Portland, ME's Trusted Sunroom Installer Since 1978
Sunroom Installation Built for Maine Living
Portland homeowners lose nearly five months of outdoor living every year to Maine’s unpredictable weather. A professionally installed sunroom changes that permanently, giving you a custom, year-round space that adds living area, curb appeal, and real home value.
46+
Years Installing in Maine
3
Sunroom Systems Available
$259/mo*
The Maine Weather Problem
Stop Losing Months
of Outdoor Living
100+
Frost days per year in Portland. That’s nearly five months when your outdoor space sits unused without a proper enclosure.
Maine gives you spectacular summers, and then takes them away. UV exposure during peak months can fade furniture, damage skin, and overheat any unprotected space. Coastal humidity and black flies make bare decks unusable for weeks at a time.
Enjoy outdoor living from early spring through late fall, and year-round with an insulated Model 400.
A custom sunroom installation solves all of it, permanently. Whether you want a bright three-season retreat or a fully insulated room you can use in January, there’s a Sunspace model designed specifically for that need.
Season Extension
Enjoy outdoor living from early spring through late fall, and year-round with an insulated Model 400.
UV Protection
ViewFlex® vinyl glazing and Low-E Argon glass block harmful UV rays without sacrificing natural light.
Insect-Free Comfort
Full fiberglass mesh screens keep mosquitoes and black flies out during peak bug season.
Weather Protection
Wind, coastal rain, and humidity are no longer a problem in a properly enclosed Sunspace structure.
Added Home Value
A custom sunroom increases your home's square footage, curb appeal, and resale value.
Three Sunroom Systems. One Expert Installer.
Choose Your Sunroom
Every model is custom-built to your home’s footprint, engineered for Maine’s climate, and installed by our crew, not a subcontractor. Select a model below to explore full specifications.
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3-Season WeatherMaster® System
Vinyl Sunroom — Maximum Airflow
Best for: Homeowners who want maximum ventilation, coastal-friendly durability, and a budget-smart seasonal upgrade.
The Model 200 is built around the WeatherMaster® 4-Track Vinyl Window System, the most versatile panel system Sunspace offers. Windows stack up, down, or bunch in the middle, delivering up to 75% open ventilation on warm afternoons. Built on 2-inch high-density foam panels and heavy-gauge aluminum, it handles coastal wind and rain while staying lightweight and low-maintenance.
- 75% ventilation: 4-Track windows in any configuration
- ViewFlex® Vinyl Glazing: 40+ years proven, safer than single-pane glass
- Full fiberglass mesh screens: Included standard; keeps Maine’s insects out
- 2″ high-density foam panels: Structural wall system with built-in insulation
- Manufacturer factory warranty: Industry-leading Sunspace guarantee
- Fits existing structures: Installs directly over your current deck or porch
Technical Specifications
Wall System
2" Foam + 2" Aluminum Extrusions
Frame Colors
White, Driftwood, Bronze, Black, Gray
Vinyl Tints
Clear, Smoke Gray, Dark Gray, Bronze
Roof Options
8 options incl. 4"/6" Insulated, Hybrid, SIP Panel, ThermaDeck
Season Use
Spring through Fall (3-Season)
3-Season Glass System
Glass Sunroom — Clean Contemporary Aesthetic
Best for: Homeowners who want the bright, open clarity of glass with a crisp, contemporary architectural profile.
The Model 300 delivers everything the Model 200 does, but replaces vinyl glazing with single-pane glass in a 2-inch extruded insulated aluminum frame. The result feels more like a permanent room addition: crisp views, a sharp profile, and an upscale finish that elevates your home’s exterior. Aluminum-framed double-roller windows slide open from either side with no fixed sash.
