When building a summerhouse, getting things right from the start can save you a lot of time, money, and frustration down the line. Skipping key steps might seem like a shortcut, but it often leads to structural issues, costly repairs, or a summerhouse that doesn’t last as long as it should.

One of the most important, but often overlooked, parts of the build is the summerhouse frame. This is the structural support that sits between the walls and the foundation ensuring your summerhouse is stable, level, and built to last.

In this guide, we’ll break down exactly what a summerhouse frame is and why you need one, so you can make the best choice for your build.

What is a summerhouse frame and why do you need it?

A summerhouse frame is the structural base that sits on top of the foundation and supports the entire summerhouse. It’s what keeps the structure stable, level, and secure over time. Without it, the summerhouse would rest directly on the foundation, which can lead to uneven weight distribution, sagging floors, and long-term structural issues. In wet, rainy climates like the UK, a summerhouse frame lifts the whole structure off the ground which reduces moisture buildup by improving the airflow. Having a solid frame in place makes the rest of the assembly much easier too because everything is level from the start.

Most summerhouse frames are made from pressure-treated wood, which is designed to withstand moisture, rot, and insect damage. Pressure treatment involves infusing the wood with preservatives, making it far more durable than untreated timber. This is important because the frame sits closest to the ground, where it’s exposed to moisture and potential decay.

It’s easy to see why having a solid frame is so important. Yet, surprisingly, not all summerhouses come with one. Many providers leave buyers to figure it out themselves. That’s why it’s always worth checking what’s included before purchasing. However, all summer house models at Summerhouse24 come with a pressure-treated Nordic Spruce frame included, so you don’t have to worry about sourcing or building one separately.

Summerhouse frame vs foundation: What’s the difference?

It’s easy to confuse a summerhouse frame with a foundation, but they serve different purposes.

The foundation

The foundation provides ground support. This is the base that supports the entire structure. It can be made from concrete, pile screws, paving slabs, or breeze blocks, for example.

The frame

The frame sits on top of the foundation and acts as a stable, level platform for the summerhouse to be built on. It’s sandwiched between the foundation and the summerhouse.

How do they work together?

You must have both a foundation and a frame. The foundation keeps the structure from sinking or shifting, while the frame keeps everything level and stable. Together, they create a strong, long-lasting build.

How to build a summerhouse frame (DIY guide)

If you’re planning to build your own summerhouse frame it’s important to get it right. There are lots of DIY videos online to help you, but here are the basic steps:

1. Choose the right wood: The best option is pressure-treated timber, which resists moisture, rot, and insect damage. Avoid untreated wood, as it won’t last as long, especially in damp conditions.
2. Measure and cut the frame: Measure the exact dimensions of your summerhouse base and cut the outer frame pieces to size. Screw the pieces together and square the frame by measuring the diagonals.
3. Secure the joists: Place support joists inside the frame to distribute weight evenly. The spacing depends on your summerhouse size, but 400-600mm apart is a common guideline. Secure them with screws or brackets for added strength.
4. Attach the frame to the foundation: The exact method depends on the type of foundation you’re using, but this step will ensure that the frame stays in place and doesn’t shift over time.
5. Check the frame is level: Use a spirit level to make sure the frame is perfectly flat and adjust where necessary. Don’t skip this step as a wonky frame will cause major issues later!
6. Use moisture protection: Even if you’re using pressure-treated wood, applying sealant or wood preservative adds extra protection. Consider using a damp-proof membrane under the frame for extra moisture resistance too.
7. Final check: Before moving on with your summerhouse build, double-check that the frame is securely attached to the foundation and that the surface is level – you can never check this too many times!

Not a DIY enthusiast? Here’s an easier option…

Building a summerhouse frame from scratch isn’t for everyone. It takes time, effort, and the right tools, not to mention the risk of costly mistakes if things aren’t properly measured or secured. For those who prefer a hassle-free option, some summerhouse providers offer pre-made frames that take the guesswork out of the process.

For anyone looking to save time and avoid the complexities of DIY, choosing a summerhouse that comes with a high-quality frame included can make all the difference.

Last thoughts

When investing in a summerhouse, it’s easy to focus on the design, size, and features, but what’s underneath it matters just as much. A well-supported summerhouse will stay standing strong for years to come.

If you have any questions about our summerhouse frames, don’t hesitate to reach out to the Summerhouse24 team.