J Allen Homes footer logo

Home Additions Services In Northern Colorado

More Space. More Possibilities.

A thoughtfully designed addition can give you the space you need without leaving the home and neighborhood you love. J Allen Construction creates custom home additions that complement your existing architecture, support your lifestyle and feel like they have always belonged.
Let's Talk About Your Project

Expand Your Home Around the Way You Live

Your needs can change, but that does not always mean your address has to. Whether you need a private primary suite, a larger gathering space, a dedicated home office or room for multiple generations, J Allen Construction can help you reimagine what is possible within your current home.

From initial planning through construction, we carefully consider how the addition will connect to your existing floor plan, architectural style and long-term goals.

Create a comfortable, private retreat with a spacious bedroom, thoughtfully designed bathroom, walk-in closet and personalized features.

Add room to cook, gather and entertain with an expanded kitchen, dining area, family room or open-concept living space.

Increase your home’s usable square footage with additional bedrooms, bathrooms, offices, bonus rooms or an entire second story.

Create additional parking, storage or flexible living space with a garage addition, guest suite, attached living quarters or accessory dwelling unit.

Design a space around your interests and lifestyle, including a home office, gym, sunroom, mudroom, theater room, covered patio or screened porch.

The outside of a house at sunset with large windows and a two story patio.

Designed to Belong

A successful addition should feel like a natural extension of your home. Our team carefully considers rooflines, exterior materials, interior finishes, traffic flow and architectural details to create a cohesive transition between the existing structure and your new space.

Our Home Addition Process

  1. Consultation & Planning

We begin by discussing your goals, priorities, property, budget and vision for the new space.

  1. Design & Selections

Plans are developed and refined as you choose the materials, finishes and features that will shape your addition.

  1. Construction

Our experienced team manages construction with careful coordination, quality craftsmanship and consistent communication.

  1. Final Walkthrough

We review the completed addition with you, address the final details and ensure the new space is ready to enjoy.

Why Choose J Allen Construction?

  • Local Northern Colorado experience
  • Personalized planning and guidance
  • Quality craftsmanship and materials
  • Clear, consistent communication
  • Licensed and insured professionals
  • Attention to architectural continuity

Family-owned since 1998, and the same trusted contractors for more than 20 years.

FAQs

Will my addition match my existing home?
That is always the goal. We carefully consider architectural details, exterior materials, interior finishes and floor-plan transitions so the new space feels cohesive with the original home.
Can we remain in our home during construction?
That depends on the scope of the addition and how it affects your existing living spaces. We will discuss what to expect and help you prepare before construction begins.
How long does a home addition take?
The timeline depends on the size, design, permitting requirements and complexity of the project. Once the scope is established, we will explain the anticipated schedule and keep you informed throughout construction.
Can renovations be completed with an addition?
Yes. An addition can often be coordinated with updates to an existing kitchen, living area, bathroom or adjoining space to create a more cohesive finished home.
Do home additions require permits?
Most additions require permits and inspections. Our team will help coordinate the applicable requirements and ensure the project follows local building codes.
Do you offer accommodation for students?
No, we do not offer accommodation, but we can recommend nearby hotels and rental properties.
J. Allen Construction recently did a remodel for us that included a front entry upgraded door, garage and rear entry doors, all with framing, staining and paint to match existing woodwork. From when we started working with Heather it was an excellently managed project with clear communication, documented deliverables, and a schedule that was implement on time. Once the actual work began Bill, Sean, and Steve were amazing – not only was their work professional and an example of true craftsmanship, at every stage of the project they communicated next steps and confirmed we were pleased with the results from start to finish. We are overwhelmingly pleased with how well J. Allen Construction completed the work – we have a remodel that will be beautiful complement to our home for years to come.
Kathleen

More Resources

Ready to Create More Room
for What Matters?

Tell us how your home needs to work differently, and let’s explore how a thoughtfully designed addition could bring new possibilities to the space you already love.
Schedule a Conversation
J Allen Homes footer logo
Quality custom homes, remodels, renovations, and maintenance.
Services
Custom Home Build Home Additions Home Renovations Home Maintenance
Company
About Portfolio Blog Reviews
About
FAQ Contact Privacy Policy Terms & Conditions
© 2026 J Allen Construction. All rights reserved.