Dorking based. Home focused.
Comfort at home.
All year round.
Heating, air conditioning and plumbing for homes across Surrey and West Sussex. From the everyday repair to your next big improvement, you’re in good hands.
Request online. We’ll confirm your appointment by email.
Real work. Real homes. Gas Mark.
A clear guide to our prices.
All prices include VAT.
Boiler & system service
£95Includes pressure vessels on heating and hot-water systems, including Megaflo.
Air conditioning service
£110Includes servicing the indoor and outdoor unit.
Boiler supply & fitting
From £2,400The final quotation depends on the boiler and installation work required.
Domestic air conditioning
From £2,200Supply and fitting, with a quotation based on your home and installation requirements.
Power flushing
From £720The final quotation depends on your heating system and the work required.
Emergency call-outs
From £120Daytime call-outs from £120.
After 5pm: from £160.
Attendance is subject to availability.
An urgent leak or breakdown?
For the fastest response, message Mark on WhatsApp with your postcode and a brief description.
We’ll confirm the work and charges with you before going ahead. Any additional repairs are discussed and agreed separately.
Request an appointment →What can we help with?
Good care for
the whole home.
One local company for the systems that make your home work, feel comfortable and run smoothly.
HeatingBoilers & heating
Keep your home warm and your hot water running, with boiler servicing, fault finding and repairs.
Boiler servicing & repairsPlumbingPlumbing & bathrooms
From a dripping tap to a bathroom transformation. Practical plumbing and a finish that feels right.
Plumbing & bathrooms
Air conditioningAir conditioning
A cooler kind of comfort for your bedroom, living space or home office, with carefully planned air conditioning.
Explore air conditioning
HeatingBetter heating, throughout
Central heating, underfloor heating and system improvements, planned around your home.
Explore heating systems
System careGive your heating a fresh start
Cold radiator spots or uneven heating? We’ll assess your system and advise whether a power flush could help.
Explore power flushingHeating controlsHeating controls & efficiency
Make heating easier to manage, with suitable controls, practical system improvements and advice on using energy more efficiently.
Explore heating upgradesTime for a new boiler? Let’s find the right fit for your home.
Boiler installationsNow installing air conditioning
A better temperature.
A better place to be.
A bedroom that stays comfortable. A home office you can focus in. We’ll help you choose the right air-conditioning setup, plan the installation and keep disruption to a minimum.
The Gas Mark approach
A clear plan.
A home treated with care.
You should know what’s happening, what’s involved and what comes next.
Tell us what you need
Choose a service, share your address and request a convenient appointment online.
We agree the next step
We review your request, confirm the visit and explain the work and costs before going ahead.
We get to work
We protect the working area, keep you informed and tidy up at the end of each day.
You’re ready to enjoy it
We check the completed work, explain any new controls and answer your questions.
A closer look at our work
The details make
the difference.
A few examples of our bathroom, boiler and heating work.
Let’s make it easy
Your next visit.
A few clicks away.
No need to find time for a phone call. Tell us what you need, choose your preferred day and request a morning or afternoon arrival window.
We’ll review the details and email you to confirm whether we can accept your appointment.
Choose an arrival window
Appointments are subject to approval.
Your visit is confirmed when you receive our confirmation email.
Local to you
Based in Dorking.
Here for your home.
Working across Surrey and nearby West Sussex, with visits arranged around your location and the work you need.
- Dorking
- Leatherhead
- Reigate
- Redhill
- Guildford
- Epsom
- Cobham
- Horsham
- East Horsley
- West Horsley
- Bookham
- Fetcham
Hear from our customers
Confidence starts
with real experiences.
See what customers say about Gas Mark on Google and TrustATrader.
A few useful answers
Good to know.
Before we visit.
Not sure where to start? We’re happy to help you work out what your home needs.
Ask us a questionCan I book without making a phone call?
Yes. Use our online booking page to tell us the service you need, your address and your preferred date and arrival window. We’ll review your request and email you with the outcome.
Is my appointment confirmed straight away?
Your selection is an appointment request. The visit is confirmed only when you receive an approval email from Gas Mark. Please wait for that confirmation before making arrangements around the visit.
What do the morning and afternoon windows mean?
These are arrival windows: 8am–12pm or 12pm–4pm. They are not the length of the job. The time needed for the work depends on what’s involved and will be discussed with you.
Will an installation leave my home in a mess?
We plan the work with you, protect the working area and tidy up at the end of each day. If the job needs drilling, lifting floors or other disruptive work, we’ll explain that beforehand.
What if I need help with an urgent leak or breakdown?
For urgent call-outs and the fastest response, message Mark on WhatsApp with your postcode and a brief description of the problem. Daytime call-outs start from £120, and out-of-hours call-outs after 5pm start from £160, including VAT. Please wait for Mark to confirm that he can attend.
I’m not sure which service I need. Can you help?
Of course. Send us a short description through the contact page, including your location and what you’ve noticed. We’ll help you work out the right next step.
Let’s get your home
feeling right.
A service, a repair or something new. We’re here to help.