Fireplace Insert Installation
An insert turns an open fireplace into a much more efficient heater. It also changes what the chimney has to do, so the flue is part of the job from the start.
What an insert does
An open fireplace sends most of its heat up the chimney. An insert is a closed unit, burning wood, gas or another fuel, that sits inside the firebox and delivers much more of the heat to the room. The exhaust leaves through a smaller pipe, and that is where the chimney work comes in.
Why the chimney is part of the job
- The old flue is usually far larger than the insert needs, and the exhaust cools too quickly in it
- Cooling gases deposit creosote and moisture in the flue and can damage it
- Most insert manufacturers require a continuous liner from the insert to the top of the chimney
- An unlined or damaged flue has to be fixed before an insert goes in
For the full picture see liner installation and our guide on stove and insert liners.
What installation involves
| Step | What happens |
|---|---|
| Inspection | We check the flue and the fireplace for suitability. See inspection before a new appliance. |
| Fit check | The insert has to fit the opening and the clearances in the manufacturer’s instructions. |
| Liner | A liner is installed from the insert to the top of the chimney. |
| Insert | The insert is set in the firebox and connected to the liner. |
| Finish | The top is capped and sealed, and we check the result. |
Codes and permits
Inserts are governed by the manufacturer’s instructions and local codes, and many towns require a permit. We tell you what applies before work starts.
The firebox of an old fireplace can have cracks or a damaged damper. We look at these as part of the assessment, and tell you what to fix first.
What the work involves
How installation goes
- InspectWe check the chimney and the fireplace.
- PlanWe confirm what the insert needs.
- InstallThe liner and insert are installed.
- FinishWe cap the chimney and check the system.
Questions
Frequently asked questions
Does an insert need a liner?
Usually, yes. The manufacturer’s instructions decide, and most require one.
Can any insert go in any fireplace?
No. It has to fit the opening and the clearances. We check before you buy.
Is a gas insert different?
Gas inserts have their own venting requirements. See gas log installation for a related option, and tell us which fuel you plan to use.
Do I need a permit?
Often. Requirements vary by town.
Ready to have your chimney looked at?
Call us, or send a scheduling request. We will contact you to confirm a time. Your appointment is not confirmed until we do.