Custom Sunroom Cost Guide

How Much Does a Custom Sunroom Cost in Colorado?

A stage-by-stage price breakdown

Quick answer: Based on Custom Sunroom LLC's completed Denver Metro projects, a fully custom, ground-up sunroom addition typically costs $90,000 to $120,000, covering design, foundation, framing and roofing, windows and doors, exterior finish, utilities, insulation, and interior finish carpentry.

Here is what a custom sunroom costs in the Denver Metro area, broken down by construction stage, so you know where the money goes before you ever request a quote.

Written by the Custom Sunroom LLC team·Based on Denver Metro project pricing·Updated September 22, 2026

Get Your Free Estimate View Financing Options
Finished custom sunroom addition with gable roof and stone foundation in Lakewood, Colorado
Eight Stages of Custom Sunroom Construction Foundation, framing, roof, glass, finish, utilities, insulation, and interior detail each carry their own cost.
Completed Colorado ProjectsCompleted Colorado sunrooms and patio projects
Licensed & InsuredFull foundation, framing, and permit work
2-Year Workmanship WarrantyBuilt for Colorado homes and weather
Financing AvailableOptions for qualified homeowners

Ask five contractors what a sunroom costs and you can get five different numbers, because they are not always pricing the same project.

A prefabricated sunroom kit has a different construction scope from a ground-up custom addition with a poured foundation, structural framing and glazing designed for Colorado conditions.

This guide explains typical Denver Metro costs for each stage of a ground-up custom sunroom addition.

Soil, slope, roofline and site access affect the final price. The ranges below are planning figures; a free in-home estimate provides pricing for the specific property.

Custom Sunroom Costs by Construction Stage

A ground-up sunroom addition moves through eight stages, and each one shows up as its own line in the budget. Here is roughly what each stage runs in the Denver Metro area.

Quick total: across Custom Sunroom LLC's completed projects, a fully custom sunroom addition typically lands between $90,000 and $120,000 from design through final cleaning. A dedicated mini-split heating and cooling system, when added, usually runs another $10,000 on top of that.
1. Design & Concept Complimentary, then ~$5,000

Initial design and concept planning are complimentary. After the design direction is agreed, the next stage includes an agreement, professional drawings and city coordination.

2. Site Prep & Foundation $25,000 – $30,000

Once the permit is issued, crews prepare the site and pour the foundation. There are a few foundation types depending on soil and slope, but this stage is almost always the single biggest line in the budget.

3. Framing & Roofing $20,000 – $25,000

The room gets framed, and the roof goes on as quickly as possible after that, using shingle, flat EPDM, steel, or tile, so an open structure is not left exposed to Colorado rain and snow.

4. Windows & Doors $10,000 – $15,000

A wide range of windows and doors can go into a custom sunroom, but this figure reflects an average replacement-grade window and door package, including standard fixed skylights.

5. Exterior Finish ~$5,000

Once the windows and doors are in, the exterior gets finished. Regular lap siding or board-and-batten is the most common choice, including soffit and fascia to tie into the existing roofline.

6. Electrical & Mechanical $8,000 – $12,000

With the room enclosed, we move to internal utilities: electrical in most cases, mechanical work, and occasionally plumbing. Many homeowners add a dedicated mini-split heating and cooling unit here, which typically runs about $10,000 on its own.

7. Insulation & Drywall $8,000 – $10,000

Once utilities pass inspection, insulation and drywall go in. Most of our sunrooms are built with vaulted ceilings, which often requires spray foam insulation.

8. Paint, Trim & Flooring $8,000 – $15,000

Interior and exterior painting, finish carpentry, and finish flooring bring the room to move-in condition. Final cleaning completes the preparation for use.

Design Options

Sunroom Styles and How They Affect the Budget

Design Options for Your Home The style you choose changes the framing and roofing stage the most, since that is where the extra structure lives.

Shed Roof Sunroom Typically the simplest build

Clean and practical when the existing roofline or footprint calls for a simpler connection. A single-slope roof usually keeps framing and roofing costs toward the lower end of the range.

Gable Sunroom Mid-to-upper range

A taller ceiling and stronger architectural presence. Good for larger additions tied to main living areas, though the vaulted ceiling often requires spray foam insulation.

Elevated Sunroom Upper end of the range

Built for walk-out basements, raised decks, or sloped lots where the foundation is not simple. The added structural work at the foundation stage is usually what pushes these projects higher.

Not sure which style fits your home? A site visit is the fastest way to know. We can look at the existing roofline, grade, and access, and tell you which style keeps the project closest to budget.

What Pushes a Sunroom Budget Higher

  • A larger room, which scales the foundation, framing, and roof together.
  • Elevated or walk-out conditions that complicate the foundation type.
  • Upgraded glass packages beyond standard replacement-grade windows.
  • A dedicated mini-split heating and cooling system for true four-season use.
  • Premium flooring, ceiling detail, or finish carpentry beyond a standard package.

