Enter the total room or house square footage (ft^2) and the cost per square foot to rewire ($/ft^2) into the Calculator. The calculator will evaluate the Rewire Cost.
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How to Estimate Rewire Cost
The rewire cost calculator gives a fast budget estimate for replacing electrical wiring in a room, addition, or entire house. It uses a simple area-based model: multiply the total square footage by the assumed rewiring cost per square foot. This makes it useful for early planning, comparing quote ranges, and testing how different project conditions affect the total.
RC = A \times CPA
Variables used by the calculator:
| Variable | Meaning | Typical Unit |
|---|---|---|
| RC | Total estimated rewire cost | Dollars ($) |
| A | Total room or house area | Square feet (ft²) |
| CPA | Cost per square foot to rewire | Dollars per square foot ($/ft²) |
If you know any two of the three values, the calculator can solve for the missing one.
CPA = \frac{RC}{A}A = \frac{RC}{CPA}How to Use the Calculator
- Enter the total area being rewired in ft².
- Enter the expected rewiring cost per ft², or use a size-based scenario estimate.
- Calculate the result to get the projected rewiring cost.
- Adjust the cost-per-square-foot value if your project has difficult access, older wiring, or added electrical upgrades.
Choosing a Cost Per Square Foot
The most important input is the cost per square foot. A quick planning range is often $2 to $5 per ft². Lower values usually fit straightforward rewiring in accessible areas, while higher values are more realistic when access is difficult or when older systems need more labor.
- Standard modern home: better access, more predictable routing, fewer surprises behind walls.
- Older home or limited access: plaster walls, tighter framing cavities, or more difficult cable runs.
- Knob-and-tube or major upgrade: more demolition, more circuit changes, and more repair work after the electrical portion is complete.
Because this is a linear estimate, the total increases proportionally with area. If the rate stays the same, doubling the square footage doubles the estimated cost.
Quick Cost Reference Table
| Area | At $2/ft² | At $4/ft² | At $5/ft² |
|---|---|---|---|
| 800 ft² | $1,600 | $3,200 | $4,000 |
| 1,200 ft² | $2,400 | $4,800 | $6,000 |
| 1,600 ft² | $3,200 | $6,400 | $8,000 |
| 2,000 ft² | $4,000 | $8,000 | $10,000 |
| 2,400 ft² | $4,800 | $9,600 | $12,000 |
| 3,000 ft² | $6,000 | $12,000 | $15,000 |
Example
If a house has 2,400 ft² of area and the rewiring cost is estimated at $4 per ft², the projected cost is:
RC = 2400 \times 4 = 9600
So the estimated rewire cost is $9,600.
What Can Change the Final Price?
Square footage is a strong starting point, but real-world electrical projects are also shaped by scope and access. Two homes with the same size can price very differently if one is easy to route and the other requires wall opening, patching, or system upgrades.
- Age of the home: older homes often involve outdated wiring methods, limited grounding, and more troubleshooting.
- Wall and ceiling access: open framing is faster than finished plaster, tile, or dense insulation.
- Number of devices: more outlets, switches, dedicated circuits, and lighting points can push the project above a simple area estimate.
- Panel and service work: a full rewire may lead to panel changes, breaker replacement, or capacity upgrades.
- Permit and inspection requirements: these may be priced separately from the wiring labor itself.
- Repair and finishing work: drywall patching, painting, and trim restoration are often outside the base wiring number.
When This Calculator Is Most Useful
- Creating an early renovation budget
- Comparing low, mid, and high cost scenarios
- Checking whether a contractor quote is in a reasonable range
- Estimating rewiring costs for a partial remodel versus a full-home project
What the Estimate May Not Include
For best results, confirm whether your planned budget includes only rewiring labor and materials or also includes add-on costs such as panel replacement, permit fees, drywall repair, fixture replacement, appliance circuits, surge protection, AFCI/GFCI protection, or service entrance work. Those items can materially change the final total even when the square footage stays the same.
Practical Estimating Tips
- Use the custom input option when you already have a contractor’s $/ft² figure.
- Use the size-based estimate when you want a fast planning number before requesting bids.
- Compare multiple scenarios instead of relying on one single rate.
- Match the estimate to the actual scope: partial rewire, whole-house rewire, or rewire plus system upgrade.
- Round your final budget upward if the house has difficult access or older electrical infrastructure.
Common Questions
Is square footage enough to price a rewire?
Square footage is excellent for a preliminary estimate, but it does not capture every labor condition. It should be treated as a budgeting tool, not a final quote.
Can I use this calculator for one room?
Yes. Enter the square footage of the room and the expected cost per ft² for that smaller scope.
Why do older homes usually cost more?
Older homes often require more careful routing, more opening and repair work, and more corrections to bring the system up to current expectations.
Should I estimate low or high?
For early planning, it is smart to run at least two numbers: a conservative low estimate and a higher estimate that accounts for access issues and upgrade work.
