InstaBidsHow much will a sunroom cost?
Johnston County, sunroom definition: “Sunroom: a one-story structure attached to a dwelling with a glazing area in excess of 40 percent of the gross area of the structure’s exterior walls and roof.”
Source: Johnston County, North Carolina, Building Inspections, read 6 November 2026.
Hillsborough County, site drawing: “Provide a site plan drawn to scale.”
Source: Hillsborough County, Florida, Development Services, read 6 November 2026.
Context: all "Added porch, deck, patio, or terrace" jobs
The survey figure below covers all "Added porch, deck, patio, or terrace" jobs, not sunroom addition alone.
$6,000 was the median homeowner survey figure for data years 2021-2023 in the United States. For all jobs in the AHS category “Added porch, deck, patio, or terrace”, the survey records a typical range (middle half of 594 American Housing Survey data points, the United States, 2021-2023) of $3,000 to $15,000.
Updated 2026-11-06
InstaBids is an AI-run marketplace for homeowners and property managers: describe a home job once, by chat or through your own AI assistant, add photos, and get multiple written quotes on the same scope, compared apples to apples, with no phone calls or home visits before you pick.
For homeowners, property managers, landlords and HOA boards.
| What was measured | Median | Typical range (middle half) |
|---|---|---|
| For all jobs in the AHS category “Added porch, deck, patio, or terrace”, the survey records | a median of $6,000 | the typical range (middle half of 594 American Housing Survey data points, the United States, 2021-2023) was $3,000 to $15,000 |
How measured: hired-out finished jobs, survey-weighted, not adjusted for inflation. Source: U.S. Census Bureau, American Housing Survey 2023, data read 6 November 2026.
These figures are estimates from U.S. Census Bureau, American Housing Survey 2023, data years 2021-2023, read 6 November 2026, for the United States. They are not a quote, and they are not a promise of what any contractor on InstaBids will charge. Your price depends on your home, the materials and the contractor. Get written bids before you decide.
- Describe it onceBy chat, or through your own AI assistant, and add photos.
- Post it and send itContractors bid in writing on that scope.
- Compare line by lineEvery quote is written against the same scope.
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At a glance
- 40 percentJohnston County sunroom glazing thresholdJohnston County, North Carolina, Building Inspections, read November 6, 2026
- permanent masonry foundationJohnston County new-addition foundationJohnston County, North Carolina, Building Inspections, read November 6, 2026
- separate heating/cooling systemJohnston County sunroom heating optionJohnston County, North Carolina, Building Inspections, read November 6, 2026
For your AI assistant
MCP connector · REST API · plain HTMLHand any of these to your assistant and it can help you write this job's request; you send the request yourself. What you type in the job box above goes into the prompt these buttons carry. The connector asks you to sign in to your InstaBids account the first time.
- MCP connector URL
https://instabids.ai/api/agent/mcp - Agent API (OpenAPI)
https://instabids.ai/openapi.json - Start-request link
https://instabids.ai/intake?from=cost-sunroom-screened-porch-three-season-room&utm_source=us&utm_medium=page&utm_campaign=cost&page_type=cost&job=sunroom+screened+porch+three+season+room - Prompt for any AI, with your job
- ChatGPTOpens with the prompt
- ClaudeOpens with the prompt
- GrokOpens with the prompt
- GeminiCopies the prompt, then opens
Every page is plain HTML. Steps for every assistant: add to your assistant.
What sunroom addition includes
Where a quote below names a city or county, it is that office's own rule, shown as one example; the permit office for your home may set different rules.
| What the source says | Where it comes from |
|---|---|
| Johnston County, new construction: “New construction additions must be constructed on a permanent masonry foundation as per NCRC and comply with trade provisions pursuant to Certificate of Occupancy.” | Johnston County, North Carolina, Building Inspections, read 6 November 2026. |
| Johnston County, pre-manufactured sunrooms: “Engineered pre-manufactured sunroom plans shall include information regarding Energy Code compliance. Construction supported by piers only shall provide provisions for insulation and duct protection. If protection is achieved by closing the crawl space area, ventilation details shall be provided.” | Johnston County, North Carolina, Building Inspections, read 6 November 2026. |
On InstaBids, describe whether the sunroom is new construction or a manufactured enclosure so contractors address the same structure.
Line items a written bid should list
- Johnston County, heating and cooling: “Sunroom additions shall maintain thermal isolation; and shall be served by a separate heating/cooling system, OR be thermostatically controlled as a separate zone of the existing system provided the existing system is capable of carrying the extra square footage.”
Source: Johnston County, North Carolina, Building Inspections, read 6 November 2026.
- Hillsborough County, setback dimensions: “Provide the front, side, and rear yard setbacks (dimensions) from the proposed structure to the property boundary lines.”
Source: Hillsborough County, Florida, Development Services, read 6 November 2026.
On InstaBids, include the sunroom heating arrangement and setback dimensions in the scope contractors receive.
How to compare written bids like for like
Ask every contractor to bid in writing on the same line items listed above, then compare the written bids line by line.
Hillsborough County, site constraints: “The site plan must also identify all easements, conservation, and/or wetlands areas and setbacks.”
Source: Hillsborough County, Florida, Development Services, read 6 November 2026.
On InstaBids, describe easements and other site constraints once for contractors to address in their written bids.
Who pulls the permit for sunroom addition?
Hillsborough County, Florida, Development Services, sunroom addition homeowner permit applicant: “Permits for Homeowners acting as their own contractor must complete an Owner Builder Disclosure Statement”
Source: Hillsborough County, Florida, Development Services, read 6 November 2026.
On InstaBids, include responsibility for the sunroom permit paperwork in the scope you share with contractors.
What inspections does sunroom addition need?
Tampa, typical enclosure inspections: “The following is a list of typical Residential Enclosure Inspections needed: Pre-Construction Inspection BLB-On Grade Slab BLD-Final Above Inspections list is provide as a guide. Additional inspections may be required, depending on the project scope of work. Consult with your Building Inspector.”
Source: City of Tampa, Florida, Construction Services, read 6 November 2026.
On InstaBids, include enclosure inspections in the written scope before choosing who gets your number.
Get written bids
Contractors who take part bid on one written scope card, so nobody visits before you see any prices.
Sources for the figures on this page
- U.S. Census Bureau, American Housing Survey 2023, https://www.census.gov/programs-surveys/ahs/data/2023/ahs-2023-public-use-file--puf-.html, read 6 November 2026. U.S. government work; no endorsement implied.
- Johnston County, North Carolina, Building Inspections, www.johnstonnc.gov/insp/content.cfm, read 6 November 2026.
- Hillsborough County, Florida, Development Services, hcfl.gov/businesses/hillsgovhub/residential-and-mobile-home-checklists/residential-screen-enclosure-and-glass-room-additions, read 6 November 2026.
- City of Tampa, Florida, Construction Services, www.tampa.gov/construction-services/residential-permits/enclosures/inspections, read 6 November 2026.