Almost every deck gets planned as an attached deck. A ledger bolts to the house, the joists hang off it, and half the structure’s load transfers into the building. That is the default because it is cheaper, and for most houses it works fine.
It is also the connection responsible for most serious deck collapses. A freestanding deck removes it entirely. The deck stands on its own posts and beams on every side, touching nothing, and the failure mode that causes the worst outcomes simply does not exist.
What you pay for that is a second beam line along the house, roughly double the footings, and bracing to keep the frame from racking. This guide covers when that trade is worth making, how a freestanding plan differs from an attached one, and the details that decide whether an inspector agrees your deck is actually freestanding.
What Actually Changes
Two decks, same size, same boards, same joists. Everything different happens along the house wall.
The house-side beam
Instead of a ledger bolted to the wall, a freestanding deck runs a second beam parallel to the house, carried on its own posts and footings. That beam typically sits within a few inches of the wall, close enough that the deck still reads as attached from a distance.
Everything about sizing that beam follows the same tables as the outer one. It carries roughly half the joist span, exactly as the ledger would have, so the load has not changed. Only the thing carrying it has.
The bracing
An attached deck borrows lateral stability from the house. A freestanding one has to generate its own, which means diagonal bracing between the posts and the beam, X-bracing between posts, or an engineered equivalent.
Prescriptive guidance is fairly specific about how knee braces get installed. They attach to each post at a point no less than one third of the post length down from the top, sit between forty-five and sixty degrees from horizontal, and get bolted at both ends rather than screwed or nailed. They belong at corner posts, with X-bracing used instead for interior bays, since bracing a heavily loaded interior post can overstress it.
The one relief worth knowing about: many codes waive lateral bracing for freestanding decks whose walking surface sits thirty inches or less above grade. That combination, low and freestanding, is why so many platform decks are built this way. It is also the shape where clearance under the frame becomes the binding constraint instead.
The footings
This is where the majority of the cost comes from. An attached deck of a given size might need three or four footings. The same deck freestanding typically needs six to ten, because the house-side beam now has its own post line under it. Footing size and depth are unchanged, there are simply more of them.
When Freestanding Is the Right Call
Six situations where attaching is either impossible, risky, or more work than the alternative.
The brick and stone case deserves expanding upon, because it is the one that comes up most often in older Nashville neighborhoods.
Brick veneer on a wood-framed house is a cladding, not a structural wall. It is not designed to carry a deck, and a ledger bolted into brick alone is a genuinely dangerous detail. Attaching properly means reaching through the veneer into the framing behind it with a documented method, which is engineering work rather than carpentry.
A freestanding frame sidesteps all of it. The house-side beam sits a couple of inches off the brick, the deck carries itself, and nobody has to make assumptions about what a hundred-year-old wall will hold.
How a Freestanding Plan Differs on Paper
If you are adapting an attached deck plan or drawing your own, these are the things a plan reviewer will look for.
- Two beam lines on the framing plan. Both sized against the joist span they carry, with post spacing shown for each.
- Every footing is located and dimensioned. Six to ten of them rather than three or four, each with diameter and depth noted.
- A bracing detail. Knee braces or X-bracing shown with the angle, the attachment point on the post, and the fastener type. This is the detail most often missing from adapted plans.
- The air gap called out. A dimension showing the deck does not touch the house. Inspectors look for a visible gap, commonly one to two inches, to confirm the deck is genuinely freestanding.
- No lateral load hold-downs. The hold-down requirement applies to ledger-attached decks. A truly freestanding deck is reviewed under general stability requirements instead, satisfied by the bracing.
- Post-to-beam connections specified. Beams cannot simply rest on posts. Approved post caps or a bolted bearing connection, and toe-nailing is not a substitute.
That fourth point catches people out more than any other. A deck that sits next to the house with a small gap but has any fastening into the wall is still an attached deck as far as code is concerned, and it now needs the ledger requirements it was trying to avoid. Freestanding means genuinely free. This is exactly the kind of detail a complete drawing set has to make explicit rather than leave to the field.
