Short answer: this page does not quote prices, because no local price source was solid enough to cite. It covers the choices and site conditions that make Christiansburg quotes differ, so you can ask each bidder the same questions. Several of them are specific to the Town: how it treats patios and low decks, how many steps you add, the limestone ground, and where runoff goes in the Towne Branch area.
First, confirm you are in Town limits. Christiansburg runs its own building inspections. If the property is outside the Town in Montgomery County, the County's rules apply instead.
Patio or low deck: does the choice change the paperwork?
It can, and it is one of the first forks in a Christiansburg project. The Town's residential decks handout says:
- A concrete patio needs no building permit, but it does need zoning approval and a plat.
- A deck less than 16 inches above finished grade at all points is treated like a patio: a zoning permit and setback inspection, but no building permit.
- A deck higher than that needs a building permit.
So a ground-level patio and a very low deck can carry similar paperwork, while a taller deck adds a building permit and inspections. When comparing a patio to a deck, compare the full path, not just the surface.
How many steps?
The same handout says adding or replacing steps with 5 or fewer risers needs no permit, plan or zoning approval. That is a useful line when designing a patio that sits a little below or above the door. A layout that keeps the steps to five risers or fewer can avoid a step permit. A taller drop may push the design toward a landing, a low wall, or a deck.
What does the ground do to the scope?
Christiansburg sits on limestone country. A Virginia Tech geology thesis describes the Town's map area as underlain by sedimentary rock, including highly fractured carbonate rock. Virginia DCR says karst, or sinkhole terrain, is concentrated where limestone and dolomite underlie the Valley and Ridge. Its sinkhole guidance tells homeowners not to send roof, gutter or stormwater runoff into sinkholes, and to get qualified help rather than simply filling one.
For a hardscape project, that means:
- the drainage plan for a new patio should not end in a low spot that might be a sinkhole
- if the ground opens during digging, the plan changes, and the quote should say how that is handled
- rock near the surface can slow digging for footings
Where does the runoff go?
New paving sheds water faster than lawn. In the Towne Branch watershed, the Town's Downtown Watershed Study describes a 1,284-acre area that includes downtown and several neighborhoods. A September 29, 2015 storm flooded parts of it, and the residential area along Phlegar and Chrisman Streets was hit hard. The Town later set up a Stormwater Enterprise Fund.
Even outside that watershed, a good quote shows how a patio is sloped and where water leaves it. Gutters that dump onto new paving, or paving that slopes toward the house, are the most common problems. The drainage guide covers fixes.
How deep do footings go?
Montgomery County's structural design criteria list a 24-inch minimum frost depth. Since the Town runs its own inspections, confirm the depth with the Town. Footings for walls, steps and fire features are set by that depth. The County's water authority uses a deeper figure, 25 to 30 inches, for water lines, so if a project crosses or moves an outdoor water line, that is a separate question.
What about walls?
Retaining walls cause the biggest swings in scope. The Town's retaining wall guidelines step up from no permit, to a permit, to a design, to a stamped design as walls get taller. Check the current rule with Building Inspections before pricing a wall. The patio, deck and wall permits page on this site sums up where to start.
How do you compare two quotes?
Ask each bidder:
- Who handles zoning approval and the plat for a patio?
- If it is a low deck, will it stay under 16 inches at every point?
- How many risers do the steps have?
- Where will runoff go, and is any sinkhole risk known?
- How deep are footings, and what happens if rock is hit?
- Who calls Virginia 811? The hired contractor is responsible, but confirm it is done at least 3 working days before digging.
What to gather before you ask for a quote
- Confirmation the lot is inside Town limits, and a copy of your plat if you have it
- Photos of the doors, the area, and the drop from the door to the yard
- Where gutters drain now and where water stands after rain
- Whether you are weighing a patio against a deck
- Any HOA or covenant rules
Local rules and sources on this page were checked on October 8, 2026. Requirements change; confirm with the responsible office before work begins.
- Patio, Retaining Wall, or Fire Pit First? | Christiansburg
- Expand or Replace an Old Patio in Christiansburg, VA
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