Summary

Outdoor power sockets are a small, high-margin job that gets under-quoted more often than almost any other domestic electrical task. On the surface it looks like "one socket, one hole in the wall" — but the pricing has to account for IP-rated enclosures, a compliant RCD arrangement, cable route and burial depth if it crosses open ground, and the near-certainty that the customer will ask for "just one more" socket once the trench is open.

The two commercial models are spurring and new-circuit. Spurring from an existing indoor ring is the cheaper, faster option and is generally not notifiable under Part P if it doesn't create a new circuit and isn't in a special location — this is the £150–£280 job: drill through the wall, fit an IP-rated double-pole switched socket (IP44 minimum, IP55/IP66 for exposed positions), run 2.5mm² T&E through a short section of conduit, and terminate. A new dedicated circuit — the right answer for anything beyond a single low-load socket, or where the existing ring has no spare capacity — means running a new cable back to the consumer unit, finding or adding a way, and (in most cases) a Part P notification. That's the £350–£1,200+ job, with the top of the range driven entirely by cable route length and whether the ground needs digging.

The single biggest quoting mistake on this job type is treating it like an indoor socket with a weatherproof cover. It isn't. The IP rating, RCD protection, cable selection (SWA vs T&E-in-conduit) and burial depth are all different from indoor work, and missing any of them is both a compliance failure and a callback. Price the compliance in from the start rather than absorbing it as a surprise cost mid-job.

Key Facts

Quick Reference Table

Spending too long on quotes? squote turns a 2-minute voice recording into a professional quote.

Try squote free →
Job scenario Typical materials cost Typical labour Total price range Notes
Single spurred socket, short run indoors-to-outdoors £30–£60 2–3 hrs £150–£280 Fastest job; must confirm spare capacity on existing ring
Two sockets, one wall, spurred £60–£100 3–4 hrs £220–£380 Marginal extra cost per additional socket once wall is open
New dedicated circuit, short run (under 10m, no digging) £80–£150 4–6 hrs £350–£550 New way at consumer unit; Part P notifiable
New circuit with trenching to shed/garage (10–20m) £150–£300 1–1.5 days £600–£950 SWA cable, trench dig/reinstate, gland kits both ends
New circuit, long run with driveway crossing £250–£450 1.5–2.5 days £900–£1,400 750mm depth under driveway; may need ducting under hard surface
Hot tub / high-load outdoor supply (dedicated circuit) £200–£400 1–2 days £750–£1,300+ Often needs its own RCBO way and isolator local to the unit
Outdoor socket circuit for EV charger prep (separate from EV unit) £150–£300 1 day £550–£900 Distinct from EV charger installation itself — see ev charger pricing guide

Detailed Guidance

Pricing by scenario: spur vs new circuit

The decision between spurring and a new circuit is the first pricing fork, and it should be made on site, not on the phone. To spur safely you need: an existing ring or radial with genuine spare capacity, an accessible point to break into (ideally at a socket rather than mid-cable), and RCD protection already present on that circuit. If any of those three are missing, quote for a new circuit — trying to force a spur onto an overloaded or unprotected circuit is a compliance and safety failure, not a cost saving.

A spurred single socket is a 2–3 hour job for most electricians: isolate, drill through the wall (allow extra time for solid stone or cavity wall with insulation), fit a back box and IP66 accessory outside, run cable through conduit sleeved through the wall, terminate, test, and hand over. Materials are minimal — the IP66 accessory itself (£15–£35), a short length of conduit, glands, and fixings.

A new dedicated circuit changes the labour profile completely. You're now working at the consumer unit (finding or creating a spare way, which may mean recommending a consumer unit upgrade if the board is full — see consumer unit replacement pricing guide), running cable back through the building fabric, and — for anything beyond a metre or two outside the wall — trenching. Trenching and reinstatement is where quotes go wrong most often: digging 10–20 metres of trench by hand through an established garden with paving, root systems or existing services is a half-day to a day's labour on its own, before you've laid a metre of cable.

Materials cost breakdown

Item Typical cost Notes
IP66 double-pole switched socket (single) £15–£35 Budget to mid-range; heavier-duty commercial units cost more
IP66 double socket outlet £25–£50
SWA cable (per metre, 2.5mm² 3-core) £2–£4/m Price rises with core size and armour spec
T&E cable (per metre, 2.5mm² or 4mm²) £0.80–£1.80/m Only for short, protected (conduit) runs
Glanding kit (SWA gland, earth tag, per end) £8–£15 Two ends per run
Conduit/ducting (per metre) £1.50–£4/m Higher for anti-crush ducting under driveways
Underground warning tape £5–£10 per roll One roll covers most domestic runs
New RCBO way (if consumer unit has space) £15–£30 Device only; more if the board needs a bigger enclosure
Waterproof back box / surface enclosure £10–£25

Labour time and day-rate calculation

Work out labour the same way you would for any electrical job: hours × your hourly or day rate, then add materials at your standard markup. A worked example for a mid-size job:

Always separate trenching/reinstatement from the electrical labour in the quote breakdown, even if you're doing both — customers query "electrician's day rate" applied to digging a trench, and a transparent split avoids that conversation after the invoice lands.

Margin, contingency and what quotes commonly miss

Build in a contingency line for the things that only reveal themselves once you start: solid masonry walls that take three times longer to drill than a cavity wall, buried services (gas, water, old cabling) discovered mid-trench, and driveway or patio reinstatement that the customer assumed was "included." State reinstatement explicitly as included or excluded — relaying block paving or turf after trenching is a different trade's time and cost, and leaving it ambiguous is a common source of dispute.

Certification is not optional and should be a visible line item, not folded silently into labour — it signals professionalism and covers the time actually spent on testing and paperwork (typically 30–60 minutes per circuit).

Frequently Asked Questions

Is an outdoor socket always notifiable under Part P?

Not always. A straightforward spur from an existing, RCD-protected indoor ring that doesn't create a new circuit or touch the consumer unit is generally not notifiable. A new dedicated circuit, any consumer unit work, or an installation in a special location (near a pool, for example) is notifiable — either through a local authority building notice or self-certification via a competent person scheme (NICEIC, NAPIT, ELECSA). Quote for the notification/certification time as part of the job regardless, since testing and documentation are needed either way.

Can I just spur an outdoor socket off any existing ring?

Only if that ring has genuine spare capacity and is already RCD-protected. Check the existing circuit's total connected load, the number of existing spurs already taken from it, and confirm the RCD covering it is rated for outdoor use (30mA). If the ring is a shared, heavily-loaded kitchen ring, for example, don't spur an outdoor load onto it — quote for a new circuit instead. See spur vs radial vs ring final for the underlying rules.

Why does trenching cost so much relative to the electrical work?

Because it's manual, unpredictable, and time-consuming labour that has nothing to do with electrical skill — but it still has to be done to the same standard (correct depth, warning tape, reinstatement). A 15-metre trench through an established garden, avoided obstacles, and reinstated properly can easily take as long as the actual electrical first-fix and termination combined. Price it as its own line, at a realistic labouring rate, rather than absorbing it into your electrician's hourly rate.

Does the quote need to include an Electrical Installation Certificate?

Yes, for any new circuit. A Minor Electrical Installation Works Certificate is appropriate for additions/alterations to an existing circuit (like most spurs); a full Electrical Installation Certificate is required for a new circuit. Both require testing (continuity, insulation resistance, polarity, Zs, RCD operation) — build the time for this into your labour estimate, not as an afterthought.

Regulations & Standards