Great experience. Engineer lovely, friendly, efficient. The engineer went the extra mile, helping us with an additional task that probably was not within his remit - which we were very grateful for. H... See more
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Review summary
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Company details
- #3 of 4 best companies in Contractor
- #3 of 9 best companies in Electrical engineer
- #1 of 6 best companies in Lift Service
- #3 of 10 best companies in Environmental Service
- #2 of 7 best companies in Fire alarm supplier
- #1 of 6 best companies in Fire protection consultant
Written by the company
Complii is a leading integrated provider of safety and regulatory compliance services across water and air, fire and security, electrical, and lifts and escalators. We support teams across complex, multi-site estates throughout the UK. As a trusted compliance partner, we work across many sectors, including hospitality, leisure, healthcare, education, retail and commercial property to reduce risk, assure regulatory compliance, and protect people, businesses and assets. Delivered through specialist divisions, our services provide high-quality, reliable outcomes. By consolidating multiple compliance disciplines under one trusted partner, Complii reduces supplier fragmentation, providing clear, comprehensive, cost-effective solutions all in one place. We simplify complex compliance legislation, providing you with assurance and confidence that compliance is being managed effectively. Working side by side with our clients, we deliver essential risk, regulatory, and compliance services across the built environment – helping to meet obligations, protect assets and reputations, and ensure the safety of customers and your workforce. From assessment and advice through to servicing, testing, and ongoing support, we focus on quality. We’re not just a supplier – we’re your trusted compliance partner, offering clarity, control, and peace of mind. We’re by your side, every step of the way.
Your Trusted Partner for Building Compliance
Written by the company
- By your side, every step of the way.
- We’re your trusted partner, here to help you navigate the often complex and confusing regulations surrounding building compliance. We work alongside your business, and the challenges you face, to provide end-to-end cost-effective solutions to meet all your building compliance needs. We pursue the highest standards and embrace continuous improvement in everything we do, helping to cultivate lasting relationships with our customers built on reliability and respect.
Contact info
85 Great Portland Street, W1W 7LT, London, United Kingdom
- 0330 043 4344
- trustpilot@complii.com
- www.complii.com
4.9
Excellent
227 reviews
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Excellent Service
Used this company a few years now. Always straight forward, prompt and professional.
22 June 2026
Reply from Complii
Hi Dan,
We're so glad you've had consistently positive experiences with us over the years! Thank you for your kind words.
Best wishes,
Complii
Proffesional and engaging
Site assessor was very proffesional and engaging, interacted well with all department managers and teams, demonstrated both knowledge and constructive guidance for areas of concern or review.
15 June 2026
Reply from Complii
Hi Kerry,
We are so glad to hear about your positive experience with our site assessor. We appreciate you acknowledging their professionalism and engaging approach. Thank you for your wonderful feedback.
Best wishes,
Complii
Reply from Complii
Hi Deb,
We're happy to hear that our team provided such efficient service. Thank you for your kind words.
Best wishes,
Complii
Phil Lloyd was very polite and carried…
Phil Lloyd was very polite and carried out the work on site fast and professionally.
22 June 2026
Reply from Complii
Hi,
We're glad our team was polite and completed the work quickly and professionally. Thank you for your feedback, we'll let Phil know what a great job he did!
Best wishes,
Complii
Very happy with the service we recieve
Very happy with the service we recieve, contractor is regular who attends each month for our legionella testing. Courteous and well presented. Lets us know if any problems straight away. Works round a busy veterinary hospital and doesnt get in the way.
22 June 2026
Reply from Complii
Hi Laura,
We're so glad to hear you're happy with our service and the professionalism of our contractor. We appreciate your kind words and positive feedback!
Best wishes,
Complii
excellent
excellent, he knew what he was doing and got on with the job without any disturbance to staff or guests.
18 June 2026
Reply from Complii
Hi Gemma,
We're delighted to hear our service was excellent and completed efficiently without disturbance. Thank you for your kind words!
Best wishes,
Complii
Steve and Nick
Steve and Nick, have been PAT testing our site.
They have been very good at working around our classes, and events to complete the job.
Communications throughout haves been 100%.
Thanks again.
8 June 2026
Unprompted review
Reply from Complii
Hi,
We're so glad to hear our team successfully worked around your schedule and that our communication was 100%. Thank you for your kind words!
Best wishes,
Complii
Good and helpful member of staff &…
Good and helpful member of staff & helped keep the factory flowing
19 June 2026
Reply from Complii
Hi Jon,
We're so glad our team member was helpful and kept things running smoothly. Thank you for your kind words!
