Lanai Extension in St. Cloud FL

St. Cloud Pro Concrete pours lanai extensions in St. Cloud FL: new slab beyond the builder's small back porch, doweled to the old one, sized for a bigger screen enclosure or an aluminum patio roof, and kept the Florida Building Code's 4 inches below the wall finish. Concrete patios in the Orlando area run $4 to $7 per square foot (Angi, 2026), and the City of St. Cloud permits the slab with the enclosure or roof that goes on it.

Lanai extension in St. Cloud FL: why the slab comes first

Many St. Cloud houses were built with a lanai just deep enough for a table, under the main roof. Extending it means new concrete out into the yard, and then either a screen enclosure wrapped around it or an insulated aluminum patio roof over it. The enclosure or roof company draws the plan; the concrete has to match it, with a thickened edge or footings where the posts land and anchors where they bolt down.

Enclosure or roof plan in hand before the forms go in, so post locations are known.
New slab doweled to the old lanai slab so the two stay level with each other.
Surface kept at least 4 inches below the stucco or siding on the house.
Slope away from the house toward the yard, with the screen wall's kick plate considered.
Condensate line, downspouts and sprinkler heads moved to discharge a foot or more from the house.

Aerial view of single-story homes and long concrete driveways among trees in Florida — Long driveways and big lots in a wooded Florida neighborhood.

Permits: the slab and the structure

The City of St. Cloud's 2026 fee schedule (Resolution 2026-048R) prices these jobs as additions, with separate lines for new and existing concrete. Plan review and administrative percentages are added to the base fees.

City of St. Cloud base permit fees for lanai work (2026)

Permit line	Base fee
Screen enclosure, new concrete	$105.00
Screen enclosure, existing concrete	$75.00
Screen enclosure, concrete pad with roof	$95.00
Patio roof, new concrete	$100.00
Patio roof, existing concrete	$70.00
Concrete pad alone (residential other)	$60.00

Source: City of St. Cloud Building Fee Schedule, Resolution 2026-048R, Exhibit A. In unincorporated Osceola County, screen rooms and pool screen enclosures are permitted by the county; see the county guide.

Outside city limits the county permits it; the Osceola County guidehas the county's slab fees, and the St. Cloud guidethe City's exemption rules.

The termite rules next to the house

Clearance

The Florida Building Code wants at least 6 inches between wall coverings and grade so termite tubes can be seen, with an exception for a 4 inch inspection space above patio and garage slabs. A lanai slab poured right up to the stucco hides that strip. A soil-treated patio on masonry construction may come up to the interior floor level, another listed exception.

Treatment

When the house was protected with soil treatment, the code also calls for treatment under all exterior concrete within 1 foot of the walls. The termite pretreatment guide quotes the sections; a licensed pest control company handles the treatment itself.

Concrete floor of a new screened porch beside a door, with a newly graded lot beyond the screen — The concrete floor of a new screened porch, before the furniture.

Worked example

Tripling a 10 by 12 lanai under a new screen enclosure

In this example a 2010s house has a 10 by 12 foot lanai under the roof, and the owners want a 24 by 15 foot screened area. The enclosure company's plan sets the post spacing; the new slab is poured to that edge with a thickened footing under it and doweled to the existing lanai.

The new slab steps down slightly from the old one to keep the 4 inch gap below the stucco on the side wall, and the AC condensate line is extended past the new edge before the pour.

About 240 sq ft of new slab at the Florida slab rate, $5.38 to $12.83 per sq ft (concreteslabcost.com)	$1,290 to $3,080 (typ. about $1,900)
Thickened edge along the new enclosure line	Priced from the enclosure plan
City permit: screen enclosure on new concrete, base fee	$105 plus review fees

A worked example, not a past job or a quote. The enclosure itself is a separate contract with an aluminum enclosure company.

Lanai Extensions in St. Cloud: Questions

Screened patio with a concrete floor, a ceiling fan and red-cushioned patio furniture looking out on a lawn

A concrete patio slab under a roof and screen, with cushioned seating.

What is a lanai extension?

In Florida a lanai is the covered or screened patio at the back of the house, and a lanai extension means enlarging it: pouring more slab beyond the builder's original one, and usually extending the screen enclosure or the roof over the new area. The concrete comes first, sized and thickened where the enclosure's posts or the roof's columns will land.

Do I need a permit to extend a lanai slab in St. Cloud?

Yes. The City of St. Cloud permits the slab with the structure that goes on it: its 2026 fee schedule lists a screen enclosure on new concrete at a $105 base fee and a patio roof on new concrete at $100, against $75 and $70 on existing concrete. Outside city limits Osceola County permits screen rooms and enclosures.

How far below the stucco should a lanai slab sit?

The Florida Building Code's termite inspection rule allows a 4 inch inspection space above patio slabs, as an exception to its normal 6 inch clearance between wall coverings and grade. Keeping the new slab at least that far below the bottom of the stucco keeps the wall's base visible for termite inspections.

Can the existing screen enclosure be reused?

Often the aluminum can be rebuilt larger rather than replaced, but that is the enclosure company's call. What the concrete has to provide is a slab edge or footing where the new posts will sit, poured to the enclosure's plans.

Lanai Extension in St. Cloud FL