ComGas installs additional sockets, circuits and lighting in homes across Farnham and the surrounding area — kitchen and extension circuits, outdoor and garden supplies, and lighting controls — checking the existing consumer unit's spare capacity before any new load is added.
A new socket or circuit has to fit what's already there, not just the wall it's fixed to.
Adding a socket or a circuit looks like a small job from the outside, but BS 7671 requires that any new work doesn't adversely affect the safety of the existing installation. In practice that means checking the consumer unit has a spare way and enough capacity, confirming the earthing arrangement extends properly to the new point, and deciding whether the addition sits on an existing circuit or needs one of its own.
Most additions are straightforward once that's confirmed. Occasionally the check reveals the board itself is the limiting factor — no spare ways, or already close to its rated capacity — in which case we explain that clearly before proceeding, rather than fitting the new work is asked for regardless.
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How we plan sockets, circuits and lighting
New sockets, kitchen circuits, outdoor supplies and lighting — checked against the existing installation.
Every addition starts with what's already installed: the consumer unit's spare capacity, the circuit an addition would join or need, and the environment the new work sits in, whether that's a kitchen, a garden or a ceiling.
Additional Sockets & Circuits
Whether a new socket joins an existing ring or needs a dedicated circuit of its own depends on what it's for and what the circuit already carries.
Additional sockets added to an existing ring circuit where there's genuine spare capacity for the extra load
Kitchen appliances such as cookers, ovens and dishwashers generally need their own dedicated circuit rather than sharing a ring
Extension and loft conversion circuits sized and routed back to the consumer unit as new dedicated circuits
Ring versus radial circuit design decided on cable size, run length and expected load, not fitted the same way regardless
Anything installed outdoors has to cope with weather and moisture as well as carry the electrical load, which changes both the cable and the accessories used compared with an indoor installation.
Outdoor sockets and fittings specified to an appropriate IP rating for their exposure to weather
Outdoor circuits protected by RCD protection as standard
Supplies run to outbuildings, sheds and garden offices as dedicated circuits from the consumer unit
Armoured or suitably protected cable specified for any run buried or exposed outdoors
Lighting circuits and their controls are designed together, because the switching arrangement and the type of fitting both affect what the circuit needs to support.
New lighting circuits and additional points added to existing circuits where capacity allows
Multi-way switching arranged for landings, stairs and larger rooms with more than one access point
Dimmer switches matched to the type of lighting fitted — many dimmers designed for older bulbs aren't compatible with LED fittings without checking
Smart lighting controls wired in as part of the circuit design where requested
Current regulations require that new electrical work doesn't compromise the safety of the existing installation, which is why even a small addition starts with a check of what it's being added to.
Consumer unit spare ways and overall capacity checked before any new circuit is added
Earthing and bonding arrangements confirmed as adequate for the new work
Where the board has no spare capacity, that's identified and explained before anything is quoted
An addition that reveals a wider issue is scoped as a separate, clearly explained piece of work
Why one socket sometimes leads to a bigger conversation
New work isn't allowed to compromise the safety of what's already there.
BS 7671 sets a general requirement that any addition or alteration to an electrical installation must not adversely affect the safety of the existing installation. That single principle is why a request for one more socket sometimes turns into a wider look at the consumer unit — if the board has no spare ways, or the existing circuit is already close to its rated capacity, adding load to it without checking would be exactly the kind of change the regulation is there to prevent.
In practice this affects a small minority of additions. Most homes have some spare capacity, and most single-socket or single-circuit additions are straightforward. But we check first rather than assume, because the alternative — fitting the addition and leaving an overloaded circuit or a board with no protection margin — isn't something we're prepared to do regardless of how small the original request looked.
New electrical work must not compromise the safety of the existing installation
Consumer unit spare capacity is checked before any addition, not assumed
Most single-socket or single-circuit additions are straightforward once checked
Where capacity is a genuine issue, it's identified and explained honestly
Reviews from real ComGas customers, shown as submitted through Google.
