Patio to Sunroom & Lanai Cost Guide

Converting an open outdoor space into a functional, weather-protected living area is one of the most effective ways to expand usable square footage in South Florida. Preventive Maintenance builds patio lanais, converts existing patios into fully enclosed sunrooms, and constructs complete custom home additions. Whether enclosing an existing slab with an insulated aluminum roof or building a fully conditioned glass enclosure tied directly into your home's structure, we handle the entire project from design and permits through complete construction.

Key Takeaways

  • Converting an existing patio into a lanai or sunroom adds functional, weather-protected square footage tailored to South Florida climate demands.
  • Expect costs to average about $52 per square foot for an aluminum lanai or $65 per square foot for a conventional lanai on an existing slab, while air-conditioned additions average about $250 per square foot.
  • The typical project timeline spans 3 to 6 months from initial site inspection and architectural design through HOA approval, permitting, and final inspection.
  • High-Velocity Hurricane Zone structural tie-ins require single-source contracting covering plans, permits, insulated roofing, electrical, plumbing, and dedicated HVAC installation.

    • Who This Is For

    This guide is designed for South Florida homeowners who want to maximize their outdoor or semi-enclosed living spaces. Living in Palm Beach or Broward County means dealing with extreme heat, intense humidity, torrential rain, and persistent insects, as well as strict High-Velocity Hurricane Zone (HVHZ) building codes.

    Converting your outdoor space is ideal if you want to:

    • Eliminate insect pests while retaining outdoor breezes and sunlight.

    • Protect outdoor furniture and appliances from rain and UV damage.

    • Expand your indoor square footage with a climate-controlled sunroom or home addition.

    • Boost overall property value and curb appeal with integrated architectural elements.

    What We Build for Each Service

    Preventive Maintenance delivers three distinct levels of enclosure and expansion services depending on your goals, existing foundation, and budget.

    1. Patio Lanais

    A patio lanai provides open-air shelter or screened protection over an existing concrete slab or paved patio.

    • Materials: Structural aluminum framework with heavy-duty insect screening or vinyl panelling.

    • Roofing: Insulated aluminum roof panels engineered to deflect solar heat gain and withstand high winds.

    • Climate Control: Naturally ventilated; non-air-conditioned.

    2. Patio to Sunroom Conversions

    A sunroom conversion transforms an existing covered or open patio into a fully enclosed, glass-walled room.

    • Materials: Impact-resistant glass windows, sliding glass doors, insulated wall panels, and reinforced framing.

    • Roofing: Insulated aluminum roof paneling or integrated flat TPO/sloped concrete tile roof structures.

    • Climate Control: Fully air-conditioned via ductless mini-split or extension of existing HVAC ductwork.

    3. Full Home Additions

    A complete addition expands your home's footprint outwards with permanent floor-to-ceiling construction.

    • Materials: CBS (concrete block structure) or heavy timber framing, concrete foundation extension, drywall interior, and custom finishings.

    • Roofing: Seamlessly matched flat TPO or sloped concrete tile roof tied directly into the primary residence.

    • Climate Control: Integrated central HVAC with full electrical and optional plumbing services.

    Comparison of Enclosure Options

    Feature / Service Patio Lanai Patio to Sunroom Conversion Full Home Addition
    Primary Structure Aluminum framing & screening Glass walls over existing slab CBS or heavy timber framing
    Roofing Type Insulated aluminum Insulated aluminum or flat TPO / tile Flat TPO or sloped concrete tile
    HVAC & Insulation Non-conditioned Dedicated AC & insulated glass Full central HVAC & code insulation

    Process

    1. Initial Inspection & Consultation: We perform an on-site structural evaluation of your existing concrete slab, roofline, and tie-beam connections.

    2. Design & Architectural Plans: Our engineering team drafts exact structural plans tailored to HVHZ wind standards and local building codes.

    3. HOA & Board Approvals: We prepare and submit all required plans, finish samples, and site diagrams to your Homeowners Association.

    4. Permits & Municipal Submission: We apply for and manage all required building, electrical, plumbing, and mechanical permits with your city or county building department.

