Ontario Home Additions Costs & Prices
Ontario, California. The Ontario Home Additions Cost Report is a concise report on everything you need to know about the cost of home additions in the Ontario area.
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Average Home Additions Cost in Ontario
We have done a little research to find the average cost of home additions in Ontario. Here are the average costs and prices reported back to us:
Cost of Building a Home Addition in Ontario, California$131.71 per square foot for standard grade construction (Range: $101.77 - $161.65) Free Estimates from Local ProsCost of Building a Garage Addition in Ontario, California$47.90 per square foot (custom designed, standard grade) (Range: $41.91 - $53.88) Free Estimates from Local ProsCost of Building a Sunroom in Ontario, California$124.19 per square foot (three-season room) (Range: $102.06 - $146.32) Free Estimates from Local ProsCost of Dormer Addition in Ontario, California$3,741.41 for single-window gable dormer (Range: $3,543.86 - $3,938.95) Free Estimates from Local ProsCost of Building a Closet in Ontario, California$1,855.00 for standard bedroom closet (4 ft reach-in) (Range: $1,771.22 - $1,938.78) Free Estimates from Local Pros |
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Ontario Home Additions Cost Data
Professionals in the Ontario area have provided information about how much home additions cost(s). Here are some of the individual reports:
91761, Ontario, California - January 18, 2023
Building a Closet$1,817.91 - $1,989.90 for standard bedroom closet (4 ft reach-in)
This estimate includes closet installation. Cost does include wall framing, drywall installation, and builder-grade finishes (rod, door, hinges, etc.). There is an additional charge for built-in shelving, custom organization systems, and walk-in closets.
Reported by:
ProMatcher Research Team |
91761, Ontario, California - November 14, 2022
Building a Sunroom$104.75 - $150.18 per square foot (three-season room)
Includes labor for sunroom installation. Cost accounts for adding a three-season room to an existing structural base, installing standard-grade windows, siding, roofing and fixtures, and installing electrical access. No installing insulation, extending heating and/or cooling system, installing plumbing, and pulling permits included.
Reported by:
ProMatcher Research Team |
91761, Ontario, California - December 10, 2021
Building a Home Addition$107.27 - $170.40 per square foot for standard grade construction
Cost accounts for the price of building a home addition. Does include standard materials (windows, siding, roofing, electrical, fixtures), construction permits, and waste removal. Price does not take into account construction drawings, premium finishes, and deep foundations.
Reported by:
ProMatcher Research Team |
91761, Ontario, California - May 16, 2021
Building a Garage Addition$44.17 - $56.79 per square foot (custom designed, standard grade)
This garage construction cost estimate considers the cost of labor. Price takes into account standard materials and project cleanup. Excludes blueprint preparation.
Reported by:
ProMatcher Research Team |
91761, Ontario, California - October 29, 2020
Dormer Addition$3,735.52 - $4,151.98 for single-window gable dormer
Includes price of labor for window dormer installation. Includes standard-grade materials and supplies to build gable dormer with one average-sized window. Cost excludes room-size additions, permits, interior finishes, hip roof dormers, shed dormers, home electrical wiring, or plumbing, .
Reported by:
ProMatcher Research Team |
92507, Riverside, California - January 18, 2023
Building a Closet$1,620.56 - $1,773.88 for standard bedroom closet (4 ft reach-in)
Price includes closet building. Estimate takes into account framing walls and hanging drywall to add a closet to an existing room (4 ft wide). Cost does not account for shelving systems, storage solutions, cabinets, lighting, or larger closets.
Reported by:
ProMatcher Research Team |
92878, Corona, California - January 18, 2023
Building a Closet$2,261.59 - $2,475.54 for standard bedroom closet (4 ft reach-in)
This is the average price range for closet building. Almost all quotes include demolition, framing, drywall, and finishing for reach-in closet (48" wide and 28" deep). This rate does not include shelving systems, storage solutions, cabinets, lighting, or larger closets.
