A prefab ADU can feel like a shortcut, but the site still decides timeline and cost. Before choosing a model, confirm what’s included: interior finishes, appliances, panel requirements, and exterior tie-ins like stairs or skirting. Clarity here prevents budget creep. Sound control is easiest to build in early: insulation choices, resilient channels, solid-core doors, and smart room placement. Ask for a site-responsibility checklist and price those line items: trenching distance, panel upgrades, water/sewer connection, and final grading. For the right questions to ask before buying, start here: <a href=https://www.flakydough.com/2025/08/01/home-improvement-and-remodeling-services-159/>adu prefab kits</a>. When in doubt, simplify—fewer custom details often means faster progress and cleaner results. A realistic schedule includes ordering lead times and inspection windows, not just a hopeful start date. Good plans reduce rework; rework is where budgets quietly leak. Keep a short list of non-negotiables so decisions stay consistent as options multiply. Keep a short list of non-negotiables so decisions stay consistent as options multiply. A realistic schedule includes ordering lead times and inspection windows, not just a hopeful start date. 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.