What Keeps a Sunroom Budget Lower

  • A shed roof design instead of a gable or elevated structure.
  • A simple, level foundation with no walk-out or elevation to work around.
  • Standard replacement-grade windows and doors instead of a premium package.
  • A standard finish package for flooring, ceiling, and carpentry.
Compare the specifications included in each quote. Review foundation design, framing, glazing, insulation and finish allowances alongside the total price.
Completed Projects

Completed Projects within This Construction Scope

These are completed Custom Sunroom LLC projects that match the stages above: foundation and framing work, glass, and a finished interior.

Custom sunroom addition exterior showing foundation, framing, and gable roof in Lakewood, Colorado
A full ground-up sunroom addition: foundation, framing, roof, and glass. View case study
Custom sunroom and kitchen update exterior in Boulder, Colorado
Windows, siding, and exterior finish stage completed. View case study
Elevated custom sunroom built around an existing deck in Centennial, Colorado
An elevated sunroom built around an existing deck condition. View case study
Related Cases

Two Projects That Show the Cost in Practice

One is a ground-up custom sunroom with a full kitchen connection. The other is an elevated sunroom built around an existing deck condition.

Finished custom sunroom with large windows, vaulted wood ceiling, and connected living space Custom Sunroom

Custom Sunroom and Kitchen Update

A ground-up addition that moved through every stage in this guide, from foundation to finish flooring, and connected directly into the kitchen.

View Project Case Study
View Full Gallery

Financing a Custom Sunroom

If the number you are working toward is $90,000 or $120,000, financing can make the properly built version of the project reachable instead of forcing a compromise on foundation, glass, or finish quality.

Financing is available through HFS Financial for qualified homeowners, with a soft credit check to review rates before committing to anything.

View Financing Options

How to Compare Construction Quotes

Compare foundation specifications, glazing, insulation, permit work and included finishes when reviewing quotes. Different construction scopes can produce different prices.

Foundation design, glazing and insulation affect structural performance and comfort. Review these specifications before approving the construction scope.

Qualified homeowners can review financing options alongside the proposed construction scope and budget.

Summary

A custom sunroom is a construction project with defined stages, and the price reflects that: foundation, framing, roofing, glass, utilities, insulation, and finish work all show up in the total, as shown in the stage-by-stage breakdown.

Custom Sunroom LLC's $90,000 to $120,000 Denver Metro range gives you a way to judge any quote you receive, including ours.

Custom Sunroom LLC designs and builds custom sunrooms for Denver Metro homeowners, with permit coordination and design suited to Colorado weather.

Schedule a free in-home estimate to see exactly what your project would cost, or check financing options first if budget is the main question right now.

FAQ

FAQ: Custom Sunroom Cost

Quick answers for homeowners planning a custom sunroom budget, what's included, and financing.

How much does a custom sunroom cost in Colorado?

Based on Custom Sunroom LLC’s completed Denver Metro projects, a fully custom, ground-up sunroom addition typically costs $90,000 to $120,000 from design through final finishes. The range depends on foundation type, room size, glass and window package, and whether dedicated heating and cooling is added.

Does a custom sunroom need its own foundation?

Yes. A custom sunroom is built from the ground up, which means a new foundation, new framing, and a new roof. That is why foundation work is usually the single biggest line item in the budget.

What is included in a custom sunroom price?

A full sunroom price typically includes design and stamped drawings, permitting, foundation, framing and roofing, windows and doors, exterior finish, electrical and mechanical work, insulation and drywall, and interior and exterior finish carpentry and flooring.

Does the price include permits?

Yes. Professional drawings and city permitting are part of the process for a properly built sunroom, and the cost of that work is included in the range in this guide.

Can I finance a custom sunroom?

Yes. Financing is available through HFS Financial for qualified homeowners and can be used for a custom sunroom addition.

What increases a sunroom's price the most?

Foundation work is usually the single biggest line item, followed by framing and roofing. Larger rooms, elevated or walk-out conditions, premium glass packages, and dedicated heating and cooling all add to the total.

What is the difference between a gable, shed roof, and elevated sunroom?

A shed roof sunroom uses a single-slope roof and is usually the simplest build. A gable sunroom has a taller, vaulted ceiling and a stronger architectural presence. An elevated sunroom is built for walk-out basements, raised decks, or sloped lots, which adds foundation work and usually costs more.

Are these prices exact quotes?

No. These are typical planning ranges for the Denver Metro area based on standard project stages. Every home is different, so the only way to get an exact number is a free in-home estimate.

Free In-Home Consultation

Get a Project-Specific Estimate

Tell us what you are considering. Custom Sunroom LLC can review your home, walk through the stages in this guide, and give you a clear price for a custom sunroom addition.

  • Custom sunrooms and four-season room planning
  • Patio enclosures, screened rooms, and Colorado rooms
  • Financing information available through HFS financing

Start with a Free Estimate

By submitting this form, you agree that Custom Sunroom LLC may contact you about your project request. Your information is handled according to our Privacy Policy and Terms of Use.