Professional Existing and Proposed Plans for Extensions, Conversions and Property Alterations

Why Existing and Proposed Plans Are Important

Many building projects require drawings before any formal application or building work can begin. Existing and proposed plans give a clear visual explanation of the project, helping local authorities, building control officers, contractors and clients understand exactly what is being changed.

For planning applications, these plans show how the proposed work affects the appearance, layout and scale of the property. For permitted development or Lawful Development Certificate applications, they help demonstrate whether the proposal meets the relevant rules. For building regulation purposes, they provide a base for more detailed technical information.

Having accurate plans prepared professionally can reduce delays, improve communication and help identify potential issues early. Poorly prepared drawings can lead to misunderstandings, requests for additional information or problems once work begins on site.

Existing Plans

Existing plans show the current property before any work takes place. They may include the existing floor layout, external elevations, roof shape, site arrangement, boundaries and key measurements.

These drawings are often prepared following a measured survey, where the property is assessed and recorded accurately. The information gathered is then used to create clear drawings that represent the property as it currently stands.

Existing plans are useful because they provide a reliable starting point for the design process. They allow proposed changes to be compared against the current building and help ensure that any new design is based on accurate information rather than assumptions.

Plans for Permitted Development Projects

If your project may fall under permitted development, existing and proposed plans can help demonstrate that the work meets the relevant limits and conditions. These drawings are often used as part of a Lawful Development Certificate application.

Even where full planning permission is not required, it is still sensible to have professional plans prepared. They create a clear record of the proposed works and can help avoid confusion with builders, neighbours or future property checks.

N.A. Williams Building Consultancy Ltd can prepare drawings for permitted development projects such as single storey extensions, loft conversions, garage conversions, outbuildings and other residential alterations.

Plans for House Extensions

House extensions often require both existing and proposed plans to show how the property will change. These drawings help explain the size, layout, appearance and position of the extension in relation to the existing building.

Whether you are planning a rear extension, side extension, double storey extension or wraparound extension, accurate plans are an important part of the process. They help you visualise the new space and provide the information needed for planning, building regulations or contractor discussions.

N.A. Williams Building Consultancy Ltd can prepare extension plans that are practical, clear and suited to the stage of your project.

Measured Surveys for Accurate Plans

Accurate existing plans often begin with a measured survey. This allows the property to be recorded carefully so that the drawings are based on reliable information.

A measured survey may include room dimensions, wall positions, window and door locations, ceiling heights, external measurements, roof details and other relevant features. The level of detail depends on the project and the drawings required.

By starting with accurate information, proposed plans can be developed more confidently. This helps reduce the risk of errors and gives the project a stronger foundation.

Our Existing and Proposed Plans Service

N.A. Williams Building Consultancy Ltd can provide a complete existing and proposed plans service tailored to your project. This can include an initial consultation, measured survey, existing floor plans, proposed floor plans, existing and proposed elevations, roof plans, site plans and supporting drawings where required.

We can prepare plans for planning applications, permitted development projects, Lawful Development Certificate applications, building regulation submissions and early design discussions.

Our service is clear, reliable and practical. We aim to provide drawings that are easy to understand, suitable for the intended purpose and prepared with attention to detail.