Cornerstone Group

Cornerstone Group is based in London and works exclusively with businesses in the built environment, covering construction, manufacturing, architecture and design, building materials, building services, interior design, fit out, residential developers and commercial property. The team is small, sized 1-10, and describes construction as its flagship sector. Rather than presenting as a generalist marketing agency, it positions itself as a specialist that understands how firms in these trades operate and buy, with a case study citing a 315% peak organic traffic lift for a client called Terrazzo Tiles. The agency also states it has worked "behind the lens" since 2010, giving it a background in photography and video alongside its digital work. Services are organised into two groups: creative and digital. On the creative side, this includes web design focused on site speed and cross-device performance, video production, photography, and 360 virtual tours. On the digital side, services cover SEO, AI SEO (aimed at ensuring a brand is recommended by AI-driven search rather than just ranking on Google), digital PR, email marketing campaigns and flows, conversion rate optimisation for sites with weak visitor-to-customer conversion, paid social advertising, and Google Ads management. The agency describes offering 30-day rolling agreements rather than long-term lock-in contracts, and frames its approach as combining design, build, growth and showcase functions under one team so that a client's marketing activities work toward a single strategy.