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Lucie Victoria
15 May 2025
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Excellent service, highly recommend
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James Mowat
30 April 2025
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Incredible service — problems fixed perfectly once again.
Lee, Paul and the team at COMGAS are fantastic. They arrived on time and got straight to work, quickly identifying the root cause of the plumbing and heating issues I was experiencing.
The problems were diagnosed swiftly, I was kept fully informed throughout, and both issues were fixed with impressive speed and precision.
Having worked in the industry for nearly 20 years, I know how rare it is to find reliable, trustworthy, and genuinely skilled professionals — let alone a team this good.
I joked about it at the time, but it’s true: I had the best shower I’ve ever had in this house after they finished the job — and I’ve lived here for 10 years!
I honestly couldn’t ask for more and can’t recommend COMGAS highly enough.
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Faz
31 March 2025
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ComGas replaced my boiler and water tank at short notice. So glad i used them. Thank you
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Laura Andrews
26 March 2025
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Lee came out to the school I work in to look at a problem with our heating, he diagnosed the issue and was able to fix it on the spot in a neat and tidy manor. Would highly recommend
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Chloe
26 March 2025
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I recently used Comgas for a gas and heating service, and I couldn't be more impressed! From start to finish, their team was professional, friendly, and highly knowledgeable. They quickly identified the issue with my heating system and explained everything in detail, offering both short- and long-term solutions.
The technician was punctual and took extra care to ensure everything was running smoothly. I really appreciated their attention to detail and how they made sure to clean up after the work was completed. My home is now warm and cozy, all thanks to their expert service. I highly recommend Comgas for anyone looking for reliable, efficient, and trustworthy gas and heating professionals!
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Bec Newey
8 July 2024
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Messaged Lee on a Sunday evening with request. Instant reply that evening and engineer came next day. Polite, professional and helpful. Thorough investigation and speedy resolution to a leak with sink in wc. Happy customer.
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P Duffy
2 April 2024
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Scott and the team have served me well over several years. Skilled craftsmen. Dependable careful and very cosy-effective. I highly recommend them.
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Cilla Trout
22 March 2024
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Definitely recommend friendly reliable service
Scott was helpful and reassuring regarding our boiler answered our concerns and explained the problem and best course of action thank you for your advice
Sockets, circuits and lighting questions
Frequently asked questions.
If you're planning an addition and aren't sure whether your existing wiring can take it, get in touch and we'll check before quoting anything.
Often, yes, provided the circuit has genuine spare capacity for the extra load. We check the circuit and the consumer unit before confirming, rather than assuming it's always straightforward.
Do kitchen appliances need their own circuit?
Generally, yes — cookers, ovens and dishwashers typically draw enough current to need a dedicated circuit rather than sharing a ring with other sockets.
Are outdoor sockets different from indoor ones?
Yes. Outdoor sockets and fittings need an appropriate rating for exposure to weather and moisture, and outdoor circuits are RCD protected as standard.
Can any dimmer switch be used with LED bulbs?
Not always — many dimmers designed for older filament or halogen bulbs aren't compatible with LED fittings and can cause flickering or humming. We match the dimmer to the fitting when specifying lighting controls.
Why would adding a circuit mean the consumer unit needs looking at?
Current regulations require that new work doesn't compromise the safety of the existing installation, so we check the board has a spare way and enough overall capacity before adding a new circuit to it.
Can I add a socket or supply to my garden or shed?
Yes, run as a dedicated circuit from the consumer unit with suitable outdoor-rated cable and accessories, and RCD protection. We assess the route and distance before proposing a specification.
Do you design decorative lighting layouts?
We design and install the electrical circuits and controls for lighting and fit the fittings you choose, but we're not an interior lighting design service — decorative layout and fitting selection is your call, and we'll advise on what the circuit can support.
How many sockets can go on one ring circuit?
There's no fixed number in the regulations — it's governed by the total floor area served and the load actually connected, which is why we assess the specific circuit rather than applying a rule of thumb.
