Square Metre Costs for Domestic Buildings

Chris Parkinson at R&B Building Services says building a home or extension is an exciting prospect, but navigating the world of construction costs can be daunting. One of the most common ways to estimate costs in the UK is by using the “square metre rate.” But what exactly does this mean, and how does it differ between single-storey and double-storey builds?

Understanding Square Metre Costs

Square metre cost refers to the estimated price per square metre of floor area. It’s a handy rule of thumb for builders and homeowners to get a ballpark figure for a project. In 2024, the average new build cost per square metre in the UK sits around £2,387.50 [average building cost per square metre uk].

This figure, however, acts as a starting point. Several factors can significantly impact the final cost:

• Location: Building costs vary considerably depending on your region. London and the South East typically have higher rates than other areas.
• Build type: A detached house will cost more per square metre than a terraced property.
• Materials: High-end finishes and bespoke features will push the price per square metre upwards.
• Complexity of Design: A straightforward design is cheaper than one with intricate details or multiple levels.
• Building regulations and labour costs: These can fluctuate depending on the project’s specifics.

Single Storey vs. Double Storey: Square Metre Cost Considerations

While the square metre rate provides a general estimate, it’s important to consider the number of storeys when calculating costs. Here’s why:

• Single Storey: A single-storey extension, for example, may have a slightly higher square metre cost because the Building Control foundation requirements are still the same as those for a two-storey extension. However, you’ll save money by not needing to construct walls, floors and rooms for a second floor.
• Double Storey: Double-storey builds benefit from spreading the building costs over two floors, potentially lowering the cost per square metre through economies of scale compared to a single-storey extension with the same floor space. However, building a second floor adds complexity with access, stairs etc and a potentially more intricate roof structure.

Remember, It’s an Estimate

The square metre rate is a valuable tool, but it’s just one piece of the puzzle. For a more accurate picture, always consult with a qualified builder, such as R&B Building Services, or an architect. They can assess your specific project details, including size, location, and desired finishes, to provide a more tailored cost estimate.

Getting Started with Your Build

Chris Parkinson says that by understanding square metre rates and the differences between single-storey and double-storey builds, you’re better equipped to navigate the initial stages of planning your dream home or extension. Remember, this is an estimate, so always get professional advice to ensure your project stays within budget.