How to measure your chimney breast for a fireplace

Wondering how to measure a chimney breast for a fireplace? Take five key sizes: the opening width and height, the chimney breast width, the hearth depth and the ceiling height. Note any recess too. Our full how to measure guide walks you through it, and we still measure on site before we make.

What measurements do I actually need?

Five, mostly. The opening width and height, the width of the chimney breast, the hearth depth, and the ceiling height. Add any recess or alcove detail and you have the picture we need to start.

Here is what each one is:

• Opening width and height: the size of the hole your fire sits in. This decides what fire and chamber will fit.
• Chimney breast width: how wide the wall the fireplace sits against is, so the surround is in proportion.
• Hearth depth: how far the hearth comes out into the room, which matters for both looks and any fire regulations.
• Ceiling height: so the surround suits the height of the room and does not sit too tall or too low.
• Any recess: a set-back area or alcove changes how the fireplace fits and looks.

Take each size in a couple of places rather than one. Walls are rarely perfectly square, especially in older homes, and the smaller of two readings is usually the one that matters.

Why does the opening size matter so much?

Because it decides what will fit inside the fireplace. The opening is where the fire and chamber go, so if it is wrong the fire will not sit properly, no matter how good the surround looks.

Measure the width and the height of the opening, and note whether it is a straight rectangular opening or a shaped one. If you already know which fire you want, whether that is an electric, gas or stove option, that guides the opening you need. If you do not, we can advise once we have the sizes.

This is also where older Birmingham and West Midlands homes throw up surprises. Openings in period properties are often not standard, which is exactly why measuring properly beats assuming.

Why does made-to-measure mean I am not stuck with standard sizes?

Because we cut the stone to your room rather than making you fit a shelf product. A made-to-measure fireplace is cut to the exact dimensions of your opening and chimney breast, in the stone and colour you choose.

Off-the-shelf surrounds come in set sizes. If your chimney breast does not match one, you either compromise on the look or start filling gaps. Made to measure removes that problem. We take your sizes, then cut and finish the marble or stone in our workshop to suit them.

That matters a lot across Birmingham and the West Midlands, where homes range from period terraces to new builds, and chimney breasts vary widely. A fireplace made to your wall sits right in a way a standard size often cannot.

Do you still measure on site before making?

Yes, always. A made-to-measure piece is only as good as the measurements behind it, so we measure on site or in the showroom before we cut anything. Your own measurements are a helpful start, but they are not where we stop.

When we measure, we check the opening, the breast, the hearth area and the surrounding wall, and we look for the things that are easy to miss from a tape measure alone, such as walls that are out of square or a floor that is not level. Then we make to those sizes.

You can see how this fits into the whole job in how we work, from the first design conversation through to fitting. Because we cut and finish in our own workshop, the measurements go straight to the people making your fireplace.

What are the common measuring mistakes?

Measuring once, and measuring only in the middle. Walls and openings are rarely perfectly even, so a single reading can be off. Take each size in two or three places and use the tightest one.

A few others come up often:

• Forgetting the hearth depth, which affects both the look and any clearance the fire needs.
• Ignoring the ceiling height, which decides whether a surround feels in proportion.
• Missing a recess or a picture rail that changes what will fit.
• Measuring the old fireplace instead of the actual opening and breast behind it.

None of these are a problem if you tell us about them. The mistake is guessing rather than noting them down. And because we measure on site before making, we catch anything that slipped through.

What should I have ready before a consultation?

Your rough measurements, a couple of photos of the chimney breast, and an idea of the fire you want. That is enough to start a useful conversation, whether in the Solihull showroom or over the phone.

You do not need perfect numbers. We will confirm everything when we measure. What helps most is knowing your opening size roughly, the width of the breast, and whether you are after a surround only or a full fireplace with a fire, hearth and chamber. From there we can talk stone, colour and style.

Frequently asked questions

What are the most important chimney breast measurements?

The opening width and height, the chimney breast width, the hearth depth and the ceiling height. Note any recess as well.

Do I need to measure perfectly myself?

No. Your measurements help us plan, but we measure on site or in the showroom before we make, so nothing rests on your figures alone.

How do I measure the fireplace opening?

Measure the width and height of the hole the fire sits in, taking each in a couple of places, and note whether it is straight or shaped.

Why measure the ceiling height?

So the surround is in proportion with the room. A fireplace that suits a tall room can look wrong in a lower one, and the height guides the design.

Can you make a fireplace for a non-standard chimney breast?

Yes. Made-to-measure means we cut to your exact sizes, which suits the varied chimney breasts across Birmingham and the West Midlands.

Do you measure at my home?

Yes. We measure on site or in the showroom before making, so the finished fireplace fits your wall properly.

What if my walls are not square?

That is common, especially in older homes. We check for it when we measure and cut the piece to suit, so it still fits cleanly.

Let us take the measurements for you

You can measure your chimney breast yourself to get started, but you do not have to get it perfect. Visit our Solihull showroom to talk through your room and see the stone, or get in touch and we will arrange to measure your chimney breast and make your fireplace to fit.