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How much does a garage conversion cost?

A professional garage conversion costs $5,000 to $50,000 or more, per HomeGuide, while simply finishing a garage costs $10 to $30 per square foot.

Two different jobs wear the same words and the price gap is the point. On HomeGuide's table, a partial renovation at $1 to $10 per square foot, or $500 to $5,000, is cosmetic — paint, resurfaced flooring, a new door. A full remodel at $10 to $30 per square foot, or $3,000 to $17,000, gives a finished garage with new floors, finished walls, storage and an upgraded door, and the space still parks a car. A conversion to living space at $50 to $200 per square foot, or $5,000 to $50,000 and up, means new floors, walls, windows, insulation, drywall, electrical, plumbing and heating and cooling, and the space stops being a garage.

Source: HomeGuide

This page is general information, not professional advice. Remodeling prices move with your local labor market, the condition of what is already there, the finishes you pick and what your building department requires, and the only number that counts is a written quote from a contractor who has walked the job.

Garage conversion cost by size

Garage sizeFull remodel and finishingConvert to living space
1-car$2,900 – $11,800$5,000 – $20,000+
2-car$4,000 – $17,300$10,000 – $50,000+
3-car$5,800 – $25,900$30,000 – $75,000+
4-car$8,600 – $47,500$50,000 – $100,000+
RV or camper van$5,000 – $15,000$15,000 – $35,000+
HomeGuide's published garage remodel and conversion cost by garage size.

Source: HomeGuide

What the room becomes moves the number as much as the size does. HomeGuide publishes $3,000 to $6,000 for a utility room or mudroom, $2,000 to $9,000 for a home gym, $5,000 to $10,000 for an office or a living room, $5,000 to $17,000 for a bedroom, $6,000 to $54,000 for a kitchen and $20,000 to $100,000 or more for a full apartment, in-law suite or studio. The office, living room and gym share one requirement list — a window, wiring, insulation, drywall, heating and cooling and new flooring — and everything above them adds plumbing.

Source: HomeGuide

Plumbing is the line that separates HomeGuide's $5,000 room from its $50,000 one. HomeGuide prices new plumbing pipes at $450 to $1,800 per fixture, and a garage has none.

The lines a conversion quote should show separately

LineAverage cost
Wall framing$1,000 – $5,000
Drywall$800 – $5,000
Insulation$1 – $3+ per square foot
Flooring installation$2 – $23 per square foot
Windows (each)$150 – $1,000
Outlets (each)$150 – $800
Dedicated circuit (each)$250 – $900
Ducts and vents (per run)$400 – $600
Raise or level the garage floor$300 – $5,400
Permit fees$1,000 – $2,000
HomeGuide's published cost factors for a garage remodel or conversion, itemised.

Source: HomeGuide

HomeGuide says most garage conversions need at least one new 20-amp circuit and that a bathroom, kitchen or heavy appliance may need dedicated circuits of its own, with an electrician at $40 to $100 per hour and a subpanel at $500 to $1,700. It also says most garage conversion contractors charge a flat 10% to 20% of the total project cost to coordinate the work, that a detached garage costs more to convert than an attached one because the plumbing and electrical have further to travel and the footings may need bringing up to code, and that hiring an architect costs $100 to $250 per hour or 5% to 20% of the construction cost — with some cities requiring a licensed architect or engineer to sign the plan before it will be approved.

Source: HomeGuide

What to know before you start

Three things HomeGuide states plainly. A garage conversion may decrease home value in regions where garage parking is highly valued. Homeowners insurance may need adjusting if the conversion adds to the home's livable square footage. And a garage conversion to an accessory dwelling unit takes 2 to 12 months. Its comparison figures are worth having beside a quote: a garage extension is $60 to $120 per square foot, enclosing a carport into a room is $7,000 to $20,000 or more, and converting a carport to a garage averages $25,000 with a typical range of $10,000 to $40,000.

Source: HomeGuide

The two-car version of this job, with three phrasings nobody had answered: what a double garage conversion costs.

Ask each bidder to itemise the framing, the electrical and the plumbing separately, and to say whether the floor needs levelling. These are the general contractors AI assistants actually name when homeowners ask. Nobody can pay to be on these lists.

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Questions people ask next

How much does it cost to convert a garage to a bedroom?
HomeGuide publishes $5,000 to $17,000, with the low end being a small bedroom with a window, insulation, drywall, flooring, outlets, heating and cooling and a closet, and the high end a larger bed-and-bath suite where the plumbing adds the cost.
Is converting a garage cheaper than building an addition?
On HomeGuide's own tables, yes: it prices a garage conversion at $50 to $200 per square foot against $125 to $250 for a room addition, because the conversion reuses a foundation, walls and a roof that already exist.
Do I need a permit to convert a garage?
HomeGuide lists permit fees at $1,000 to $2,000 for a garage remodel and says some cities require a licensed architect or engineer to sign the proposed plan before approving it. Non-certified site plans cost $100 to $250 on HomeGuide's figures but are not accepted everywhere.
What is the cheapest garage conversion?
A room with no plumbing. HomeGuide publishes $2,000 to $9,000 for a home gym and $5,000 to $10,000 for an office or living room, against $6,000 to $54,000 for a kitchen and $20,000 to $100,000 or more for a full apartment or in-law suite.

Written for homeowners by Most Recommended Contractors, which measures which general contractors AI assistants actually recommend in 26 U.S. metros. Nobody can pay to be on those lists. How we measure.