Hello Emmalee Aiken

Thank you for contacting the UNH Extension Infoline regarding your pool project .

Following up on your email , I’ve attached some general information to help get you started.

We are committed to finding the right solution for your lawn and are happy to provide further guidance as needed.

Please feel free to reach out with any further questions.

Best regards,

Haim
Master Gardener Volunteer
UNH Extension Infoline Team

General information

Turning inground pool to green house .

That is such a creative and practical idea! Using an existing pool structure for a greenhouse is actually a known concept because the earth provides natural insulation, helping maintain stable temperatures year-round.

Since your pool is already south-facing, you have the perfect setup for a passive solar greenhouse. You wouldn't be 'filling the hole' so much as 'capping' it with a transparent roof and potentially adding some internal drainage or raised beds.

here are a few things you might want to consider:

• Structure: Instead of full repairs, you’d focus on adding a sloped, transparent roof (like polycarbonate panels) over the pool.
• Drainage: This is the most critical technical piece; you'll need to ensure water from rain or plant runoff has a place to go so it doesn't just sit in the bottom.
• Thermal Mass: The concrete walls of your pool already act as 'thermal mass,' absorbing heat during the day and releasing it at night.

I've attached some links to companies that specialize in these kinds of enclosures and some DIY guides from people who have done exactly what you're thinking of!"

Where to Find More Information

Specialized Companies

While many local greenhouse builders can do custom work, these companies specifically market pool-to-greenhouse conversions or heavy-duty enclosures:

Aqua Shield: They offer specific solutions for converting inground pools into year-round greenhouses or multi-use enclosures.

Gothic Arch Greenhouses: Specializes in custom-designed pool and spa enclosures that handle snow and wind loads.

Botanical Greenhouse Builders: Focuses on high-end glass and polycarbonate enclosures for spas and pools.

Key Technical Considerations

1. Drainage: You may need to drill holes in the bottom of the pool or install a sump pump if the existing plumbing isn't usable.
2. Permitting: Check with your local town hall; converting a pool to a greenhouse may change your property's tax assessment or require a change-of-use permit.
3. Insulation: In colder climates, lining the north wall with insulation or earth berms can significantly increase winter warmth.

Some additional information that can help you about the subject

https://northerngardener.org/walipini/

https://www.motherearthnews.com/organic-gardening/essential-tips-for-building-a-durable-walipini-greenhouse-zbcz1706/

https://ceresgs.com/the-walipini-low-down/

https://charleysgreenhouses.com/news/walipini-underground-greenhouses/