Reported by:
ProMatcher Research Team |
92584, Menifee, California - January 18, 2023
Building a Closet$1,833.76 - $2,007.24 for standard bedroom closet (4 ft reach-in)
The is a rough estimate for the cost of closet installation. This ballpark estimate includes framing walls and hanging drywall to add a closet to an existing room (4 ft wide). There will be an extra charge for larger sized closets, custom shelving construction, high-end closet organization systems, and cabinetry.
Reported by:
ProMatcher Research Team |
92879, Corona, California - January 18, 2023
Building a Closet$1,836.64 - $2,010.39 for standard bedroom closet (4 ft reach-in)
Price quote considers the cost of closet installation. Items included: wall framing, drywall installation, and builder-grade finishes (rod, door, hinges, etc.). Cost excludes built-in shelving, custom organization systems, and walk-in closets.
Reported by:
ProMatcher Research Team |
92401, San Bernardino, California - January 18, 2023
Building a Closet$1,656.58 - $1,813.30 for standard bedroom closet (4 ft reach-in)
Price considers the cost of closet building. Estimate includes framing walls and hanging drywall to add a closet to an existing room (4 ft wide). Does not include shelving systems, storage solutions, cabinets, lighting, or larger closets.
Reported by:
ProMatcher Research Team |
91710, Chino, California - January 18, 2023
Building a Closet$1,611.92 - $1,764.42 for standard bedroom closet (4 ft reach-in)
Price range takes into account closet building labor. Accounts for the price of framing walls and hanging drywall to add a closet to an existing room (4 ft wide). Excludes shelving systems, storage solutions, cabinets, lighting, or larger closets.
Reported by:
ProMatcher Research Team |
91729, Rancho Cucamonga, California - January 18, 2023
Building a Closet$1,833.76 - $2,007.24 for standard bedroom closet (4 ft reach-in)
Manhours for closet building are included in cost. Estimate includes framing walls and hanging drywall to add a closet to an existing room (4 ft wide). Items excluded: shelving systems, storage solutions, cabinets, lighting, or larger closets.
Reported by:
ProMatcher Research Team |
92201, Indio, California - January 18, 2023
Building a Closet$1,750.21 - $1,915.79 for standard bedroom closet (4 ft reach-in)
This ballpark estimate covers the cost of closet installation. There is no extra charge for framing walls and hanging drywall to add a closet to an existing room (4 ft wide). It will likely exclude [excludes 3].
Reported by:
ProMatcher Research Team |
92335, Fontana, California - January 18, 2023
Building a Closet$1,627.77 - $1,781.76 for standard bedroom closet (4 ft reach-in)
Cost includes labor. Includes demolition, framing, drywall, and finishing for reach-in closet (48" wide and 28" deep). Does not account for built-in shelving, custom organization systems, and walk-in closets.
Reported by:
ProMatcher Research Team |
92553, Moreno Valley, California - January 18, 2023
Building a Closet$1,649.37 - $1,805.41 for standard bedroom closet (4 ft reach-in)
This closet installation price considers the cost of labor. Also includes wall framing, drywall installation, and builder-grade finishes (rod, door, hinges, etc.). Cost estimate excludes built-in shelving, custom organization systems, and walk-in closets.
Reported by:
ProMatcher Research Team |
92262, Palm Springs, California - January 18, 2023
Building a Closet$1,754.53 - $1,920.52 for standard bedroom closet (4 ft reach-in)
Price takes into account the cost of closet installation. It also includes wall framing, drywall installation, and builder-grade finishes (rod, door, hinges, etc.). However, it excludes built-in shelving, custom organization systems, and walk-in closets.
Reported by:
ProMatcher Research Team |
92262, Palm Springs, California - November 14, 2022
Building a Sunroom$101.09 - $144.94 per square foot (three-season room)
Cost includes labor. Includes adding a three-season room to an existing structural base, installing standard-grade windows, siding, roofing and fixtures, and installing electrical access. Does not account for installing insulation, extending heating and/or cooling system, installing plumbing, and pulling permits.
