Lean To Greenhouse Kits DIY: How to Choose One

On this page (11 sections)

1. What makes a kit a DIY lean to greenhouse?
2. How do you size a lean to greenhouse for your wall?
3. Which frame and cover materials suit home assembly?
4. Where should you place a lean to greenhouse kit?
5. How do you anchor and windproof a kit?
6. What do the kit options cost in time and effort?
7. How should you plan shelves and plant layout?
8. What should you check before you order a kit?
9. How do you keep a DIY kit in good shape?
10. How we chose the kits in this guide
11. Which kit should you pick?

A DIY lean to greenhouse kit is a frame and cover package you assemble yourself against a wall or fence. It gives you a growing space without a full greenhouse build, but the kit only works well when its size, frame and cover suit your spot.

This guide covers what to check before you order, from the wall you'll lean it against to the anchors that keep it in place. It finishes with the kit we would pick for most home gardens and who should choose the alternatives.

If you want the wider comparison first, see our roundup of the best lean to greenhouses for fences and walls.

What makes a kit a DIY lean to greenhouse?

A kit counts as a DIY lean to greenhouse when it arrives as frame parts and a cover you put together yourself, with one open side designed to sit against a wall. The wall becomes the fourth side, so the kit uses less ground than a freestanding tunnel.

The frame is the first thing to check. Plastic joints and tubes suit light kits that you can move, while steel frames carry more weight and hold shelving better.

The Ohuhu uses plastic frame material with thickened tubes and PP plastic joints, which keeps its weight down to 7.7 lb.

The cover matters just as much. Translucent polyethylene film lets light through while holding heat and moisture, and it keeps the kit affordable.

A kit sold as a walk-in tunnel style still needs an open or flat back to sit flush against your wall.

Look at how the kit closes. A zippered door gives full access, while a roll-up door is quicker to open on a warm day.

The Ohuhu pairs a roll-up zippered door with two mesh windows for airflow.

Finally, check what comes in the box. Stakes and guy ropes turn a light frame into something that stays put.

The Outsunny kit includes 4 ground stakes and 4 guy ropes, and both listed kits ask you to place them near a wall to cut wind exposure.

Pick a kit whose frame and cover match your wall, your ground and your wind. Anything else is a frame you'll fight all season.

How do you size a lean to greenhouse for your wall?

Size a kit by measuring the wall length you can spare and the depth you can walk past, not by the growing space you dream of. A lean to greenhouse is long and shallow, so the wall decides your limit.

Start with the wall run. The Ohuhu measures 78.7 in long by 30 in deep by 66.9 in high.

The Outsunny measures 78.75 in long by 39.25 in deep by 84.75 in high. Both need a wall stretch of about 6.6 ft, but the Outsunny stands taller and reaches further into the garden.

Height decides who can work inside. At 66.9 in, the Ohuhu suits a stooping or seated gardener, while the Outsunny's 84.75 in gives standing room for most adults.

Measure the tallest person who will tend the plants.

Depth affects the path beside the kit. A 30 in deep kit leaves a walkway in a narrow garden, but a 39.25 in model blocks more of a patio.

Mark the footprint on the ground with string before ordering.

Also check the door swing and window clearance. A roll-up door needs space above it, and a side window needs room to open.

Leave a gap at each end so you can reach the back corners.

Pick the longest kit your wall allows at the height you need, then confirm the depth still leaves a usable path.

Which frame and cover materials suit home assembly?

The frame and cover decide how the kit assembles, how long it lasts and how much light your plants get. Materials vary between kits, so read the spec before you commit.

The Ohuhu's frame is plastic with PP joints, and its cover is polyethylene. Ohuhu says the PE cover is grid-distributed for tear resistance and UV protection.

It also describes a PVC layer for light transmission and appearance. If you want a clearer, more rigid build, compare glass lean to greenhouse kits, which take longer to assemble but hold their shape.

The Outsunny uses a galvanized steel frame, which Outsunny says helps prevent chipping and peeling. Its cover is polyethylene.

A steel frame can carry the kit's three tiers of shelving, with 6 wire panels rated at 22 lb each.

For a first kit, plastic frames and PE covers are the easier route. They keep the parts light and the assembly short.

Steel and glass kits suit a spot you plan to keep for years.

Match the material to how long the kit will stay in one place, and to how much weight you want on the frame.

Where should you place a lean to greenhouse kit?

Place the kit against a sturdy, flat wall or fence that gets good light and blocks the worst wind. The wall carries part of the load, so its condition matters as much as the kit's.

Check the wall's strength first. A fence panel that flexes in a gust won't hold a tall kit steady.

