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Our Architectural Design Process

How RKN Architectural Works

For many of our clients, it is their first time at designing their home extension, which can be a daunting task. To assist clients, our designers provide a clear process from which to guide you from inception of the project through to completion of your home extension.






Building Control Submission


We provide an initial site meeting to discuss in detail the design brief with the client, this includes guide costs and timescales to aid with the decision making. A detailed design brief will be prepared following the consultation with one of our Architectural Designers in which to set the grounds for the design of the works.


Measured Survey and existing building plans and elevations

Following the initial meeting, and clarification of the brief we then conduct a measured survey of the existing property including drainage and photographic evidence. The existing building plans and elevations of the property are then prepared, from which the first draft proposals will be drafted.


Conceptual Design

Prepare first draft proposal in accordance with client brief. A meeting will be arranged on completion of the proposed architectural plans and elevations to review the proposal and annotate any changes to the plans where required. At this stage, we will undertake preliminary budget costings based on the building cost information service, along with advice on structural and party wall matters where appropriate.


Developed Design

Following the conceptual design stage, architectural plans are then refined to include amendments as per the annotations taken from the conceptual design stage where necessary. Preparation of additional information for the planning submission will be provided at this stage, including site location plans, block plans, and roof plans. Where a project is based within a conservation area or is a listed building, this stage will also involve the preparation of a design and access statement along with a heritage statement.
It must be noted that whilst we maintain good working relationships with planning officers, we cannot guarantee approval of the planning application.

Building Control Submission

Upon consent of the planning application, the detailed architectural drawings will be prepared for building regulation approval with the purposes to provide the chosen contractor with sufficient information to build the approved design within current building regulation standards.

This will generally consist of the following:

  • Liaising with the appointed structural engineer to prepare the structural overlay for submission
  • Preparation of waste water and surface water drainage layouts
  • Preparation of plans and sectional details to illustrate foundations, walls, roof, insulation, ventilation
  • Preparation of plans and sections to issue to third party utility companies for review if building over or close to a public sewer
  • Submission of detailed plans and calculations to chosen building control department for inspection