- Single-pane glass panels — Crystal-clear views vinyl cannot replicate
- Double-roller aluminum windows — Both sashes operate independently for full ventilation flexibility
- 2″ extruded insulated aluminum pillars — Commercial-grade strength, virtually maintenance-free
- High-density foam core walls — Aluminum-skinned on both sides; superior thermal resistance
- Heavy-duty aluminum gutters — Integrated drainage; no added trim work
- Multiple glass tint options — Manage glare and heat gain without darkening the interior
Technical Specifications
Wall System
2" Foam + 2" Aluminum Extrusions
Frame Colors
White, Driftwood, Bronze, Black, Gray
Roof Thickness
4" or 6" options; Cathedral or Studio pitch
Roof Options
8 options; works over existing decks, porches, carports
Season Use
Spring through Fall (3-Season)
4-Season Insulated System
Year-Round Sunroom — Cold Climate Engineered
Best for: Homeowners who want a true year-round room — comfortable in January, energy-efficient in July, and indistinguishable from the rest of the house.
The Model 400 is Sunspace’s premium insulated system, engineered specifically for cold-climate performance. 3-inch high-density foam walls and 3-inch heavy-gauge aluminum extrusions handle winter snow loads and high winds. Every extrusion includes commercial-grade thermal breaks — eliminating condensation and heat transfer, the two most common comfort complaints in lower-grade sunroom products.
- Low-E Argon gas glass: Superior thermal insulation; reduces UV transmission and noise
- Commercial-grade thermal breaks: Eliminates condensation on frames; minimizes winter heat loss
- 3″ heavy-gauge aluminum extrusions: Engineered for wind and snow load resistance
- Therma-Deck floor system: R-17, R-26, or R-35; compatible with carpet, tile, laminate, or hardwood
- Heating and cooling integration: Use as a dining room, home office, or living extension year-round
- No foundation work required: Installs over existing decks or porches with Therma-Deck flooring
Technical Specifications
Wall System
3" Foam + 3" Aluminum (vs. 2" on other models)
Frame Colors
White, Driftwood
Floor R-Value
R-17 / R-26 / R-35 (Therma-Deck system)
Roof Options
8 options incl. ThermaDeck for max insulation continuity
Season Use
Year-Round (4-Season)
Low-E Argon gas glass
Superior thermal insulation; reduces UV transmission and noise
Commercial-grade thermal breaks
Eliminates condensation on frames; minimizes winter heat loss
3" heavy-gauge aluminum extrusions
Engineered for wind and snow load resistance
Therma-Deck floor system
Enjoy outdoor living from early spring through late fall — and year-round with an insulated Model 400.
Heating & cooling integration
Use as a dining room, home office, or living extension year-round
No foundation work required
Installs over existing decks or porches with Therma-Deck flooring
Available Frame Colors
Available Glass Tints
Side-By-Side Comparison
Which Sunroom Is Right for You?
Use this table to match your budget, usage goals, and comfort requirements to the right Sunspace model.
| Feature | Model 200 | Model 300 | Model 400 |
|---|---|---|---|
| Season Use | 3-Season (Spring–Fall) | 3-Season (Spring–Fall) | 4-Season (Year-Round) |
| Glazing Type | ViewFlex® Vinyl | Single-Pane Glass | Low-E Argon Insulated Glass |
| Wall System | 2" Foam + 2" Aluminum | 2" Foam + 2" Aluminum | 3" Foam + 3" Aluminum |
| Ventilation | Up to 75% (4-Track) | Double-roller windows | Controlled (sealed for insulation) |
| Thermal Breaks | Standard | Standard | Commercial-Grade |
| Floor System | Deck/Porch compatible | Deck/Porch compatible | Therma-Deck (R-17 to R-35) |
| Frame Colors | 5 standard colors | 5 standard colors | White, Driftwood |
| Roof Options | 8 options | 8 options | 8 options incl. ThermaDeck |
| Screen Room Upgrade | ✔ Direct upgrade path | — | — |
| Best For | Airflow + Affordability | Clarity + Aesthetics | Year-Round + Energy Efficiency |
Not sure which model fits your home and budget? Our design consultants walk you through the right choice based on your existing structure, how you plan to use the space, and your goals for the climate.