The Outsunny instructions recommend placing the kit near a wall to reduce wind exposure. A house or garage wall gives the most reliable backing.

Level the ground. A kit assembled on a slope twists out of square, and a twisted frame strains the cover and the door zip.

The Ohuhu needs its stakes pushed in deeply, so soft ground is better than hard paving for that model.

Think about light through the day. A wall that faces the sun all afternoon cooks a small kit fast, while deep shade slows growth.

Aim for several hours of direct light with some shelter from the strongest midday heat.

Leave space for air to move. A kit pressed into a corner traps humid air, and the mesh windows only help when air can reach them.

Clear a gap at both ends and above the roof line.

Pick a flat, sturdy wall in decent light, and keep a gap at each end for airflow.

How do you anchor and windproof a kit?

Anchor a kit with its own stakes and guy ropes plus a secure tie to the wall, because a light cover catches wind like a sail. Wind is the main reason small kits fail.

Use every anchor in the box. The Ohuhu includes stakes and windproof ropes, and Ohuhu says to insert the stakes deeply or install the kit against walls and fences for stability.

The Outsunny includes 4 ground stakes and 4 guy ropes.

Tie the frame to the wall where the design allows. A couple of brackets or straps between the top rail and the wall stop the kit from lifting at the open side.

Use fixings suited to brick, timber or metal.

Check the cover's tie-downs. A cover that flaps loosens its fixings over time.

Re-tension the guy ropes after the first windy week, then check them each season.

Clear the area around the kit. Loose pots, bins and hanging branches become missiles in a gust.

Trim overhanging growth that could scrape the cover.

Patch damage early. A small tear grows once wind gets behind the film.

TapeManBlue's clear repair tape is 6 in wide and 108 ft long, and the company says it resists UV and extreme temperatures. Keep a roll in the shed for quick fixes.

Use every stake and rope, tie the frame to the wall, and patch any tear the same day you find it.

What do the kit options cost in time and effort?

Assembly effort depends on the number of frame parts and the type of cover, not on the kit's price. A small plastic kit goes up in an afternoon, while a tall steel kit with shelves takes longer.

The Ohuhu suits a quick first build. Ohuhu calls it easy to assemble and disassemble, and its 7.7 lb weight means one person can move the parts.

The roll-up zippered door and two mesh windows keep the fitting simple. Expect to spend most of the time levelling the ground and setting the stakes.

The Outsunny takes more work. A galvanized steel frame, two doors, a vented window and six wire panels mean more parts and more fixings.

Outsunny lists assembly as required, and the shelving needs to be set level so the panels carry weight evenly. Plan on a helper for the taller frame.

Think about seasonal changes too. A kit you plan to take down each winter rewards light parts and simple joints.

A kit you leave up all year can justify the extra effort of a steel frame and stronger anchoring.

Pick the lighter kit if you'll move or store it; pick the steel kit if it stays put and you want shelves.

How should you plan shelves and plant layout?

Plan the inside layout before the kit goes up, because a shallow kit leaves little room to rearrange once it's full. Shelves turn a narrow footprint into usable growing space.

The Outsunny includes three tiers of shelving with six wire panels. That gives you stacked growing room without adding freestanding shelves.

Its two roll-up doors and a screened window help you reach the plants and manage heat.

A kit without shelves, like the Ohuhu, needs its own staging. A slim bench along the back wall keeps the floor clear and leaves the front open for tall plants.

Keep the tallest plants near the door so you can water them without crouching.

Group plants by height and water needs. Put low, thirsty seedlings on the upper shelf where you can reach them, and taller tomatoes or peppers on the floor or a lower tier.

Leave a gap between pots so air moves around the leaves.

Check the load on the shelves. The Outsunny's wire panels are rated at 22 lb each, so keep heavy pots on the floor.

A shallow kit also dries out fast in sun, so plan a watering routine for hot weeks.

Set the shelves and the tallest plants first, keep heavy pots on the floor, and leave gaps for air.

What should you check before you order a kit?

Before ordering, confirm the kit's exact dimensions against your wall, ground and doorway, and check the parts list. A kit that won't fit the spot costs you a return and a lost weekend.

1. Measure the wall run, the depth of the path and the height clearance.
2. Confirm the kit's footprint and height match your measurements, allowing for the open door and any window.
3. Check the ground is flat enough to stake into, or plan a level base.
4. Read the parts list for anchors, shelves and windows, since not every kit includes them.
5. Decide whether the kit stays up all year or comes down each season.
6. Note the cover material and plan a repair tape supply.

If you want a kit you can move around the garden instead of fixing to a wall, a portable greenhouse is the better fit. For a freestanding walk-in tunnel with more floor space, see the large greenhouse options.