    5. Site Preparation & Framing: Foundations are prepared or reinforced, followed by structural aluminum or wood/CBS framing and roof tie-ins.

    6. Enclosure & Roof Installation: Installation of insulated roof panels, TPO/tile roofing, impact glass, and screen walls.

    7. Electrical, Plumbing & HVAC Rough-In: Single-source installation of lighting, outlets, fan connections, water lines, and air conditioning equipment.

    8. Finishing & Final Inspections: Wall finishes, flooring, trim, and detail work are completed before passing final municipal inspections.

    Cost Considerations

    Pricing for outdoor living conversions depends on structural requirements, material selections, and climate control needs.

    Service Option Estimated Cost Notes
    Aluminum Lanai ~$52 / sq. ft. Built on an existing concrete slab with insulated aluminum roof.
    Conventional Wood/Concrete Lanai ~$65 / sq. ft. Heavy-duty framing built on an existing concrete slab.
    Air-Conditioned Sunroom Addition ~$250 / sq. ft. Complete structural enclosure with AC, electric, and roof tie-in.
    New Home Construction (Comparison) ~$350 / sq. ft. Baseline comparison cost for new primary home construction.

    Note on Conversions: There is no single per-square-foot price for patio-to-sunroom conversions. Final costs depend on whether the existing roof and concrete slab can be retained, as well as your choices for impact glass, insulation, electrical wiring, and HVAC installation. Most custom projects range from 12' x 20' to 20' x 20', though custom dimensions of any size are available.

    Timeline, Permits, HOA, and HVHZ Requirements

    Projects typically take 3 to 6 months from initial inspection to final sign-off. The timeline accommodates architectural plan creation, HOA review cycles, municipal permitting, and structural construction.

    Because South Florida falls within the High-Velocity Hurricane Zone (HVHZ), all structures must withstand extreme wind loads without snow or ice considerations. Structural tie-ins are completed using engineered ledgers or joists and trusses anchored directly to the house tie-beam. As a single-source general contractor holding 5 state contractor licenses and EPA licenses, Preventive Maintenance manages all structural, roofing, electrical, plumbing, and mechanical permits directly.

    Areas Served

    We provide complete lanai, sunroom, and home addition services across Palm Beach County and Broward County, Florida.

    Palm Beach County

    • Jupiter

    • West Palm Beach

    • Boynton Beach

    • Delray Beach

    • Boca Raton

    Broward County

    • Pompano Beach

    • Fort Lauderdale

    • Pembroke Pines

    Frequently Asked Questions
    Yes, provided the existing concrete slab meets local structural and thickness requirements for supporting walls and glass enclosures. During our initial site inspection, we evaluate slab depth, footings, and moisture barriers to ensure compliance with South Florida building codes.
    Roof tie-ins are constructed using structural ledgers or engineered joists and trusses attached directly to the existing concrete tie-beam of your home. Depending on the design, roof structures utilize insulated aluminum panels, flat TPO roofing membranes, or sloped concrete tiles.
    If you want the space counted as habitable, conditioned indoor square footage, an air conditioning system is required. We typically install ductless mini-split systems or extend existing ductwork to maintain comfortable indoor temperature and humidity levels year-round.
    HOA reviews typically take 2 to 4 weeks, while municipal permit reviews in Palm Beach and Broward counties range from 4 to 8 weeks depending on the jurisdiction. Because we handle all drafting, engineering, and submittals in-house, we streamline approvals as efficiently as possible.
    An aluminum lanai is a screened or open-air structure built with aluminum framing and an insulated roof, designed primarily for insect and sun protection without climate control. A sunroom addition is a fully enclosed, insulated structure with glass windows and AC, functioning as an extension of your home's indoor living space.
    Enclosing a patio or building an addition requires multiple trades, including framing, roofing, electrical, HVAC, and sometimes plumbing. Working with a single-source contractor ensures seamless coordination, a single permit umbrella, consistent quality, and a faster timeline without sub-contractor delays.

    Contact Us Today for a Free Estimate

    561-239-8804

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