What Is Home Remodeling?

What home remodeling means

Home remodeling is changing a house so it works differently. Taking down a wall to open a kitchen, turning a closet into a bathroom, finishing a basement, adding a primary suite: each changes the layout, the systems or the use of the home.

Building codes use more exact words. The 2021 International Residential Code (IRC) defines an alteration as any construction, retrofit or renovation to an existing structure, other than repair or addition, that requires a permit; it also covers changes to building, electrical, gas, mechanical or plumbing systems that extend, add to or rearrange them ¹.

An addition increases floor area, number of stories or height ¹. A repair is the reconstruction or renewal of part of a building for maintenance or to correct damage ¹.

So in code terms, most remodeling is alteration work, and some of it is an addition. Pure repair, like replacing a rotted stair tread with a new one, is not remodeling.

Remodeling is a large part of housing. Harvard’s Joint Center for Housing Studies reports a U.S. remodeling market of more than 600 billion dollars a year, serving a housing stock of about 145 million homes ⁴.

How a home remodel comes together

Every remodel, from a bathroom to a whole-house project, moves through the same broad stages.

1. Plan: Decide what should change and why, and set a budget range.
2. Design: Turn ideas into drawings and a written scope of work. A designer, architect or design-build firm may do this.
3. Bid and contract: Get prices on the same scope and sign a contract that defines work, price, schedule and changes.
4. Permit: The contractor or owner applies for permits; most structural, plumbing, electrical and gas work needs one ².
5. Build and inspect: Work proceeds in stages, with inspections before walls are closed ².
6. Close out: Final inspection, punch list, final payment and warranty documents.

Types of home remodeling projects

Example: how the codes classify five common projects

The 2021 IRC and 2021 International Existing Building Code (IEBC) would label typical jobs in a 2,000 sq ft house. It illustrates the model codes; your jurisdiction’s adopted code decides ¹³.

The class matters because it decides how much of the existing house must be brought up to current rules. The IRC itself says additions, alterations and repairs must conform to the code for new work without requiring the existing structure to comply, and must not make the house less compliant than before ².

Where remodeling terms show up: contracts, permits and lenders

In contracts: State home improvement laws govern remodeling contracts. California, for example, requires a written contract for home improvement projects over 500 dollars in combined labor and materials ⁶. Our guide to remodeling contracts covers payments, changes and liens.

On permits: The permit application describes the work and its use, and the building department decides whether it is a repair, alteration or addition ². Our permits and approvals guide explains the process.

In budgets: Remodels are priced by scope, not by a single average. Our remodeling cost guide explains what moves a budget.

Remodeling vs moving: what each offers

Limits: what a remodel cannot easily change

Some things are hard to remodel away. Lot size, setbacks and zoning limit how far an addition can grow. Ceiling heights, stair locations and the main structural lines of a house can be changed, but at a high cost.

Older homes add limits too. Opening walls also opens the building envelope, which then has to be sealed and insulated again.

A remodel may uncover outdated wiring, undersized framing, or materials that need special handling, such as lead paint or asbestos.

Work in the remodeled area has to meet today’s code, and the change cannot make the house less compliant than it was ².

Finally, a remodel does not guarantee resale value. National reports on cost recouped are estimates, and they vary by project and market. Our remodel vs move calculator helps you weigh the choice.

What drives the cost of a remodel, and how long it lasts

We do not publish average remodel prices; a national figure would mislead for most homes. The drivers are consistent: the scope, the finish level, how much moves (walls, plumbing, wiring, gas), structural work, the age of the house and any hazards found, site access, local labor, permits and design fees.

The life of remodeled work depends on its parts. Framing and foundations are meant to last the life of the house. Finishes, fixtures and appliances wear out on their own schedules and carry the maker’s warranty. The contractor’s workmanship warranty covers installation for the period the contract states.

Who does what in a remodel

1. The owner sets goals, budget and decisions, and signs the contract.
2. A designer, architect or design-build firm draws plans and writes the scope; see our design-build vs architect comparison.
3. A licensed general contractor runs the job and the subcontractors, where the state requires a license.
4. Licensed trades handle plumbing, electrical, gas and HVAC.
5. An engineer designs structural changes, such as opening load-bearing walls, moving beams or altering foundations.
6. The building department reviews plans and inspects the work ².

