SDM are focused on best practice and achieving the highest standards

We are committed to best practice and achieving the highest industry standards. All our tradesmen are fully qualified and certified. The following accreditations and memberships are testament to the quality and professionalism that underpins our work.

Accreditations & Memberships

Gas Safe

gassafeOpen Website Gas Safe Register is the official gas registration body for the United Kingdom, Isle of Man and Guernsey, appointed by the relevant Health and Safety Authority for each area. By law all gas engineers must be on the Gas Safe Register.


NICEICOpen Website NICEIC is the UK electrical contracting industry’s independent voluntary body. NICEIC offer leading certification services, Building Regulations Schemes, products and support to electrical contractors and many other trades within the construction industry.

Safe Contractor

Safe Contractor LogoOpen Website Safecontractor is the fastest growing health and safety accreditation scheme in the UK, with more than 160 major clients and almost 18,000 contractor members. Registered members with the Safecontractor scheme include clients and contractors from a wide range of professional disciplines working within a number of industry sectors.

Construction Line

Construction Line LogoOpen Website Construction line is the UK’s largest register for pre-qualified contractors and consultants. In terms of efficiency, time and cost saving and best practice, Constructionline is proven to deliver for public and private sector organisations alike. As an accredited contractor SDM can ensure your works follow best practice.



CHAS LogoOpen Website CHAS is established as the market leader for health and safety pre-qualification in the UK. SDM routinely undertake internal health and safety reviews and provide excellent staff training to ensure the safety of both our employees and customers onsite.

Trust Mark

Trust Mark LogoOpen Website TrustMark is a quality mark which operates a framework under which 30 plus scheme operators work in the RMI (repair, maintenance and improvement) sector, including trade associations, local government trading standards teams, and independent scheme operators.


Altius LogoOpen Website Altius are an independent company created to assess and examine contractors


Helifix LogoOpen Website For over 25 years market leader Helifix has been at the forefront of technical innovation in the design and manufacture of construction ties, fixings and sustainable masonry repair systems, with concealed non-disruptive installation techniques, building an enviable reputation for product quality, engineering excellence and comprehensive customer service and support.


PASMA LogoOpen Website Founded in 1974, the Prefabricated Access Suppliers’ and Manufacturers’ Association (PASMA), is the recognised focus and authority for mobile access towers. As such it advances safety, standards and best practice across a wide range of sectors and represents the interests of manufacturers, suppliers, specifiers and users.


Chance LogoOpen Website With both the Chance® and Atlas® brands, Chance Civil Construction is the international leader in earth anchoring. Chance Helical Piles and Atlas Resistance® Piers are used worldwide to secure residential and commercial buildings, tower foundations, heavy equipment foundations and many other deep foundation applications.