Built-In Cabinets Around a Fireplace: Plans

Before you plan: fireplace type, clearances and code

Safety comes first with this project, because cabinets are made of combustible material and a fireplace produces heat. Before drawing anything:

Identify what you have. A wood-burning masonry fireplace, a factory-built (prefabricated) fireplace, a gas insert, a wood stove and an electric fireplace all have different requirements.
Find the manufacturer’s instructions. For factory-built and gas units, the installation manual specifies clearances to combustible materials such as wood trim, mantels and cabinets. If you do not have the manual, look up the model number or contact the manufacturer.
Check local building codes. Codes address clearances for mantels, trim and combustible materials around fireplaces and vary by region. Ask your local building department what applies and whether a permit or inspection is needed.
Consider a qualified professional. A certified chimney sweep, fireplace installer or inspector can confirm that the fireplace is in good working order and tell you what can safely sit nearby.
Do not guess at clearance numbers. The right distances depend on the appliance and local rules, so use the documented figures for your situation rather than a rule of thumb from a website.

Many built-in designs keep a clear, non-combustible zone (such as stone, brick or tile) immediately around the opening and place the cabinetry beyond the required distance. Your plan should start from that boundary.

Layout ideas that work around a fireplace

Design articles on this subject show a wide range of options, which fall into a few families:

Symmetrical bookcases on both sides of the fireplace, often with closed cabinets below and open shelves above.
Closed-door storage to hide clutter, games or electronics.
Glass-front cabinets to display objects while keeping dust off.
Built-in seating such as a bench with storage underneath.
A bar or display niche in one of the flanking units.
Asymmetrical designs where the fireplace is off-centre.
Arched or recessed niches for a more architectural feel.
A firewood niche, if you burn wood. Keep stored wood within the clearances and guidance for your appliance, and do not store kindling near the firebox opening.
Wood details that echo brick or stone, for a rustic look.

For the wall area above and around the unit, you may also like our ideas in what to use for a wood accent wall and our guide to wall paneling woods.

Planning the build

Measure and check for level and plumb

Walls, floors and fireplace faces are rarely perfectly square. Measure width, height and depth at several points, and note the largest and smallest numbers. Check the floor for slope with a level and look at how far the fireplace projects from the wall. Cabinets are usually built slightly smaller than the opening and then trimmed to fit.

Decide how the unit is built

A common approach for built-ins is to make a series of separate plywood boxes (carcasses) and join them on site, rather than building one huge structure that has to be carried in and fitted at once.

A typical modular plan:

Base cabinets on each side, with a separate base frame or platform that can be shimmed level.
Upper bookcases or cabinets that sit on or beside the bases.
Face frames (a front frame of solid wood) to hide plywood edges and give a finished look.
Trim, such as crown moulding, scribe moulding and baseboard, to blend the unit into the room.

Cabinet-building concepts such as pocket-hole joinery, face frames and box construction are covered in other plans like our corner hutch plans, and the same ideas carry over.

Materials

Plywood (3/4 inch is a common thickness for cabinet boxes) is stable and holds screws well. A hardwood-faced or paint-grade birch type is typical (see plywood grades for cabinets). Choose the face quality based on whether it will be painted or stained.
Solid wood for face frames and trim. Poplar is often used for painted work, and a hardwood species for stained work.
MDF can be used for painted trim and panels, but it is heavy and creates fine dust (see how strong MDF is).
Back panels can be thin plywood or a panel product. Consider leaving a cutout where cords or ventilation are needed.
Hardware: adjustable shelf supports, hinges, drawer slides, pulls.
Fasteners and glue: wood glue, screws, finish nails, and construction adhesive where appropriate.

Remember that thin or unsupported shelves can sag under heavy books. Keep spans moderate, add a front edge strip or a support in the middle, and check the shelf material’s load limits.

Step-by-step build overview

This is an outline of the process, not a complete dimensioned plan, because every fireplace is different.

Draw the plan to scale, with the confirmed clearance zone around the fireplace marked and left clear.
Make a cut list from your drawing. Keep the same side height and depth across all base boxes for a uniform look.
Cut the plywood to size. Use a track saw, table saw or circular saw with a guide. Support the sheet fully, wear eye and hearing protection, and keep your hands away from the blade path.
Drill shelf-pin holes and any pocket holes before assembly.
Assemble each box with glue and screws, checking for square as you go.
Build or attach the base and level it. Shim as needed.
Set the boxes in place, clamp them together, and screw them to each other and to wall studs (our tips for installing kitchen cabinets cover leveling and fastening).
Add the face frames, with glue and pocket screws or finish nails.
Install scribe strips along walls that are not straight, trimming them to follow the wall.
Add trim and moulding.
Fill, sand, prime and finish.
Hang doors and fit shelves.

If you build in your shop and then move the boxes, measure doorways and stairs first. Large units are often easier to build in sections.

A TV above the fireplace: things to check

A TV above a fireplace is a popular request, but it needs thought:

Heat. Heat rising from a fireplace can affect electronics. Consult the TV manufacturer’s guidance about operating temperatures and the fireplace manufacturer’s guidance on what can be installed above the opening.
Viewing height. A TV mounted high can be uncomfortable to watch for long periods.
Mounting. Fix the mount to framing or solid blocking, not just the surface layer, and follow the mount’s rated weight limits.
Concealed designs. Hidden-TV cabinets with doors or panels need ventilation for the equipment and should not trap heat.
Wiring. Plan the power and cable route early. In-wall power wiring should follow electrical code; hire a licensed electrician for new circuits, outlets or in-wall cable ratings.

Lighting and wiring

Lighting makes built-ins look more finished. Options include LED strips, puck lights, recessed lights or small picture lights. Low-voltage LED systems are popular for DIY use, and plug-in drivers keep the wiring simple. Keep any wiring and drivers away from heat sources, ensure they are rated for the location, and leave access to power supplies for later replacement. Any hard-wired electrical work should be done by a qualified electrician.

Finishing and installing

Pre-finishing parts before installation is usually easier than finishing in place. Common finishes are paint (for a clean, built-in look) and stain with a clear coat; see our wood finishes guide. Follow the product’s directions for preparation, ventilation and drying time.

If the finish is oil-based, be careful with used rags, since some can generate heat as they dry and ignite. Lay them flat outdoors to dry, or put them in water in a sealed metal container, as the label directs. Keep flammable finishes away from pilot lights, heaters and other ignition sources, and make sure the fireplace is cold and not in use while you are working with them.

Safety: tools, dust, fumes and flammable finishes

Wear eye and hearing protection when using saws, drills and nailers.
Use a respirator or dust mask rated for fine dust when cutting and sanding plywood and MDF, and use dust extraction where possible.
Keep the work area ventilated when gluing and finishing.
Unplug saws before changing blades, and use push sticks or guides.
Use a stable ladder for upper units, and ask for a second person when lifting cabinets.
Anchor tall units to wall studs to reduce tipping risk.
Check for hidden wiring and pipes before drilling into walls.

Frequently asked questions

Can I build cabinets right up to the fireplace opening? Not without checking. Clearance requirements to combustible materials depend on the fireplace type, the manufacturer’s instructions and local code. Verify them first.

What material is best for fireplace built-ins? Plywood boxes with solid wood face frames are a common approach. MDF can work for painted trim. The right choice depends on the finish and your budget.

Should I build in place or in the shop? Modular boxes built in the shop and installed on site are often more practical. Trim and scribing are usually done on site.

Do I need a permit? It depends on where you live and what you are changing. If you touch the chimney, firebox, gas lines or electrical, a permit or inspection is more likely. Ask your local building department.