After the remodel: keeping it in shape

• Keep the paperwork: permits, final inspection, drawings, warranties and product manuals.
• Register product warranties where the maker requires it.
• Follow care instructions for new finishes, such as grout sealing or flooring care.
• Walk the work at the end of the first year and report defects within the warranty period.
• Run new ventilation in kitchens and baths to protect finishes from moisture.

Common remodeling risks and warning signs

• Vague scope or allowances that leave the real price open.
• Large deposits demanded up front, or cash only.
• No permit for work that moves walls, plumbing or wiring.
• Hidden conditions such as rot, old wiring or water damage behind walls.
• Hazardous materials disturbed without proper practices.

Our guide to choosing a remodeling contractor covers how to check licenses, insurance and references.

Codes and laws that govern remodeling

Building codes. The 2021 IRC requires permits to construct, alter, repair, move or demolish a house and to change its building systems, with listed exemptions such as painting, tiling, cabinets and countertops ².

Section R102.7.1 says additions, alterations and repairs must meet the code for new work without forcing the whole existing house to comply, and must not make it less compliant ².

Existing buildings. Many jurisdictions also use the 2021 International Existing Building Code. It classifies work as repair; Level 1 alteration (replacing or covering materials that serve the same purpose).

Level 2 (adding or removing doors or windows, reconfiguring space or systems, in up to half the building); Level 3 (work area over half); change of occupancy; or addition ³.

Federal rules. EPA’s Renovation, Repair and Painting Rule requires certified firms for paid work that disturbs paint in pre-1978 homes, with some states running their own programs ⁵.

State contract law. States set home improvement contract rules, licensing and deposit limits; California’s CSLB is one example ⁶. All codes listed are model codes; check what your state and city adopted.

Home renovation vs remodeling: is there a difference?

In everyday use, the two words overlap. A common distinction is that renovation restores or refreshes what is there, such as new finishes, paint or fixtures in the same places, while remodeling changes the form or function, such as moving walls or turning one room into another.

Building codes do not use that distinction. The IRC folds renovation into its definition of alteration: any construction, retrofit or renovation to an existing structure, other than repair or addition, that requires a permit ¹. What matters for permits is what the work does, not what you call it.

A useful test: if the room will work the same way afterward, with things in the same places, most people would call it a renovation or refresh. If the layout, structure or use changes, it is a remodel. Either can need a permit.

Remodeling vs renovation, repair and addition

Home remodeling myths

Myth Remodeling means the whole house must meet today’s code.

Reality The IRC applies new-work rules to the altered parts without requiring the existing house to comply ².

Myth Interior remodels never need permits.

Reality Changes to walls, plumbing, wiring or gas usually do ².

Myth Renovation is exempt; remodeling is not.

Reality Codes judge the work, not the word; the IRC alteration definition includes renovation ¹.

Myth Homeowners can ignore lead rules.

Reality Owners doing their own work are generally outside the RRP rule, but paid contractors are not, and the dust hazard is the same ⁵.

What changes by state and city

When remodeling is the right call, and what to do next

Remodeling makes sense when you like where you live but the house does not work for you, and the change fits your lot, budget and timeline. It is a harder case when the change you need fights the structure or zoning, or when the project would cost close to moving.

Start with what should change, then write it down room by room. Our remodel planning page walks through the first steps, including how long design, permits and construction may take.

Related terms

Remodeling Scope of Work

A remodeling scope of work is the written description, inside or attached to a contract, of exactly what work a contractor will do, which materials and equipment will be used, and what is excluded from the job.

Remodeling Allowance

A remodeling allowance is a set amount of money written into a contract price for an item that has not been chosen yet, such as tile, light fixtures or appliances, which is adjusted up or down once the real item is picked.

Building Permit

A building permit is an official document from the local building department that authorizes specific construction work, such as building, altering, repairing or demolishing a structure, and requires that work to be inspected against the adopted building code.

Existing Building Code

An existing building code is a model code, most often the International Existing Building Code (IEBC), that sets the rules for repairing, altering, adding to, changing the use of and moving buildings that already exist, so that work on them does not have to meet every new-construction rule.

Also referenced from: Remodeling Scope of Work, Remodeling Allowance, Certificate of Occupancy, Handrail Code Requirements, Remodeling Cost Per Square Foot, Construction Defect, Substantial Completion, Remodeling Contractor Warranty