Collection: T-shape greenhouse

What a T Shape Greenhouse Is

A T shape greenhouse adds a projecting porch or wing to a straight sided frame, forming the letter T in plan. The main run holds the growing space, and the projecting section gives a sheltered entrance with room for staging or seating separate from it.

The shape does something a rectangular greenhouse cannot: it creates two distinct areas under one roof, which can be used differently and, with a partition, ventilated differently.

Two Zones Under One Roof

The usual arrangement puts propagation and working space in the wing and growing in the main run. That keeps compost, tools and trays away from the crops, and it means the part you spend time in is separate from the part that gets hot.

• The wing gives a sheltered entrance, which matters in wind and rain.
• A partition lets one section be held warmer than the other through winter.
• Seating in the wing does not take space from the growing run.

For a house being used partly as a garden room, this is a more practical layout than a single open span of the same floor area.

Ventilation in Two Sections

The T plan needs vents in both parts, and air has to be able to move between them or the wing becomes a dead end where humidity collects. Doors at the end of the main run and in the wing give through ventilation on warm days.

Our vents and louvres cover both sections, and an automatic vent opener in each keeps the cycle running without attention.

Base and Assembly

A T shaped base is harder to lay square than a rectangle, because two runs have to meet at a true right angle. Getting that wrong shows up as glazing that will not seat where the sections join.

Take time over the base, and fit an anchor kit during assembly. The junction between the two runs is the point that takes most load in wind.

Whether It Suits You

A T shape costs more than a rectangle of the same floor area and is more complex to build. What it buys is separation, which matters if the house is doing two jobs.

If it is doing one job, a straight frame gives more usable growing space for the money. The shape guide sets the options against each other.