The true cost of garden office electrics in Surrey.

A garden office or outbuilding is one of the most popular home upgrades today. But while the building itself gets lots of attention, many homeowners are surprised at the cost—and importance—of powering it properly. Let’s break down what’s involved in garden office electrics and what you can expect to pay.

Recent Garden Office / Gym electrical Installation in Dorking. Quite a big feed to this one to cater for an EV charger

⚡ What’s Involved in Powering a Garden Office?

Running power to an outbuilding is more than “just a few sockets.” A safe installation typically includes:

• Armoured cable (SWA) from your main house supply

• A consumer unit (fuse board) in the garden office to keep circuits protected

• Sockets and lighting designed for your use (workstations, LED lighting, security)

• Heating circuits for infrared panels, radiators, or underfloor heating

• Optional data cabling (Cat 6) for reliable internet

Every installation must comply with BS 7671 Wiring Regulations and be signed off under Part P of the Building Regulations. That means it has to be installed and certified by a qualified electrician.

💷 Typical Costs in Surrey, Epsom and surrounding areas

Prices vary depending on the size of the room, distance from the house, and the spec you choose—but here’s a realistic guide:

• Basic Package – from £950 - Armoured feed, small consumer unit, 1–2 sockets, ceiling LED light.

• Standard Package – £1,800 to £3,000 - Full ring circuit, LED lighting, consumer unit, external security light.(Price depends on distance, trenching, and specification.)

• Premium Package – from £3,000 - Additional heating circuits, underfloor heating, CAT6 cabling, smart controls, EV-ready feed, security systems, designer lighting.

Underfloor heating, for example, starts at around £850 for a 3 × 3 metre room including mat and thermostat.

🏡 What Affects the Cost?

• Distance from the house – longer SWA cable runs add labour and materials

• Spec of the building – more sockets, lighting, and heating circuits = higher cost

• Groundworks – trenching or ducting for the cable run

• Future-proofing – adding data cabling, EV-ready supplies, or smart systems

✅ Why It’s Worth Doing Properly

• Safety: Outdoor supplies must be RCD protected and correctly earthed.

• Compliance: You’ll get a NICEIC Electrical Installation Certificate for your records and insurance.

• Longevity: A proper setup ensures your office is usable year-round without overloading circuits.

  
  
  
  
  
  

  

  Design for garden building in Guildford.

👉 Final Word

A garden office is a long-term investment—treating the electrics as an afterthought can lead to costly problems. Getting it done right from the start means peace of mind, comfort, and compliance.

Looking to power your garden office in Epsom, Surrey, Sussex or the surrounding areas? Get in touch today for a free, no-obligation quote.

Contact