What is a gut renovation?

A gut renovation, also called a gut rehab, strips interior finishes back to the framing so the interior can be rebuilt and systems replaced. In New York City, changing escape routes triggers a new Certificate of Occupancy under AC 28-118.3.3; include those layout changes in the scope review.

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By InstaBids editorial team with AI research agents. Updated 4 November 2026

What this means for your home project

Review the proposed escape routes with your designer; in New York City, identify whether changes trigger a new Certificate of Occupancy under AC 28-118.3.3. Source: New York City Department of Buildings, read 2026-11-04.
For wall energy upgrades, list bathroom ventilation and window or door flashing as moisture items for assessment, so the repair scope identifies what needs attention. Source: U.S. Department of Energy, read 2026-11-04.
If the house predates 1978, ask for lead-paint testing of each distinct part affected by the energy-upgrade work before deciding the work practices. Source: U.S. Department of Energy, read 2026-11-04.
Request a written outdoor-air plan for the wall-upgrade scope, stating the approach for the home’s climate if the upgrade warrants added ventilation. Source: U.S. Department of Energy, read 2026-11-04.

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What is the difference between a gut renovation and a remodel?

For a whole-building scope, use the New York City distinction between comprehensive replacement and work limited to portions of the interior. “Substantial renovation of existing building space, but less than a gut renovation as described above.” Source: New York City Department of Buildings, read 2026-11-04. “Renovation and/or remodel of the interior of an entire existing building, consisting of complete removal, replacement or reconfiguration of: interior partitions and walls, the removal and replacement of ceiling systems and/or floor finishes, the replacement of interior doors and frames, the replacement of building plumbing, sprinkler, mechanical and electrical systems, modifications to the existing structure and exterior wall systems (which may involve window and exterior door replacement), building facade work and new exterior wall insulation, the replacement of existing roof systems, the replacement of interior cabinetry (millwork), the painting of rooms and common areas, etc.” Source: New York City Department of Buildings, read 2026-11-04.

Do I need a permit to gut a house?

In New York City, ask your designer to identify the permit applications for your gut-renovation scope and distinguish them from the exemptions in Administrative Code §28-105.4.5. “Most construction in New York City requires approval and permits from the Department of Buildings.” Source: New York City Department of Buildings, read 2026-11-04. “The NYC Administrative Code §28-105.4.5 clarifies exempt permit work.” Source: New York City Department of Buildings, read 2026-11-04. “These projects still require compliance with other laws or rules enforced by the Department.” Source: New York City Department of Buildings, read 2026-11-04.

What is included in a gut renovation, and what affects the price?

For the wall-upgrade portion of a gut renovation, budget decisions include insulation performance, while uncovered damage belongs in the repair scope. “The selection of cavity insulation for installation from the interior depends on desired performance and project budget.” Source: U.S. Department of Energy, read 2026-11-04. “As a matter of good practice, repair any damage uncovered during the retrofit process.” Source: U.S. Department of Energy, read 2026-11-04.

What questions should I be asking a general contractor before doing a full gut renovation on a house?

For the wall-upgrade part of a gut renovation, ask the contractor to document whether added outdoor air is needed and how ASHRAE Standard 62.2 will be considered. “ASHRAE Standard 62.2 is a controlled ventilation standard for new and existing homes.” Source: U.S. Department of Energy, read 2026-11-04. “Develop a climate-appropriate strategy for bringing in outdoor air should the upgrade warrant it.” Source: U.S. Department of Energy, read 2026-11-04.

What RRP requirements apply to a comprehensive renovation project involving the removal and replacement of all interior painted surfaces from target housing or a child-occupied facility?

For interior demolition in a home covered by the EPA lead-paint rule, include the post-work cleanup result in your written scope. “A project that involves the removal and replacement of all interior painted surfaces but leaves all exterior painted surfaces intact is considered a renovation for RRP purposes.” Source: U.S. Environmental Protection Agency, read 2026-11-04. “Following the renovation, the work area must also be cleaned until no dust, debris or residue remains.” Source: U.S. Environmental Protection Agency, read 2026-11-04.

Sources

Measure Guideline: Wall Air Sealing and Insulation Methods in Existing Homes; An Overview of Opportunity and Process — U.S. Department of Energy; published 2012; read 2026-11-04.
Project Categories: Renovations — Residential & Community Facilities — New York City Department of Buildings; read 2026-11-04.
Frequent Questions About Renovations Covered by the RRP Rule — U.S. Environmental Protection Agency; read 2026-11-04.
Does my project require a permit? — New York City Department of Buildings; read 2026-11-04.