About us Consultancy RDA provides specialist planning consultancy advice and is a nominated panel member for both Southwark Council and The Dulwich Estate. Our consultancy service provides an integrated support service to ensure that high quality engineers, builders and specialised contractors are appointed to meet the requirements of the design brief. By maintaining a register of RDA approved contractors we’re able to reduce the complexity and concerns that clients may face when undertaking and initiating the build management phase, with RDA capable of handling the various stages of project management as required.