run
- —2-way & intermediate switching
How a 6-Week Job Works
A project of this scale runs in two distinct phases. First fix happens while walls are still open — all cable routes, back boxes, and conduit are installed before plastering begins. Second fix follows once the building work is finished: accessories are fitted, circuits are tested, and the consumer unit is commissioned.
Getting first fix right determines everything that follows. A cable routed incorrectly in week one becomes a problem in week five. On a high-spec project like this, precision at first fix is not optional — there is no room to go back through finished plasterwork.
First Fix
All cable routes installed to each room and zone. Back boxes, conduit, and sub-main cables run before plastering. Consumer unit position established. Pool, pergola, and tree light sub-mains run to garden. Data and ethernet infrastructure roughed in.
Second Fix
All accessories fitted across every zone. Hager consumer unit populated and labelled. RCBOs terminated and tested individually. Zappi EV charger commissioned. UFH thermostats programmed. Pool controls connected and tested. Tree light remote switching verified at 50 metres. EIC issued on completion.
In Progress & Completed
First fix, second fix, and finished installation — open-plan kitchen lighting, pendant positions, recessed downlights, living room circuits, and external socket installation for the outdoor kitchen.
When a client is building a swimming pool, a pergola, and an outdoor kitchen on top of a full extension, the electrical spec touches everything. The job is not just connecting things — it's understanding how all of it runs at once and designing a distribution board that handles it without compromise.
Planning An
Extension?
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