Business Details
Trusted HVAC Solutions for Commercial & Industrial Projects
With over four decades of experience serving commercial, industrial, and public sector clients, Callisia has established itself as a leader in mechanical services engineering. Based in Chertsey, Surrey, we deliver tailored solutions for projects of all scales, from minor modifications to comprehensive Cat A/B fit-outs. Our expertise spans ventilation, heating, air conditioning, and water systems, supported by advanced design tools like CAD, Revit, and Hevacomp. We prioritise safety, comfort, and efficiency in every project, offering end-to-end services from technical design to installation and ongoing support.Our collaborative approach ensures seamless integration with other trades, while our commitment to innovation and quality has earned trust from clients including banks, hospitals, universities, and major contractors. Backed by a network of trusted partners, we provide flexible project delivery options to meet diverse client needs.
Services
Heating Systems
Ventilation Systems
Air Conditioning
Water Services
Sanitary Systems
Design & Build
Project Management
Refurbishment
Mechanical Installation
Technical Support
Highlights and features
- We have over 40 years of experience in mechanical services engineering.
- Our team utilises advanced design software like CAD and Revit.
- We offer end-to-end project management from design to installation.
- Our solutions prioritise safety, comfort, and energy efficiency.
- We collaborate with trusted partners to deliver comprehensive services.
What people say
Timely and competitive quote
Finished quality is superb
A* service
Excellent project management
Innovative solutions
Services
HVAC Installation
We design and install custom heating, ventilation, and air conditioning systems for commercial and industrial spaces. Our solutions ensure optimal climate control, energy efficiency, and compliance with safety standards. Projects range from small modifications to large-scale Cat A/B fit-outs.
Mechanical Design
Using CAD, Revit, and Hevacomp software, we create detailed mechanical designs tailored to client needs. Our designs integrate seamlessly with building infrastructure, ensuring functionality, safety, and long-term performance across diverse sectors.
Refurbishment Projects
We specialise in Cat A/B office fit-outs and refurbishments, modifying existing systems to suit new layouts. Services include fan coil unit upgrades, ventilation adjustments, and integration of modern mechanical solutions into legacy infrastructure.
Water Systems
Our water system installations cover hot/cold water supply, sanitation, and industrial process piping. We work with materials like steel, copper, and solvent-welded plastics, ensuring durability and compliance with regulatory standards for commercial and residential properties.
Project Management
We manage mechanical projects from concept to completion, coordinating with architects, contractors, and consultants. Our approach ensures timely delivery, budget adherence, and seamless integration of HVAC, plumbing, and electrical systems through trusted partner networks.
Questions
What sectors does Callisia specialise in?
We serve commercial, industrial, and public sector clients, including banks, hospitals, universities, and office-based businesses.
Do you handle both new builds and refurbishments?
Yes, we deliver solutions for new constructions, Cat A/B fit-outs, and complex refurbishments across the UK.
What design tools do you use?
We utilise CAD, Revit, and Hevacomp software for precise mechanical design and system integration.
Can you manage large-scale projects?
Yes, we handle projects from small modifications to £200k+ installations, with dedicated project management support.
How do you ensure project quality?
Our engineers combine 40+ years of experience with rigorous quality checks and collaboration with trusted contractors.
Do you offer ongoing support after installation?
Yes, we provide technical support and maintenance services to ensure long-term system performance.
