Single-storey extension: what to charge in 2026

Understanding Pricing for a Single-Storey Extension

Knowing how to price a single-storey extension can significantly impact profitability. In 2026, the average rate you might charge ranges from £1,000 to £1,500 per square metre for labour. This figure varies depending on the complexity and scope of the project, as well as regional factors.

When estimating costs, also consider the materials needed, which can add another 30 to 50 percent to the overall price. For instance, if you’re working on a 3m by 4m extension, you might be looking at a total cost of £12,000 to £18,000, factoring in both labour and materials.

Regional Variations

Pricing for extensions can differ significantly across the UK. London typically commands a premium due to higher living costs and demand. Here’s a quick overview of what you might charge in different regions:

• London: £1,200 to £1,800 per square metre
• South East: £1,100 to £1,600 per square metre
• Midlands: £1,000 to £1,500 per square metre
• North: £900 to £1,400 per square metre

Understanding these regional differences helps position pricing effectively.

Factors Influencing Costs

Several factors can affect the final price of a single-storey extension. Here are some common triggers for scope creep:

1. Design Changes: Clients may request changes after the project starts, affecting time and materials.
2. Site Conditions: Unexpected issues like poor soil conditions can require additional work.
3. Regulatory Requirements: Local building regulations may necessitate changes to the original plan.
4. Utilities: Relocating existing utilities or installing new ones can increase costs.
5. Finishes: High-end finishes or bespoke features will require more time and materials.

Building Your Quote

Creating an accurate quote for a single-storey extension involves more than just calculating square metres. Here’s how to break it down:

• Measure the area: Calculate the total square metres.
• Estimate labour costs: Use the £1,000 to £1,500 per square metre range based on your location.
• List materials: Include costs for bricks, roofing, insulation, and fixtures.
• Add contingency: Include a buffer for unexpected expenses, typically around 10-15%.

Using tools like Pencl can simplify this process. It helps document estimates, track changes, and ensure all bases are covered in your quote.

Conclusion

Pricing a single-storey extension in 2026 requires careful consideration of various factors. By being aware of regional differences, understanding scope creep triggers, and using tools like Pencl, you can provide accurate and competitive quotes that reflect expertise and the quality of work.