Reported by:
ProMatcher Research Team |
91729, Rancho Cucamonga, California - November 14, 2022
Building a Sunroom$105.66 - $151.49 per square foot (three-season room)
Price includes manhours for sunroom installation. Also includes adding a three-season room to an existing structural base, installing standard-grade windows, siding, roofing and fixtures, and installing electrical access. Cost estimate excludes installing insulation, extending heating and/or cooling system, installing plumbing, and pulling permits.
Reported by:
ProMatcher Research Team |
92879, Corona, California - November 14, 2022
Building a Sunroom$105.83 - $151.73 per square foot (three-season room)
Estimate includes labor. Cost takes into account building a three-season sunroom onto an existing patio, deck, or slab foundation, standard materials (windows, siding, roofing, etc.), and basic electrical wiring. Excludes insulation, HVAC, plumbing work, and construction permits.
Reported by:
ProMatcher Research Team |
92878, Corona, California - November 14, 2022
Building a Sunroom$130.31 - $186.83 per square foot (three-season room)
Estimates for sunroom construction generally fall within this range. There should not be additional fees for adding a three-season room to an existing structural base, installing standard-grade windows, siding, roofing and fixtures, and installing electrical access. Additional charges will apply for insulation, HVAC, plumbing work, and construction permits.
Reported by:
ProMatcher Research Team |
92584, Menifee, California - November 14, 2022
Building a Sunroom$105.66 - $151.49 per square foot (three-season room)
Prices for sunroom construction may vary on a case-by-case-basis. This typically covers building a three-season sunroom onto an existing patio, deck, or slab foundation, standard materials (windows, siding, roofing, etc.), and basic electrical wiring. These items are considered extra: insulation, HVAC, plumbing work, and construction permits.
Reported by:
ProMatcher Research Team |
92201, Indio, California - November 14, 2022
Building a Sunroom$100.85 - $144.59 per square foot (three-season room)
The cost of sunroom construction normally falls in this range. This normally includes building a three-season sunroom onto an existing patio, deck, or slab foundation, standard materials (windows, siding, roofing, etc.), and basic electrical wiring. It is unlikley to include insulation, HVAC, plumbing work, and construction permits.
Reported by:
ProMatcher Research Team |
91710, Chino, California - November 14, 2022
Building a Sunroom$92.88 - $133.16 per square foot (three-season room)
Estimated quote considers the cost of sunroom installation. No additional charge for adding a three-season room to an existing structural base, installing standard-grade windows, siding, roofing and fixtures, and installing electrical access. Price does not take into account installing insulation, extending heating and/or cooling system, installing plumbing, and pulling permits.
Reported by:
ProMatcher Research Team |
92553, Moreno Valley, California - November 14, 2022
Building a Sunroom$95.04 - $136.26 per square foot (three-season room)
This estimate includes sunroom construction. Also includes building a three-season sunroom onto an existing patio, deck, or slab foundation, standard materials (windows, siding, roofing, etc.), and basic electrical wiring. There is an additional cost for insulation, HVAC, plumbing work, and construction permits.
Reported by:
ProMatcher Research Team |
92507, Riverside, California - November 14, 2022
Building a Sunroom$93.38 - $133.88 per square foot (three-season room)
Includes the price of sunroom installation. Cost accounts for adding a three-season room to an existing structural base, installing standard-grade windows, siding, roofing and fixtures, and installing electrical access. Does not include installing insulation, extending heating and/or cooling system, installing plumbing, and pulling permits.
Reported by:
ProMatcher Research Team |
92401, San Bernardino, California - November 14, 2022
Building a Sunroom$95.45 - $136.85 per square foot (three-season room)
Manhours for sunroom installation are included in price. Cost estimate includes adding a three-season room to an existing structural base, installing standard-grade windows, siding, roofing and fixtures, and installing electrical access. Does not include installing insulation, extending heating and/or cooling system, installing plumbing, and pulling permits.
Reported by:
ProMatcher Research Team |
92335, Fontana, California - November 14, 2022
Building a Sunroom$93.79 - $134.47 per square foot (three-season room)
The cost of sunroom construction is included in the estimate. Price takes into account standard three-season room addition with builder-grade materials (windows, siding, and roofing) and standard electrical work. Items excluded: insulation, HVAC, plumbing work, and construction permits.