Get a Room for as Low as $259/Month*
Flexible financing makes a custom sunroom installation accessible for most homeowners. Ask about current terms during your free consultation.
From First Call to First Coffee
Our Installation Process
Here is exactly what to expect when you work with Sunspace By Sunrise Sunrooms — from your first phone call to your first morning in your new room.
Free Consultation
We visit your property, assess your existing deck or porch, and discuss your vision, model preference, and budget.
Custom Design
Factory Build
Installation
Walkthrough
Our Work in Southern Maine
Installed Project Gallery
Sunrooms, enclosures, railings, and outdoor living products — all installed by our crew across Southern Maine.
Why Homeowners Choose Us
The Sunspace By Sunrise Difference
We are the local sunroom installation specialists Portland, ME homeowners have trusted for decades — not a national big-box brand, and not a general contractor doing sunrooms on the side.
1978
Serving Southern Maine
We have been building sunrooms longer than most of our competitors have been in business. Local expertise, local knowledge, local crews.
Auth.
Authorized Sunspace Dealer
We install the same modular system ranked among the best in the industry since 1991, with thousands of satisfied customers across North America.
100%
Custom-Designed
Every room is built to your specific dimensions, style, and use case — not an off-the-shelf kit dropped on your deck.
ME
Maine-Grade Materials
From UV-blocking vinyl to Low-E Argon glass to commercial thermal breaks, every component is selected for New England conditions.
$259
Financing Available
Rooms starting as low as $259/month* make custom sunroom installation accessible for most homeowners.
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Seamless Experience
From design consultation through final installation, one team manages your entire project — no handoffs, no surprises.
What Portland Homeowners Say
Real Results, Real Customers
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Common Questions
Sunroom Installation FAQs
Everything homeowners ask before scheduling their first consultation.
Cost depends on the model, size, roof system, and whether you're building over an existing structure. The Model 200 is the most accessible entry point, while the Model 400 represents a premium year-round investment. We offer financing starting at $259/month* and provide detailed quotes after a free on-site design consultation. Contact us to get accurate pricing for your specific project.
Yes — this is one of Sunspace's core design advantages. All three models (200, 300, and 400) can be installed directly over an existing deck or porch, and even under a previously constructed roof. This typically reduces installation time and cost significantly compared to building on a new foundation.
A 3-season sunroom (Model 200 or 300) is designed for spring through fall use and is not optimized for sub-freezing Maine winters without supplemental heat. A 4-season sunroom (Model 400) is fully insulated with thermal breaks, Low-E Argon glass, and thicker structural walls — built to stay comfortable year-round with standard heating and cooling.
Most sunroom projects are completed within a few weeks of design finalization, depending on model complexity and site conditions. Because Sunspace units are factory-manufactured to your exact specifications, on-site installation time is minimized.
Yes. We install sunrooms throughout Southern Maine and surrounding communities. Check our service areas page to confirm we cover your location, or call us directly and we'll let you know right away.
Absolutely. Many homeowners combine a sunroom installation with complementary outdoor improvements. A privacy wall can shield a sunroom entrance or patio-side exposure from neighbors or wind. If your project involves an adjacent uncovered patio area, a patio cover extends shade and weather protection to spaces outside the sunroom footprint — making your entire outdoor zone more usable.
Yes. If you're not ready for a full sunroom but want to enclose or weatherize an existing porch space, we also offer porch enclosures and porch and patio window installation as standalone services. These are great options when you want weather protection without a complete structural build-out. We also install louvered pergolas for homeowners who prefer an open-air shade solution over a full enclosure.
Your Next Step
Stop Losing Months to Maine's Weather
Homeowners who invest in a custom sunroom gain months of additional living space every year — protected from rain, wind, UV, and insects. The right sunroom starts with one conversation.