Sun Spaces

What Sun Spaces does

Sun Spaces is a privately held Design/Build construction contractor founded in 1970 and headquartered in Redmond, Washington. The company designs and builds custom residential projects — primarily sunrooms, room additions, ADUs (Accessory Dwelling Units), and outdoor living spaces — for individual homeowners in the Greater Eastside of King County, including Bellevue, Kirkland, Sammamish, Issaquah, Mercer Island, Newcastle, Woodinville, and Bothell. Over 50 years of operation, Sun Spaces claims more than 6,000 completed projects, with technical capabilities including four-season sunroom construction engineered for the Washington climate, Big Glass Wall Systems (sliding/folding doors up to 40 feet wide and 14 feet tall), and architectural integration that matches existing home rooflines, materials, and trim details.

The company's core technology is its end-to-end Design/Build delivery model, which manages virtual assessment, custom design, permitting, and expert construction under a single contractor. Revenue is generated through one-time custom construction projects, with pricing determined per project based on size, design complexity, structural requirements, materials, and site conditions. The company uses a wholesale supplier purchasing model with a modest management fee, locking in material costs at the time of construction. Go-to-market is sales-led: prospective customers initiate contact through the company website or phone, receive a free virtual assessment, and then proceed through in-home consultation, custom design, and construction.

Sun Spaces employs 1-10 people and operates without any disclosed outside investors, parent company, or institutional capital. Customer acquisition is primarily through its website (sun-spaces.com), phone inquiries, and free virtual assessments, with no disclosed partnerships, certifications, or technology integrations. The company does not offer a mobile application, public API, or AI-powered tools. Its service area is strictly regional, with no disclosed plans for geographic expansion.

Name

Sun Spaces

Legal name

Sun Spaces

Website

https://sun-spaces.com

Company type

Private

Founded year

1970

Operating status

Operating

Headcount range

1–10 employees

Short description

Sun Spaces is a privately held Design/Build contractor in Redmond, Washington, founded in 1970, that designs and builds custom sunrooms, room additions, ADUs, and outdoor living spaces for homeowners across the Greater Eastside of King County.

Ownership category

akta.pro rank

Product category

Residential Design-Build Construction Services

SIC

Services-To Dwellings & Other Buildings (7340)

akta.pro primary industry

Sunrooms, Screen Rooms & Enclosures (HSAPALAF)

akta.pro secondary industries

Sunroom & Conservatory Additions (HSAPADAE), Family Room / Great Room Additions (HSAPADAJ), Porch & Veranda Construction (HSAPALAG), Pergolas, Gazebos & Shade Structures (HSAPALAD)

Keywords

• Custom sunroom construction
• Residential room additions
• Accessory dwelling units
• Design-build services
• Outdoor living spaces

Headquarters

HQ city

Redmond

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2C

Offering type

Services

Cost components

Supply Chain, Personnel, Operations, Marketing or Sales, Others

Revenue model

1. Custom Construction Projects: One-time custom construction projects for sunrooms, room additions, ADUs, and outdoor living spaces. Pricing varies based on size, design complexity, structural requirements, materials, site conditions, and project scope. Revenue is generated at project completion through the Design/Build model with costs determined at time of construction.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

Sun Spaces is a Design/Build construction company that designs and builds custom residential sunrooms, room additions, accessory dwelling units (ADUs), and outdoor living spaces for homeowners in the Greater Eastside of King County, Washington. Each project is custom-designed to integrate with the existing home's architecture, with pricing established through a free virtual assessment and construction handled end-to-end under one contractor.

Product overview

Sun Spaces is a Design/Build construction company serving the Greater Eastside of King County, Washington. The company offers a portfolio of core construction products: Custom Sunrooms (designed for year-round use with various styles including cathedral ceiling, glass-focused, and modern designs), Room Additions (fully integrated home expansions), ADUs (Accessory Dwelling Units for independent living), and Outdoor Living Spaces (covered patios and outdoor areas). The company also provides Design/Build Services as its project delivery method, managing the entire process from custom design through permitting and construction. Big Glass Wall Systems featuring large sliding/folding doors are offered as a specialized product component. Projects are custom-built for each home with architectural integration, energy-efficient materials, and full permitting.

Differentiator

Problem solved

Functional benefit

Products and services

• Custom Sunrooms Custom-designed sunrooms that bring natural light into the home and create comfortable living spaces for year-round use, including Cathedral Ceiling Sunrooms, Glass-Focused Sunrooms, Modern Sunroom Additions, and Indoor-Outdoor Living Spaces. Targeted at homeowners in the Greater Eastside of King County.
• Room Additions Custom-built home additions that expand living space and integrate with existing home architecture, improving functionality and flow. Targeted at homeowners needing additional conditioned living area in the Greater Eastside.
• ADUs (Accessory Dwelling Units) Flexible independent living spaces on the same property as a primary home, designed for multi-generational living, guest accommodations, rental opportunities, or future flexibility. Targeted at homeowners in the Greater Eastside.
• Outdoor Living Spaces Covered patios and outdoor spaces designed for comfort, function, and everyday use, including outdoor kitchens and seating areas. Targeted at Greater Eastside homeowners seeking enhanced outdoor living.
• Design/Build Services Comprehensive design and construction management services that handle the entire project from custom design through permitting and expert construction, with costs managed at the time of actual construction. Targeted at homeowners engaging the company for sunrooms, room additions, ADUs, and outdoor living projects.

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Champion Window: National home remodeling brand offering sunrooms, windows, siding, and roofing. Overlaps in sunroom installations but as part of a much broader portfolio rather than a specialized niche player.
• Pella Corporation: National window, door, and sunroom product company with Pella-branded sunroom/patio room installations. Comparable on the glass-heavy sunroom product line, though typically operates at larger project and price scale.
• Andersen Windows & Doors (Eagle Window & Door): Major window/door manufacturer whose products (including big glass wall and folding door systems) are commonly specified in custom sunroom and addition projects like Sun Spaces' — adjacent supplier/incumbent rather than direct installer competitor.

Direct peers

• Great Day Improvements: Multi-brand home improvement company operating sunroom (Sunrise), window, and bath franchises. Direct competitor in the residential sunroom and room addition category with a more franchise-driven, multi-product approach.
• Sunspace Sunrooms / Patio Enclosures: National sunroom and patio enclosure manufacturer/installer offering custom sunrooms, screen rooms, and patio covers — the most direct product-line competitor to Sun Spaces, though operating at national scale rather than regional.
• TEMO Sunrooms: Manufacturer and installer of custom sunrooms, patio rooms, and outdoor living structures with a dealer network across the U.S. Closely comparable product categories (year-round sunrooms, screen rooms) and similar custom-pricing model.
• Four Seasons Solar Products: Long-established custom sunroom, conservatory, and patio room manufacturer with a North American dealer network. Direct competitor in four-season sunroom construction with comparable energy-efficient, glass-heavy offerings.

Regional players

• Lindal Cedar Homes: Pacific Northwest-based custom cedar home and addition builder serving the Greater Seattle/Bellevue market. Comparable custom residential design-build model and regional focus, though focused on full homes/large additions rather than sunrooms specifically.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sun Spaces