Estimating interior rehab costs requires a detailed approach, as the scope of work can vary significantly. Start by breaking down the project into its core components: demolition, drywall, kitchens, bathrooms, doors, trim, painting, and flooring. Each of these elements has unique cost factors.

Demolition involves removing existing materials, and costs are typically calculated based on the time required and disposal fees. Drywall installation is often estimated by the square foot, with factors like ceiling height and complexity affecting the price. Kitchen and bathroom remodels are more complex, involving cabinetry, countertops, fixtures, and appliances, each with its own cost considerations. Doors and trim are usually priced per unit, with style and material impacting the cost. Painting estimates consider the square footage of walls and ceilings, as well as the type of paint used. Flooring costs are calculated based on the square footage of the area and the chosen material, such as carpet, tile, or hardwood.