Blocking 101: The Small Decision That Changes Everything Later

Blocking is the cheapest upgrade in custom construction. It's a piece of two-by-four nailed between studs before the drywall goes on, so that twenty years from now you can hang a TV, a towel bar, or a grab bar exactly where you want it — instead of into hollow drywall held by plastic anchors.

Blocking takes a framer five minutes per location. Adding it after drywall takes a homeowner six hours and a smaller wallet. We've never had a client regret over-blocking. We've had hundreds wish they had.

The rule

If anything will ever be mounted to that wall — now or in 30 years — there should be blocking behind the drywall. Not somewhere near. Behind it, exactly.

The complete list

Walk every room in your plan with this list, before drywall day. Mark blocking locations on the plans and on the studs in the wall with a Sharpie. Take photographs after blocking is installed, before drywall.

Every TV location, current or potential

• Primary living room — center wall and over-fireplace
• Primary bedroom — wall facing the bed
• Kitchen — small TV niche if you watch while cooking
• Home office, gym, garage — any wall where a TV might land
• Patio / outdoor living — outdoor-rated TV mount

Block in a 4-foot-wide horizontal band at TV mount height (typically 48–60" to center). You'll thank yourself when you decide the 65" is now the 85".

Every bathroom

• Behind every toilet — for paper holder, grab bars, future bidet
• Beside every shower — for grab bar (even if you skip the install)
• Inside every shower — robe hook, hand-held shower bracket
• Behind every vanity — for towel ring, faucet trim
• Above the tub — for hand-held shower or fill spout
• Behind the door — for robe hook

Closets

• Every wall where a closet rod or shelf will land — top, middle, and bottom shelf heights
• Every island base in walk-in closets
• Behind any built-in seating

Kitchen

• Every wall cabinet location — top and bottom of the cabinet
• Hood location — the structural support for a heavy stainless or custom hood
• Backsplash band — for floating shelves, pot rails, organizer rails
• Beside the refrigerator — for a wall-mounted paper-towel holder or hook

Mudroom & entry

• Bench wall — for bench mounting and back support
• Hook rail — across the full wall, at 48" and 60" heights
• Above any mail-drop or charging shelf

Bedrooms

• Headboard wall — for hanging upholstered headboards
• Either side of the bed — for swing-arm sconces or art
• Above dressers — for mirrors

Living & family rooms

• Every wall over the sofa back — for art, gallery walls, sconces
• Fireplace surround — for mantel mounting
• Floating shelves on either side of the fireplace or TV

Office, library, study

• Every wall that may ever hold built-in shelving
• Behind a desk — for monitor arms, pegboards, organizer systems

Garage

• Every wall where you'll mount bike hooks, kayak racks, ladder hangers, or shelving
• Ceiling — for overhead storage racks
• Beside the garage door opener — for keypads and remotes

Outdoor

• Beside every exterior door — for hose reels, hooks, baskets
• Every wall where outdoor lighting, address numbers, doorbells, cameras will mount
• Pool equipment area — for pool floats, towel hooks
• Eaves and soffits — for permanent holiday-light receptacles

Walk the house with a roll of blue tape the week before drywall. Tape the wall everywhere anything might ever hang. Then add blocking everywhere you taped.

What blocking actually is

For your reference when talking to the framer:

• Standard blocking: 2x6 or 2x8 lumber nailed horizontally between two studs, flush with the front edge of the studs. Drywall covers it. You drill into it later.
• Plywood blocking: A sheet of 3/4" plywood spanning multiple studs, used for heavy or wide loads (large TVs, kitchen cabinet runs).
• Backing: Sometimes used interchangeably with blocking.

Tell your framer: "Use 2x8 for TV blocking, plywood for cabinet runs, 2x6 for everything else." They'll know what to do.

Cost

Adding comprehensive blocking to an average custom home costs $400–$1,200 of additional framer time. That's a rounding error against your construction budget. The cost of opening drywall later to add blocking averages $300–$800 per location, depending on access, finish, and paint.

The math is hard to argue with.

The honest takeaway

The framer doesn't know what you'll mount where. Your architect doesn't either. Only you do. The blocking conversation is yours to start. Start it. Walk the house with your designer and framer the week before drywall, and add blocking everywhere you might ever want to hang anything.

It's the cheapest upgrade you'll make on the whole project. It's also one of the few decisions that's still paying you back at year 25.

— Want our internal blocking checklist as part of the larger pre-drywall walkthrough? Download our free Ultimate Home Building Checklist — blocking is one of the three hundred items inside.