Reported by:
ProMatcher Research Team |
92262, Palm Springs, California - December 10, 2021
Building a Home Addition$103.53 - $164.45 per square foot for standard grade construction
Cost estimate considers labor for building a home addition. Price estimate includes standard materials (windows, siding, roofing, electrical, fixtures), construction permits, and waste removal. Does not include construction drawings, premium finishes, and deep foundations.
Reported by:
ProMatcher Research Team |
91729, Rancho Cucamonga, California - December 10, 2021
Building a Home Addition$108.20 - $171.88 per square foot for standard grade construction
This building a home addition price quote presumes typical conditions. No additional charge for standard materials (windows, siding, roofing, electrical, fixtures), construction permits, and waste removal. Cost excludes construction drawings, premium finishes, and deep foundations.
Reported by:
ProMatcher Research Team |
92553, Moreno Valley, California - December 10, 2021
Building a Home Addition$97.33 - $154.60 per square foot for standard grade construction
This estimate includes home addition construction. Cost does include permits, builders grade materials, demolition, cleanup and disposal. There is an additional charge for high end finishes, deep foundations, and architectural plan preparation.
Reported by:
ProMatcher Research Team |
92335, Fontana, California - December 10, 2021
Building a Home Addition$96.05 - $152.57 per square foot for standard grade construction
Price includes labor. No additional charge for standard grade materials, demo, building permits, and construction cleanup. Cost estimate excludes high end finishes, deep foundations, and architectural plan preparation.
Reported by:
ProMatcher Research Team |
92879, Corona, California - December 10, 2021
Building a Home Addition$108.38 - $172.15 per square foot for standard grade construction
Estimated quote considers the cost of home addition construction. No additional charge for permits, builders grade materials, demolition, cleanup and disposal. Price does not take into account high end finishes, deep foundations, and architectural plan preparation.
Reported by:
ProMatcher Research Team |
92507, Riverside, California - December 10, 2021
Building a Home Addition$95.63 - $151.90 per square foot for standard grade construction
Estimate includes labor for building a home addition. Includes standard materials (windows, siding, roofing, electrical, fixtures), construction permits, and waste removal. Cost does not include construction drawings, premium finishes, and deep foundations.
Reported by:
ProMatcher Research Team |
92401, San Bernardino, California - December 10, 2021
Building a Home Addition$97.75 - $155.27 per square foot for standard grade construction
This estimated quote includes building a home addition. It also includes standard materials (windows, siding, roofing, electrical, fixtures), construction permits, and waste removal. Cost excludes construction drawings, premium finishes, and deep foundations.
Reported by:
ProMatcher Research Team |
92335, Fontana, California - May 16, 2021
Building a Garage Addition$39.55 - $50.85 per square foot (custom designed, standard grade)
Includes price of labor for building a garage addition. Includes standard materials and waste removal. Cost excludes design drawings.
Reported by:
ProMatcher Research Team |
92262, Palm Springs, California - May 16, 2021
Building a Garage Addition$42.63 - $54.81 per square foot (custom designed, standard grade)
Cost assumes a typical garage construction. Estimate accounts for standard materials and project cleanup. Price does not account for blueprint preparation.
Reported by:
ProMatcher Research Team |
92553, Moreno Valley, California - May 16, 2021
Building a Garage Addition$40.08 - $51.52 per square foot (custom designed, standard grade)
Estimate accounts for the price of building a garage addition labor. Cost includes standard grade materials and debris removal. Items that are not included: design drawings.
Reported by:
ProMatcher Research Team |
92879, Corona, California - May 16, 2021
Building a Garage Addition$44.63 - $57.38 per square foot (custom designed, standard grade)
Includes building a garage addition labor cost. There is no additional charge for standard grade materials and debris removal. Price does not take into account design drawings.