Order only after the wall measurements, the ground condition and the parts list all line up.

How do you keep a DIY kit in good shape?

Keep a kit in good shape by re-tensioning the cover, clearing snow and patching tears, plus checking the frame fixings each season. Small checks stop a light kit from failing in the first winter.

Check the cover after storms. Loose film flaps, and flapping wears the material at the frame edges.

Pull the cover taut and re-tie the guy ropes.

Clear heavy snow. A flat or shallow roof holds more weight than a steep one.

Brush snow off from the ground with a soft broom rather than climbing on the frame.

Wash the cover now and then. Dirt blocks light and cuts the growing benefit.

Rinse with water and a mild soap, then let it dry before you re-tension it.

Inspect the joints and fixings. Plastic joints can loosen over time, so push them back in and replace any cracked ones.

Check the wall fixings and the ground stakes each spring.

Keep a repair kit on hand. TapeManBlue's tape is made in the USA from clear polyethylene and is UV resistant.

A quick patch on a small hole saves the whole cover.

Check the cover, joints and anchors each season, and fix small damage before it spreads.

How we chose the kits in this guide

We compared the kits on footprint, frame and cover materials, included anchors and the growing features a home gardener needs. Our score weighs those specs against what a DIY buyer wants from a wall-mounted kit.

We started with size. A lean to kit only helps if it fits your wall, so we looked at both a compact 6.6 ft model and a taller 7 ft shelved kit.

Then we checked the frame type, since plastic and steel suit different levels of permanence.

We also looked at what comes in the box. Stakes and guy ropes matter more on a lean to kit than on a heavy freestanding greenhouse, because the open side catches wind.

A kit with shelves saves you buying staging.

Finally, we included a repair tape as an essential extra. Polyethylene covers tear, and a kit that stays up all year needs a patch supply.

The tape earns its place as a maintenance item rather than a greenhouse in its own right.

Our scores are set from the product data and the buyer's needs. They are not test results.

We research the kits and compare the specs, and the final choice rests on your wall and your growing plans.

Judge a kit on fit, frame, cover and anchors first; treat everything else as a bonus.

Which kit should you pick?

Pick the Ohuhu lean to kit if you have a narrow wall and want a light kit you can assemble and move yourself. Its 6.6 x 2.5 x 5.5 ft frame, roll-up zippered door and two mesh windows suit a patio edge or garden path.

Ohuhu says the PE cover resists tears and UV, and the kit includes stakes and windproof ropes. For most home gardeners choosing a lean to greenhouse kit, this is the one we would start with.

Choose the Outsunny if you want standing height and built-in shelves. Its 7 x 3 x 7 ft steel frame carries three tiers of wire shelving, and its two doors and screened window help with access and airflow.

It suits a permanent spot beside a house or garage wall, and it takes longer to build.

Add the TapeManBlue repair tape either way. A 6 in by 108 ft roll covers splits and holes in polyethylene film and keeps the kit going through winter.

If you're still deciding between kit types for a lean to greenhouse kits DIY project, weigh your wall length and wind exposure first. A flat, sturdy wall in decent light matters more than any single feature.

Then order the kit that fits that wall, anchors well and comes with the parts you need.

Pick the Ohuhu for a narrow, movable kit; pick the Outsunny for height and shelves; buy the repair tape with either.

Frequently asked questions

Do lean to greenhouse kits DIY need a foundation?

Most kits anchor to the ground with stakes, guy ropes or bolts rather than a poured foundation. Level the ground first and tie the frame to a wall or fence where the kit allows, since a flat base keeps the frame square during assembly.

Can I attach a lean to greenhouse to a wooden fence?

Many kits can sit against a wooden fence, but check that the fence is sturdy enough to carry wind load. The kit still needs its own ground anchors, and the cover should not press against rough timber that could wear it.

How long does a DIY lean to greenhouse kit take to build?

Plan on a few hours for two people on a small kit like the Ohuhu, and longer for a taller shelved model like the Outsunny. The work is mostly frame assembly and cover fitting, so read the instructions fully before you start.

What is the smallest lean to greenhouse kit I can buy?

Small kits run about 6.6 ft long by 2.5 ft deep, like the Ohuhu at 6.6 x 2.5 x 5.5 ft. That footprint suits a narrow path or patio edge, while a 7 x 3 ft model such as the Outsunny gives more room for shelving.

How do I repair a rip in a lean to greenhouse cover?

Patch small tears with clear polyethylene repair tape as soon as you spot them. TapeManBlue's roll is 6 inches wide and 108 feet long, wide enough to cover a split seam and long enough to keep a spare supply for future repairs.