What Drawings Do I Need for a Single-Storey Extension?

The answer isn’t as simple as a single set of drawings. Your project will typically require a few different types of drawing packages, each serving a specific and essential purpose. Understanding these will give you clarity and confidence, ensuring your project is compliant, buildable, and exactly what you envisioned.

Here’s a simple breakdown of the drawings you’ll likely need:

1. The Initial Check: Lawful Development Certificate (LDC) or Planning Drawings

Before a single brick is laid, you need to ensure your project has the legal green light. For most single-storey extensions, the first step is to determine if it falls under your Permitted Development rights.

What they are: A set of precise drawings (existing and proposed floor plans, elevations, and a site plan) submitted to your Local Authority.

Their purpose:

LDC Drawings: These prove that your extension is compliant with Permitted Development rules and does not require a formal Planning Application. While optional, an LDC is invaluable as legal proof when you sell your property.

Planning Drawings: If your extension doesn't meet the Permitted Development criteria, a formal Planning Application is required. These drawings demonstrate to the council that your proposal is suitable for the site and the local area.

This is the stage where we take your initial measurements and photos to develop a clear and detailed scheme that defines the scope of your project.

2. The How-To Guide: Building Regulations Drawings

Once you have the go-ahead from the council (either via an LDC or Planning Permission), the next step is to ensure your project is safe, energy-efficient, and structurally sound.

What they are: A comprehensive set of technical drawings and notes that detail how your extension will be built to comply with the Building Regulations.

Their purpose: This package is the builder's bible. It specifies everything from the type of foundations and wall construction to insulation, drainage, ventilation, and fire safety. These drawings are a legal requirement for your project and must be approved by a Building Control body before work can start.

This is where the meticulous detailing comes to life. My role here is to translate your approved design into a technical roadmap that leaves no room for guesswork on site.

3. The Builder's Roadmap: Construction Drawings

While Building Regulations drawings provide the minimum legal requirements, an additional set of detailed Construction Drawings can make a huge difference to your project's smoothness and final quality.

What they are: An even more detailed set of plans that specify construction elements, junctions, and material specifications beyond what is required for Building Regulations approval.

Their purpose: These drawings are designed to streamline the build process for your contractor. They provide the most detailed possible instructions for complex areas, reducing on-site questions and potential errors, which in turn saves both time and money.

Putting It All Together

Navigating the world of architectural drawings can seem daunting, but it doesn't have to be. As an Architectural Technologist, my expertise lies in preparing all of these precise drawing packages for you. By working with me remotely and providing the initial measurements, you can significantly reduce costs without compromising on clarity or quality.

Ready to start your project with clarity and confidence? Get in touch today for a free consultation to discuss your single-storey extension and find out exactly what drawings you'll need.