The Honest Trade-Offs
| Freestanding | Attached | |
|---|---|---|
| Highest-risk connection | Eliminated entirely | Present, and the leading collapse cause |
| Flashing at the house | None required | Critical, and a common failure point |
| Beam lines | Two | One |
| Footings | Typically six to ten | Typically three to six |
| Lateral stability | Self-braced with knee or X-bracing | Borrowed from the house via hold-downs |
| Cost | Higher, mostly in footings and labor | Lower |
| Works on veneer walls | Yes | Not without engineering |
| Movement independence | House and deck settle separately | Tied together |
That last row is worth talking about. A freestanding deck and the house it sits beside can settle at different rates without either one dragging on the other. On expansive clay soil, which describes a lot of Middle Tennessee, that independence is a quiet advantage rather than a drawback.
The cost difference is real but smaller than people assume, because the expensive parts of a deck are not the ledger. Framing lumber and footings are a meaningful share of the substructure, and substructure is the largest slice of a deck budget, so adding a beam line and a few footings moves the number without transforming it. On a tall deck the calculation shifts further toward freestanding, since the ledger on a raised structure carries the highest consequence of any connection.
Footings and the Frost Question
One frequently repeated claim needs care: that freestanding decks do not need frost-depth footings.
It is true in some jurisdictions and not in others. Some codes provide explicit relief for decks not connected to a ledger, on the reasoning that a deck free to move slightly with frost heave is not dragging a house connection with it. Other jurisdictions require frost-protected footings regardless of attachment.
Metro Nashville’s residential code does provide relief along these lines, but the deck still has to bear on soil that will not settle, and exterior footings are placed at least twelve inches below undisturbed ground surface. Treat any blanket claim about frost depth as something to confirm with your codes office before you buy materials, not after.
What does not vary is that a freestanding deck resolves every load within its own post and footing system. There is no house sharing the work, which means the footing count and the bearing under each one matter more, not less.
Frequently Asked Questions
What is a freestanding deck?
A deck supported entirely by its own posts and beams on all sides, with no ledger board attached to the house. It carries all gravity, lateral, and uplift loads within its own structure.
Why build a freestanding deck instead of attached?
To remove the ledger connection, which is the leading cause of serious deck collapses. It is also the practical answer on brick, stone, stucco, or cantilevered walls where a ledger cannot be attached safely.
How much more does a freestanding deck cost?
Mainly the cost of a second beam line and roughly double the footings, plus the labor to place them. It is a real increase but a smaller one than most people expect, since the ledger was never the expensive part.
Do freestanding decks need bracing?
Yes, above thirty inches. Diagonal knee braces at corner posts, X-bracing between posts, or an engineered equivalent. Many codes waive bracing for freestanding decks thirty inches or less above grade.
How do you brace a freestanding deck?
Knee braces bolted to each post at a point no less than one third of the post length from the top, angled between forty-five and sixty degrees from horizontal, with bolts at both ends. Use X-bracing between posts rather than knee braces on heavily loaded interior posts.
How close can a freestanding deck be to the house?
A few inches. Inspectors typically look for a visible air gap, often one to two inches, to confirm the deck is not attached. Any fastening into the house makes it an attached deck regardless of the gap.
Do freestanding decks need footings below the frost line?
It varies by jurisdiction. Some codes provide relief for decks with no ledger connection, others do not. Confirm with your local codes office rather than relying on a general answer.
Can I convert an attached deck to freestanding?
In principle yes, by adding a beam line and posts along the house side and then removing the ledger connection. In practice it is major structural work and usually only makes sense during a rebuild.
Does a freestanding deck still need a permit?
Yes. In Metro Nashville any new deck and any footing or framing work requires a permit regardless of how it is supported, and setback rules apply the same way.
The Bottom Line
Freestanding is not an exotic option, it is a straightforward trade. You give up one beam’s worth of savings and take on a few more footings, and in exchange the connection that causes the worst deck failures is not part of your structure at all. On a brick or stone house it is not really a choice, it is the answer.
The practical next step is to find out what your house wall actually is before assuming a ledger is possible. Brick veneer, stone, stucco, EIFS, and cantilevered sections all point one direction. So does an older home where nobody can say with confidence what is behind the siding. Any of the hire Nashville deck builders with experience on older housing stock will raise this on the first visit rather than after the siding comes off.
And if the deck is going to be low anyway, freestanding is close to free. That is the easiest version of this decision anyone gets to make.