Oak-Framed Annexe Conversion
Walton on the Hill ~ Dorking
Building Regulations and structural design for a distinctive vaulted conversion of a Listed Building in Walton-on-the-Hill
This substantial existing outbuilding in Dorking was converted to create a characterful, self-contained annexe arranged around a dramatic exposed oak frame.
Your Home Plans was appointed to prepare the Building Regulations drawings and coordinate the structural calculations required to turn the proposed conversion into a practical and buildable scheme.
CIAT Chartered Practice · Established 2007 · Chichester & Surrounding Areas
The project brief
The client wanted to convert the existing building while retaining its character and making the most of the generous roof space.
A principal part of the brief was the introduction of an oak frame. This needed to provide genuine structural support to the vaulted roof while remaining exposed as an important feature within the completed interior.
The technical design therefore had to bring together the existing masonry building, altered roof construction, new accommodation and bespoke oak frame as one coordinated structure.
Structure intended to be seen
The oak frame was never intended to be concealed behind the finishes. Its posts, beams and braces would remain visible throughout the principal living space and become one of the defining features of the annexe.
This meant that the structural arrangement needed to satisfy two requirements simultaneously: it had to support the roof and new work properly, but it also needed to create a balanced and attractive rhythm within the room.
The frame was coordinated with the floor layouts, vaulted ceiling, rooflights, openings and circulation so that the structural members formed a natural part of the completed accommodation.
Developing the Building Regulations drawings
Detailed drawings were prepared to establish how the existing building could be upgraded and converted. The package considered the new floor arrangements, roof structure, insulation, ventilation, fire safety, drainage and junctions between the existing masonry and new construction. The structural information was incorporated as the design developed, allowing the oak frame, roof and supporting elements to be considered together.
Retaining the character of the building
Externally, the conversion retained the simple agricultural character of the original brick outbuilding. Existing openings and roof forms continued to define its appearance, with sensitive alterations allowing the building to accommodate its new use.
Inside, the approach was deliberately more expressive. The full height of the roof, exposed oak structure and carefully positioned rooflights create a spacious interior that feels closely connected to the history and form of the building.
A vaulted interior shaped by the oak frame
The completed annexe contains a generous open-plan kitchen and living area beneath the exposed roof structure. Oak posts and beams divide the long interior without enclosing it, allowing the kitchen, dining and seating areas to remain visually connected. The frame also supports the upper-level accommodation and gallery, creating views through the building and emphasising the height of the vaulted space.
Natural brick, painted surfaces, dark cabinetry and warm timber finishes complement the oak without competing with it.
Technical design supporting creative interiors
The client is an interior designer and developed the completed finishes, fitted furniture and decorative scheme.
Your Home Plans’ role was to provide the technical and structural foundation that allowed those ideas to be realised safely and successfully.
The completed photographs show how careful Building Regulations and structural coordination can support an interior with considerable individuality and character.
Key elements of the project
Conversion of an existing outbuilding
The original building was upgraded and reorganised to provide comfortable self-contained accommodation while retaining its established character.
Exposed structural oak frame
A bespoke oak frame was incorporated to support the altered roof and upper-level construction while becoming the principal feature of the interior.
Vaulted roof space
The existing roof volume was opened up and developed to create a light-filled interior with a strong sense of height.
Coordinated technical design
Building Regulations drawings and structural information were developed together to resolve the roof, floors, insulation, fire safety and connections with the existing building.
The completed home
This project demonstrates how technical design can contribute directly to the character of a finished project. The oak frame is not simply an applied decorative detail: it provides the structure around which the interior is organised. By coordinating its practical and visual roles from the outset, the converted building has retained its original character while gaining a distinctive new life.
All Images Provided by Client ~ Thomas Coombe Design
Planning a conversion or technically demanding renovation?
Existing buildings often present opportunities that are not immediately apparent, but successful conversion depends on understanding how the new use, structure and Building Regulations requirements will work together.
Your Home Plans can prepare and coordinate the technical drawings needed to develop an approved design into a practical construction package.