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One-Bedroom vs Three-Bedroom ADU Cost

How to compare 1L and 3L ADU cost paths without confusing model size and site costs.

Search signal

The seed set included one-bedroom and three-bedroom ADU cost intent. That comparison should not be reduced to square footage alone, because fixed site costs can affect small and large units differently.

1L path

The 1L path can be useful for compact rentals, parent suites, guest units, or smaller lots, but it still needs utility, foundation, permit, delivery, and setting allowances.

3L path

The 3L package includes verified facts such as 962.40 sf gross area and 931.63 sf net indoor area in the source packet. Use those facts for model comparison, then keep site costs separate.

Calculator use

Model size changes the budget, but not every cost scales with size.

1L thinking

The one-bedroom path may reduce product and finish scope, but local fixed costs can remain meaningful.

3L facts

The 3L package source shows 962.40 sf gross area and 931.63 sf net indoor area for model comparison.

Fixed costs

Permits, utility routing, setting access, and some foundation work may not shrink in a straight line.

Decision rule

Choose model path first, then compare complete installed budgets instead of unit-only prices.

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