How strictly must developers adhere to the site plan?

Before purchasing the house, we received a site plan on which certain items were marked as "demolition." How must the developer adhere to this?

As contractually agreed. Without more information, no assessment is possible.

Before buying the house, we received a site plan showing certain items marked as "demolition".

Are you referring to a brochure of the planned land development?

How must the developer adhere to this?

The developer must only adhere to what is stated in the purchase contract with you. Towards the building authority, he must demolish what he has been authorized to demolish (and ensure the structural stability of what he has applied to retain). Example: Furniture store is demolished, investor builds a dozen semi-detached houses on the entire campus, hall is demolished, one hall wall remains standing as a screen towards the neighboring mixed-use area. Daily routine, completely fine if application and execution are congruent. Sketches are common in building applications, but not excluded in demolition applications either.

Yes, the site plan that has been submitted, which states what will be demolished and what will remain.

Then show the plan and the differences in it. So we also know what it is about. You have a knowledge advantage. We cannot look into your head.

The yellow above is the wall The street is therefore narrower, which also belongs to the property, so the marked flowerbed and the trash bin space do not exist. Now it is more like this