what is a detached dwelling 

A prefab ADU can feel like a shortcut, but the site still decides timeline and cost. The unit is only part of the project. You still need foundation, utility hookups, drainage, access for delivery or crane placement, and permit approval—this is where surprises usually live. Permitting goes smoother when plans match site reality—utility locations, access, and code details—before anything is ordered. When comparing prefab vs custom, use total installed cost and timeline (including permits and site work), not the base unit price. For the right questions to ask before buying, start here: best prefab adus. If you’re collecting bids, ask for a written scope with exclusions listed—this prevents misunderstandings later. Good plans reduce rework; rework is where budgets quietly leak. A realistic schedule includes ordering lead times and inspection windows, not just a hopeful start date. If you’re collecting bids, ask for a written scope with exclusions listed—this prevents misunderstandings later. Keep a short list of non-negotiables so decisions stay consistent as options multiply. If you’re collecting bids, ask for a written scope with exclusions listed—this prevents misunderstandings later. Keep a short list of non-negotiables so decisions stay consistent as options multiply.