A Leading National TIC Sector Service Provider

Approved Consultant Services

Our Expertise Is Offered With Excellent Value And Speed Of Service

Approved Consultant Services (ACS) are leading providers of Latent Defect and Inherent Defect Insurance Warranty Auditing and Clerk of Works delivery across the UK, Channel Islands and Ireland. Widely recognised as one of the UK’s leading providers of full compliance, assurance and quality of workmanship services to clients across all commercial, residential, private and institutional sectors. With compliance backed by decades of industry experience and successful service delivery, ACS continues to champion the Testing, Inspection and Compliance (TIC) sector.

Professional Construction Quality Control
Trusted Partnerships with Years Experience
A Team of Fully Qualified Nationwide Surveyors

ACS provides a solid foundation of expertise which is successfully applied to niche market sectors to create added value that is invaluable.

Clerk of Works
CoW services delivered across the UK
Industry Sectors
Across multiple sectors within construction
Structural warranties approved and provided

Completed by our expert

what we offer

Our Core Services

ACS has years of experience in a wide range of construction consultancy services. Our core services are Inherent Defect Warranty Auditing and Clerk of Works. We work with both small scale ‘self build’ projects and large ‘Developers’. Services can help with all aspects of your construction project, from initial planning to final completion.

Clerk of Works Services

At ACS, our Clerk of Works services support the Golden Thread Construction. Our CoW will be responsible for inspecting the workmanship, quality and safety of work on construction sites and reports back to senior managers and clients. Our CoW conducts regular site inspections and checking that building plans are being followed correctly. We check that work is being carried out to the correct specifications and legal, safety and environmental standards. We endeavour to deliver the highest possible quality of service. This is why we encourage all our Clerk of Works to achieve and maintain professional accreditation by the institute of Clerk of Works and abide by the ICWCI Code of conduct.

Inherent Defect Warranty Auditing

Underpining UK construction in residential and commercial markets, a new build warranty is almost always a prerequisite of the construction process as required by Lenders, Funders, Developers and end user Mortgage providers. Warranties also referred to as a structural warranty, inherent defect warranty or latent defect warranty are typically a 10 year or 12 year insurance product, CML approved, backed by A rated insurers regulated as part of Lloyds of London. As part of the warranty process, ACS will inspect the project at various key stages in order to review and ensure compliance to regulations and building warranty standards. At completion of the project, ACS will work with the project beneficiaries to approve the warranty with the UK warranty providers.

let's work together

Get In Touch With Us

If you’re looking for Clerk of Works services, or Warranty Auditing, call today and talk to one of our specialists. Alternatively fill in our contact form and we’ll get back to you shortly. 

Call our team on:

16-19 Eastcastle Street,

Fitzrovia, London, W1W 8DY

Write to us


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Past Projects

We are driven to deliver the best possible experience for our clients, through our commitment to leadership, excellence in craft, and attention to detail. No project is too big or small, we work with many types of projects. 

Customer Testimonials

Here’s What Our Customers Say About Us

Matt HiggsMatt Higgs
15:52 25 Jun 24
I had 3 new builds, with ACS/BZ , my go to was Mohammad Azan who was extremely helpful throughout the project made life easier throughout
Sandy De putron-HillSandy De putron-Hill
10:02 21 Mar 24
Re: 2 x New BuildsWe had a few issues with the paperwork side of things but Tiffany went all out to get things back on track and made sure everything got ticked off. Tiffany was always there at the end of the phone to help us out and take some of the stress away. ACS, you are very lucky to have her!Thank you Tiffany, we got there in the end!
Tracy JonesTracy Jones
19:42 09 Mar 24
Really Great experience with this company. Mohummed Azaan was so very helpful with a matter I was stuck on and he managed to get to help me solve it - thanks so much
Paul HarveyPaul Harvey
15:20 03 Mar 24
My ACS office was London and most of the time I dealt with Joyce Bikala.My interaction with Joyce was excellent. Joyce:1. 9 times out of 10 answered the phone when I rang instead of me leaving message.2. Helped me with questions very efficiently.3. If answer wasn't known Joyce went away and put me in contact with correct person.Site agents were fantastic and helpful.I would recommend and/or use ACS again.
Laurence TurnerLaurence Turner
10:55 17 Jan 24
I used ACS in London for all my building reg needs during my self build. Prior to this, I had no ideas what I was doing and did not even realise you could appoint a private Building Reg. They guided me every step on the way, I could speak to someone over the phone very easily and found them very responsive and customer service orientated. Their surveyor was also very approachable, and on the ball. Highly recommend !
Hannelie BauerHannelie Bauer
14:13 16 Jan 24
We worked with Approved Consultant Services last year and found the Customer Services team provided an excellent service. They were very helpful and always happy to go above and beyond to get our site visits sorted and to provide us with our reports.
Customer Services

Some Frequently Asked Questions

How do I contact the customer services team
Whilst we always strive to provide excellent service to all of our customers and clients. If you feel that our service is not meeting your expectation, please tell us about it and a member of the team will review your concerns and resolve any issues you may be having with our service. Contact Customer Services directly and we will be able to assist in resolving these concerns for you.
Where can I find your downloadable resources?
Check out our main FAQs and downloads page, we have listed our most recent downloadable documents and other customer resources.
Do you operate nationwide?
Yes, of course. We have surveyors working across the country, covering all areas. Our head office is in London, and we have a second office in Manchester, however most of work is done on at the clients project site.
Do you offer a free, no obligation quotation?
Yes. For a quote, all you need to do is reach out to us. Ideally a phone call will provide you with the most accurate answers. Sometimes we can give you an idea of cost over the phone, however sometimes we are required to visit the site.