The greenhouses are meant to be put on the level ground. A greenhouse of 8x8 takes about an afternoon. A gazebo takes about an afternoon. A garden building is built for you in about a day. Normally you can build a 120 sq.
Some areas are more restrictive.
Always check with your local authorities to be sure. Prices are based on standard building templates. We do custom work if none of the standard buildings and options will work for you. Make the site as clean and level as possible. For garden buildings we can adjust the number of blocks or use post and beam construction under the building.