When designing a fireplace, one of the key elements to consider is the hearth. Not only does it play a functional role in protecting the floor, but it also contributes significantly to the overall aesthetics of the fireplace.
Traditionally, in homes with chimneys, you’d find a constructional (sub) hearth made as a thick slab of concrete, topped with a decorative surface. A sub-hearth is essential when burning solid fuel, as it provides a non-combustible base that meets fire safety regulations. However, with the rise of “cool hearth rated” stoves – typically models with legs that keep the base temperature below 100°C – a sub-hearth may no longer be necessary to have a stove installed.
A constructional hearth extends in front of and to either side of the fireplace opening, creating a safe zone. Gas fires do not require a sub-hearth, a decorative hearth can be placed directly on top of flooring, with suitable heat insulation in between. A decorative hearth boundary must remain clearly visible to prevent combustibles materials such (such as a rug in front of the fireplace) to be placed too close.
As a general guidance, the size of the decorative hearth will depend on the type of fire/ appliance.
- Open fronted solid fuel fires (such as grates and cast iron inserts)require hearths to extend at least 300mm from the front of the fire but 450-500mm is recommended for extra safety, with a minimum of 150mm extending to either side of the fireplace chamber.
- Solid fuel stoves require a minimum depth of 225mm from the front of the stove but the hearth should be as deep as the projection of the stove door when opened, as the best practice.
- A freestanding stove will require a hearth of 840 x 840mm minimum.
- Open and glass fronted gas fires fitted at floor level require hearths to extend at least 300mm from the front of the fire and a minimum of 150mm either side.
- If a gas fire is installed at certain height (typically 225mm+ off the floor) it may not need a hearth at all, a simple minimalistic Hole In The Wall scenario desired by many.
However, always check the installation manual for specific manufacturer’s requirements (or let us do the job for you).
When choosing a hearth material, it’s important to balance visual appeal with durability and practicality.
Honed Slate
The most traditional material for the hearth. Dark and uniform in colour, it complements black and graphite polished cast iron inserts so it is a popular choice. Although it is hard wearing, it is prone to scratches so be mindful of this if you plan to place a companion set or a coal bucket on it. Occasional re-oiling helps maintain its finish and protect the surface.
Granite
Is a strong contestant when it comes to popularity of hearth materials. Honed Nero granite is dark grey in colour, its darkness is enhanced by oiling or sealing honed granite for protection. Polished granite provides a glossy finish that complements many modern fireplace designs. It has a little bit more natural variation but is also more durable when compared to slate.
Limestone and Marble Hearths
Are a classical choice particularly popular with gas fires where there is minimal risk of ash staining. Aegean Limestone is lighter and more uniform than Rosal Portuguese Limestone (also known as Branco) which has a greater number of fossil inclusions in the stone and is a tone darker in colour. Marble is known for its mesmerising veining and its polished surface creates a high-end, sophisticated finish – a historic prestige that still feels relevant in contemporary interiors.
Tiled hearths
Are a fantastic way to add colour and character to your fireplace. Whether you’re recreating a classic Victorian look with traditional patterns of glazed tiles or following a new trend where the hearth pattern follows the tile design inside the fireplace chamber, a tiled hearth will allow you to make a bold statement. Tiles are not only visually striking but also highly practical. Some are particularly resistant to heat, they are easy to clean and durable.
Whether you prefer the traditional charm of slate, the practicality of granite, the refined elegance of marble, or the creative flair of tiled designs, the hearth is more than just a practical base – it’s the foundation of your fireplace’s personality.