Best wishes,
Complii
michael mitchell was very professional…
michael mitchell was very professional and completed all the testing we required. would recommend and will use again.
19 June 2026
Unprompted review
Reply from Complii
Thank you for your great feedback.
We are really pleased to hear that Michael provided a professional service and completed all the testing to your satisfaction. It’s fantastic to know you would recommend us and plan to use our services again.
We’ll be sure to pass your comments on to Michael. We look forward to working with you again in the future.
The Complii Team
Excellent service
19 June 2026
Reply from Complii
Thank you, Tanya, for your kind feedback.
We are delighted to hear you received excellent service from Izabela. We will be sure to pass on your comments - she will really appreciate it.
Thank you again for your support, and we look forward to assisting you again in the future.
The Complii Team
Was great and does quickly and…
Was great and does quickly and effectively. Would recommend
19 June 2026
Reply from Complii
Thank you for your feedback.
We’re really pleased to hear that Craig provided a fast and effective service and it’s great to know that you’d recommend Complii. We will pass on your comments on to Craig.
We appreciate your support and look forward to working with you again in the future.
The Complii Team
Great professional and friendly service
19 June 2026
Reply from Complii
Thank you for your kind feedback Sarah.
We’re delighted to hear that Phil provided a great, professional, and friendly service. We will share your comments with him. Thank you again for your support, and we look forward to working with you again in the future.
The Complii Team
Friendly and quick
19 June 2026
Reply from Complii
Thank you for your feedback Sam.
We’re pleased to hear you found our service friendly and quick - exactly what we strive to deliver every time. We appreciate your support and look forward to assisting you again in the future.
The Complii Team
Jason was really good polite and respectful
Jason was really good he found the problem and fixed it explaining what he was doing all the way through
18 June 2026
Reply from Complii
Thank you for your great feedback Michelle.
We’re really pleased to hear that Jason provided such a positive experience. It’s great to know he was able to identify and resolve the issue while keeping you informed every step of the way, all with a polite and respectful approach.
We will pass your kind comments on to him. We appreciate your support and look forward to helping you again in the future.
The Complii Team
Amazing service with little to no…
Amazing service with little to no disruption to our daily workload, Kept up to date throughout the whole process discussing any issues that needed addressed. Polite and professional service
18 June 2026
Reply from Complii
Thank you for your feedback Stuart.
We’re delighted to hear that the service was delivered with minimal disruption to your daily workload - that's something we always aim to achieve. It’s also great to know you felt well-informed throughout the process and that our team’s polite and professional approach stood out.
We really appreciate you taking the time to share your experience and look forward to supporting you again in the future.
The Complii Team
Job was done efficiently and well
18 June 2026
Reply from Complii
Thank you for your feedback Karen.
We’re pleased to hear that the job was completed efficiently and to a high standard. Delivering reliable and effective service is always our goal.
We appreciate your support and look forward to working with you again.
The Complii Team
Gentleman was really efficient
Gentleman was really efficient, quick and polite. Knew his beans and cracked on with the job.
18 June 2026
Reply from Complii
Thank you for your feedback Ben.
We’re really pleased to hear that you found the service efficient, quick, and polite. It’s great to know our team’s expertise and proactive approach made a positive impression.
We appreciate you taking the time to share your experience and look forward to supporting you again in the future.
The Complii Team
Parr Fire PAT
Excellent and professional service.
Competitive price.
Fast response.
16 June 2026
Unprompted review
Reply from Complii
Thank you for your great feedback.
We’re delighted to hear you found our service excellent, professional, and competitively priced. Providing a fast and reliable response is something we always strive for, so it’s fantastic to know this made a difference to your experience.
We really appreciate your support and look forward to working with you again.
Reply from Complii
Thank you for your feedback. We’re really pleased to hear you had such a friendly experience with our team. We always aim to bring a positive and approachable attitude to everything we do.
It’s great to know that came across, and we look forward to supporting you in the same way moving forward.
Wonder service
We have used Complii now for a number of years to look after all our compliance needs. The service we receive is outstanding, our contact Chris Mizen is so helpful and will always go the extra mile to support no matter what the problem is, i would highly recommend the services of Complii.
17 June 2026
Unprompted review
Reply from Complii
Thank you for your feedback and continued trust in Complii over the years.
We’re delighted to hear that you’ve had such a positive experience with our service, and it’s especially great to know that Chris has been able to support you so effectively. We’ll be sure to pass on your feedback to him.
Providing reliable, responsive support to help our clients navigate their compliance requirements is at the heart of what we do, so it’s fantastic to see that reflected in your experience.
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