Building a Greenhouse Using Old Windows Next Step

The next steps included building the walls using pressure treated 2x4s. I sized the openings so the old windows would fit tightly between the studs to retain heat in the winter. I bought and installed a 36 inch storm door to provide easy access to the greenhouse. The door wasn't pre-hung so it was more difficult to install than I expected. The first picture shows the original tiny greenhouse (to the left) this one will replace. Finally in the second picture we installed floor of pavers to provide a level base and absorb and retain more heat.