Chimney & fireplace
Fireplace Insert Cost Calculator
Prices an insert, where the liner is not optional and converts an inefficient fireplace into a heater.
Result
A planning estimate, not a quote. Access, the age of the equipment, what is found once it is opened up and local labour rates all move the real figure, sometimes a long way.
Get a Free Business AuditHow the calculation works
Hours times crew times rate, plus the appliance, liner and the call-out. An insert is a closed appliance fitted into an existing masonry fireplace, with a liner run from it up the flue to the top. That liner is the whole technical point: the existing masonry flue was sized for an open fireplace and is far too large and too cool for a closed appliance, so without a correctly sized liner the gases condense, creosote accumulates rapidly and the draught is poor.
What moves the number
- Flue height and liner diameter, which drive the liner cost.
- Whether the existing firebox and flue need repair before fitting.
- Whether the appliance is wood, gas or pellet, which changes the venting.
- Surround and trim to close the gap between appliance and opening.
Where this one goes wrong
An insert fitted without a full-height correctly sized liner is a defective installation, not a cheaper one, and it is common enough that inspectors look for it. The appliance exhausts into a flue many times its required area, the gases cool, creosote forms quickly and the draught is unreliable, which is both a chimney fire risk and a performance complaint. On value, an insert genuinely transforms an open fireplace, which loses most of its heat up the flue and can draw more heated air out of the house than it contributes, into an appliance that actually heats, and that is the honest case for the cost.
Before you quote
- Run a full-height liner sized to the appliance, without exception.
- Inspect and repair the existing firebox and flue before fitting.
- Confirm the surround closes the opening to the listed detail.
Where the rules come from
Questions
About this calculator
Does an insert need a liner?
Yes, a full-height liner sized to the appliance, and fitting one without is a defective installation. The existing masonry flue was sized for an open fireplace and is far too large and too cool for a closed appliance, which means condensing gases, rapid creosote buildup and unreliable draught.
Is an insert worth it over an open fireplace?
For heating, substantially. An open fireplace loses most of its heat up the flue and can draw more warmed household air out than it contributes, while an insert is a closed appliance that actually delivers heat into the room. That is the honest case for the cost rather than appearance.
Can an insert go into any fireplace?
It needs an opening of suitable dimensions and a flue that can take the liner, and the existing firebox and flue should be inspected and repaired first. Some masonry fireplaces are too small or have flue geometry that makes lining difficult, which is established by inspection rather than measurement alone.
The formula
total = hours x people x rate + parts + call-out, then sales tax
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How to use this calculator
- Hours on site (h). Enter your own figure; the page starts at 2 h.
- People needed. Enter your own figure; the page starts at 1.
- Labour rate charged ($). Enter your own figure; the page starts at $125.
- Parts and materials ($). Enter your own figure; the page starts at $65.
- Call-out or diagnostic fee ($). Enter your own figure; the page starts at $95.
- Sales tax (%). Leave at zero if you are quoting before tax.
The result updates as you type, so you can try a figure, see what it does to estimated total, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Hours on site | 2 h |
| People needed | 1 |
| Labour rate charged | $125 |
| Parts and materials | $65 |
| Call-out or diagnostic fee | $95 |
| Sales tax | 0% |
What comes out
| Result | Value |
|---|---|
| Estimated total main result | $410 |
| Labour | $250 |
| Before tax | $410 |
| Sales tax | $0 |
About $410: $250 of labour, $65 of parts and a $95 call-out.
How sensitive the answer is
Holding everything else steady and changing only labour rate charged, this is what happens to estimated total. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Labour rate charged ($) | Estimated total |
|---|---|
| $63 | $286 |
| $94 | $348 |
| $125 example above | $410 |
| $188 | $536 |
| $250 | $660 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Hours on site (h)
- Measured in h, between 0 and 400, starting at 2 h.
- People needed
- A number, between 0 and 40, starting at 1.
- Labour rate charged ($)
- A money amount, starting at $125.
- Parts and materials ($)
- A money amount, starting at $65.
- Call-out or diagnostic fee ($)
- A money amount, starting at $95.
- Sales tax (%)
- Leave at zero if you are quoting before tax.
What the results tell you
| Result | What it is |
|---|---|
| Estimated total | The headline result. A money figure. |
| Labour | A money figure. |
| Before tax | A money figure. |
| Sales tax | A money figure. |
Estimating is the easy part
The jobs you never hear about cost more than the ones you mis-measure. BDEVY builds the marketing, systems and automation that bring them in.