Reported by:
ProMatcher Research Team |
92401, San Bernardino, California - May 16, 2021
Building a Garage Addition$40.25 - $51.75 per square foot (custom designed, standard grade)
This estimate includes garage construction. Cost does include standard materials and project cleanup. The estimate excludes blueprint preparation.
Reported by:
ProMatcher Research Team |
91729, Rancho Cucamonga, California - May 16, 2021
Building a Garage Addition$44.55 - $57.28 per square foot (custom designed, standard grade)
Estimate includes labor. Cost takes into account standard materials and project cleanup. Excludes blueprint preparation.
Reported by:
ProMatcher Research Team |
92507, Riverside, California - May 16, 2021
Building a Garage Addition$39.38 - $50.63 per square foot (custom designed, standard grade)
Labor is included in this garage construction estimate. Price accounts for standard materials and project cleanup. Additional charge for blueprint preparation.
Reported by:
ProMatcher Research Team |
92262, Palm Springs, California - October 29, 2020
Dormer Addition$3,605.28 - $4,007.22 for single-window gable dormer
Price of window dormer installation is included in the estimate. Estimate also includes standard-grade materials and supplies to build gable dormer with one average-sized window. Does not include room-size additions, permits, interior finishes, hip roof dormers, shed dormers, home electrical wiring, or plumbing, .
Reported by:
ProMatcher Research Team |
92553, Moreno Valley, California - October 29, 2020
Dormer Addition$3,389.20 - $3,767.05 for single-window gable dormer
Includes the cost of window dormer installation. Price includes standard-grade materials and supplies to build gable dormer with one average-sized window. Estimate does not take into account room-size additions, permits, interior finishes, hip roof dormers, shed dormers, home electrical wiring, or plumbing, .
Reported by:
ProMatcher Research Team |
92335, Fontana, California - October 29, 2020
Dormer Addition$3,344.80 - $3,717.70 for single-window gable dormer
Labor is included in this dormer addition construction price quote. Includes framing, roofing, and finishing a gable dormer with a single window. Cost does not account for larger dormers, electrical work or plumbing services, permit inspection fees, dormers for hip roofs, and interior space renovations.
Reported by:
ProMatcher Research Team |
92879, Corona, California - October 29, 2020
Dormer Addition$3,774.00 - $4,194.75 for single-window gable dormer
Labor is included in this dormer addition construction cost. Does include framing, roofing, and finishing a gable dormer with a single window. Estimate does not include larger dormers, electrical work or plumbing services, permit inspection fees, dormers for hip roofs, and interior space renovations.
Reported by:
ProMatcher Research Team |
92401, San Bernardino, California - October 29, 2020
Dormer Addition$3,404.00 - $3,783.50 for single-window gable dormer
Cost includes labor. Includes framing, roofing, and finishing a gable dormer with a single window. Does not account for larger dormers, electrical work or plumbing services, permit inspection fees, dormers for hip roofs, and interior space renovations.
Reported by:
ProMatcher Research Team |
91729, Rancho Cucamonga, California - October 29, 2020
Dormer Addition$3,768.08 - $4,188.17 for single-window gable dormer
Estimated quote includes labor for window dormer installation. No additional charge for standard-grade materials and supplies to build gable dormer with one average-sized window. Cost estimate excludes room-size additions, permits, interior finishes, hip roof dormers, shed dormers, home electrical wiring, or plumbing, .
Reported by:
ProMatcher Research Team |
92507, Riverside, California - October 29, 2020
Dormer Addition$3,330.00 - $3,701.25 for single-window gable dormer
Cost estimate includes window dormer installation labor. Includes standard-grade materials and supplies to build gable dormer with one average-sized window. There is an additional charge for room-size additions, permits, interior finishes, hip roof dormers, shed dormers, home electrical wiring, or plumbing, .
Reported by:
ProMatcher Research Team |
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Ontario Home Addition Contractors
Galvan Construction & Development40 S Chestnut Pl Unit 5205, Long Beach, CA 503-707-0564
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AC Home RemodelSkycrest, Mission Viejo, CA 9493378707
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ECCO design build1240 E Ontario Ave, 102-219, Corona, CA 951-496-9511
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