How to Choose Doors for Summerhouses: A Practical Guide

The door on a summerhouse does more than let you in and out. It affects how the building looks, how well it keeps out the weather, and how long it lasts before it needs replacing. Choosing the right door from the start means fewer problems later.

This guide covers the key things to think about: size, timber quality, construction method, and glazing options.

Standard Sizes vs Made to Measure

Most summerhouse doors come in a small number of standard widths and heights. At Poulton Portables, standard doors are available in widths of 565mm or 740mm, with heights of either 1800mm or 1880mm. These sizes suit the majority of garden buildings.

If your summerhouse is non-standard or you want a wider opening, made-to-measure doors are available. Expect to pay a small premium for sizes outside the standard range. It is worth measuring your frame carefully before ordering, as even a small error can cause fitting problems.

The choice between single and double doors often comes down to what you use the building for. A single door is fine for a general-use summerhouse, but if you plan to bring in larger furniture or use the space as a home office, double doors make access much easier. Double doors also let in more light and give the front of the building a more open, welcoming feel.

Browse the full range of summer houses to see how different door configurations look in practice.

Timber Quality: Why It Matters

Not all timber doors are built the same way. The quality of the wood and how it is processed has a big effect on how the door performs over time.

Slow-grown timber is denser and more stable than fast-grown alternatives. It holds fixings better, resists moisture ingress more effectively, and is less prone to warping as the seasons change.

Engineered, finger-jointed, laminated stiles are now considered the best choice for door frames in outdoor buildings. Rather than using a single piece of timber for the vertical sides of the door (the stiles), finger-jointing bonds shorter lengths together under pressure. This produces a stile that is more dimensionally stable than solid timber, reducing the likelihood of twisting or bowing when the wood gets wet or dries out. At Poulton Portables, all door stiles are manufactured this way.

You can read more about how timber quality affects outdoor buildings on the timber cladding options page.

Door Construction: Mortice and Tenon vs Dowelled

This is one of the most important differences between a well-made door and a cheap one, but it is rarely mentioned in product listings.

A mortice and tenon joint cuts a shaped slot (mortice) into one piece of timber and fits a shaped tongue (tenon) from another piece into it. When glued, this joint holds firmly and resists racking (the tendency for a rectangular frame to pull into a diamond shape over time). Doors built this way are structurally sound and designed to last.

A dowelled door uses small wooden pegs (dowels) inserted into drilled holes to hold the frame together. Dowels are quicker and cheaper to produce, but they do not lock the frame against racking in the same way. Over time, especially in a garden building that gets wet and then dries out repeatedly, dowelled doors can become loose at the joints.

At Poulton Portables, all doors are properly glued, morticed, and tenoned, not just dowelled.

The table below summarises the main differences:

Glazing Options: Single vs Double

Glazed panels in a summerhouse door let in natural light and make the space feel less enclosed. The choice between single and double glazing affects both warmth and cost.

Single-glazed doors are available in 34mm thickness. They are lighter, simpler to make, and cost less. If your summerhouse is used mainly in warmer months and you are not heating it regularly, single glazing may be perfectly adequate.

Double-glazed doors are built to 44mm thickness and use a 4-6-4 unit (4mm glass, 6mm cavity, 4mm glass). They retain heat better and reduce condensation on the interior surface. If you use your summerhouse as a year-round garden office or hobby space, double glazing is worth the additional cost. The Glass and Glazing Federation provides a useful explanation of how energy-efficient glazing works and what the benefits are.

One thing to look out for with glazed doors is the construction of any glazing bars. Some manufacturers use dummy bars glued onto the surface of the glass to create a Georgian or divided-pane look. These bars sit proud of the glass, collect moisture, and encourage mildew. Properly fitted glazing bars are set into the frame and divide the glass itself. At Poulton Portables, Georgian sash windows use proper glazing bars, not surface-applied spars.

Additional Options Worth Knowing About

When ordering summerhouse doors and windows, there are a few upgrades that can improve how the door performs:

Meeting stile rebates add a small step to the join between double doors. This reduces draughts and creates a tighter seal when both leaves are closed.

Stormproof rebates all round add a full rebate to all four edges of the door. This is a more weatherproof option and suits buildings in more exposed positions.

Both options add a modest cost to the door price but make a noticeable difference in how well the door seals.

Quick Checklist Before You Buy

Before placing an order for doors for your summerhouse, it is worth running through a few key questions:

• Does the door size match your frame opening, including any tolerances?
• Are the stiles made from engineered, finger-jointed timber?
• Is the door morticed and tenoned, or just dowelled?
• Do you need single or double glazing based on how you use the building?
• Are the glazing bars structural or surface-applied?
• Do you want meeting stile rebates or stormproof rebates for a better seal?

Getting clear answers to each of these before you buy will help you avoid the most common issues with summerhouse doors and make a choice that lasts.