Sunroom insulation costs $300 to $1,500 or $1 to $4 per square foot. Higher-quality 4-season sunrooms and conservatories are built with expensive wooden or insulated vinyl framing. Three-season sunrooms have cheaper frames such as aluminum, resin, and vinyl. Sunroom framing is typically aluminum, vinyl, wood, or resin plastic. An existing base may require reinforcing for additional support of the sunroom's weight. Minor foundation repairs for a slab or deck repairs cost $500 to $2,500. Site-built sunrooms require a proper building foundation, while prefab sunroom kits can attach to an existing wooden deck or patio with a level surface. Also, a zoning permit, electrical permit, and a heating-cooling permit may be required.Ī sunroom foundation costs $1,000 to $6,000 or $5 to $15 per square foot on average. Permits – A building permit for a sunroom costs $200 to $500 and are required. Site cleanup – Construction-site cleaning costs $300 to $700 on average. Site preparation – Additional costs apply when building a new foundation such as land clearing, tree removal, excavation, and landscaping. Planning & design – Hiring an architect costs 5% to 20% of the total construction cost to design the structure. Provides an extension of living area.Ĭustom-built glass solarium or conservatory is a high-end 4-season room with all glass walls and glass ceiling. Lights and HVAC can be installed separately.Ĭustom built on a foundation with insulation, electricity, HVAC, and glass windows. Insulated and sealed, but typically lacks HVAC and electricity. 3 or 4-season models.Ĭustom built on a foundation. Higher quality materials, insulated panels, customizations. High-end prefab sunroom from name-brand dealers. Typically no insulation, HVAC, or electrical. Lack a foundation and insulation.īuilt on top of an existing deck or patio. Typically prefab kits with glass or plastic panels. Prefab kits are premade, delivered, and assembled on an existing deck or patio. The cost to add a 3-season room is $80 to $230 per square foot, and a custom-built 4-season sunroom runs $200 to $400 per square foot. The most popular sunroom sizes are 12'x12' and 16'x24'.Ī sunroom addition costs $100 to $350 per square foot installed on average. Three-season sunrooms are additions enclosed with glass but lacking insulation and HVAC systems.Ī sunroom adds extra living space, increases a home's appraisal value, adds curb appeal, and yields a 50%+ return on investment. An all-season or 4-season room integrates into the existing construction of the home with insulation, electricity, and an HVAC system.
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