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Prefab 'In-law' Cottages Mix High-tech Features, Comfort

New freestanding modular home additions aim to provide the right kind of space for aging in place.

O’Connor believes that ADUs can be a viable alternative, “but not without consideration. Make the choice with thoughtful purpose, and don’t plan to just park somebody there. Plan how to help her stay engaged in the wider community.

“And don’t forget that at-home health care always takes a toll on the caregiver. Again, plan ahead for support and relief from care duties,” O’Connor says.

ADU Costs vs. Conventional Additions

Are ADUs less expensive than comparable home additions built in the conventional way? If you’re able to put an ADU on your property, the answer is probably yes.

Since prefab additions are relatively new, cost data for direct comparison with conventional home additions aren’t available. Instead, we have to work with comparisons between new prefab and homes  built on site. The consensus among cost estimators is that prefab costs less than stick. How much less? CostHelper.com  — an online building cost reference tool — says that “modular construction costs 5 to 25 percent less than traditional homes built on site.”

Construction costs vary widely by region and local market conditions. Remodeling is generally more expensive on a square-foot basis than new

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