A logo for j allen construction company with mountains in the background

Fort Collins Home Additions Contractors

Serving Berthoud, Johnstown, Fort Collins, Loveland, Windsor, or surrounding Northern Colorado areas

Established in 1998 - Fully Licensed and Insured - Detail-Oriented

Expand Your Home With Home Addition Construction

When your house feels a little bit small, you may not have to move. If you love your current property, you can get the space you need with a home addition. It sounds like an ambitious project, but you'll get the results you need with help from the experienced team at J. Allen Construction Company.


We've helped countless customers with all sorts of home-building projects, and we specialize in custom finishes that make your home dreams come true. When it comes to additions, we'll work with you to understand your needs, and we'll plan the addition so it fits seamlessly into your home's current footprint.


Plus, you can tell us what you want the space to do. We'll work out the custom finish that you need to make the space really work for your family. Our team will be there for you throughout the entire process.


Let's talk about how a home addition can change your life. Get an estimate when you fill out the easy online form today.



Types of Home Additions We Offer


We understand that every family has unique needs, and our goal is to make your home a perfect fit for your lifestyle. Here are some of the types of home additions we offer to help you expand your space and enhance your home in Fort Collins:


  • Master Suite Additions: Imagine having your own peaceful retreat within your home—a master suite where you can escape the hustle and bustle of everyday life. Whether you want to expand your existing master bedroom or add an entirely new suite, we can create a private oasis complete with luxurious touches like walk-in closets and spa-inspired bathrooms. It’s all about making sure you have a comfortable and private space to recharge.
  • Kitchen Expansions: Kitchens are the heart of the home, and if yours is feeling cramped, it might be time for an expansion. By opening up your kitchen, you create more room for cooking, hosting, and gathering with family and friends. Picture a spacious kitchen island perfect for meal prep or entertaining guests, along with added storage to keep everything organized. Our kitchen expansions are designed to blend seamlessly with your existing home while making the space more functional and enjoyable.
  • Living Room Expansions: Need more space for family movie nights or hosting game-day parties? A living room expansion can open up your home and provide a welcoming space for everyone to gather. Whether it’s tearing down walls to create an open floor plan or adding square footage to make your living area feel more spacious, we’ll make sure your expanded living room is perfect for relaxation and entertaining.
  • Garage Conversions: Garages aren’t just for cars—they’re an opportunity to add valuable living space to your home. We can help you transform your garage into a cozy guest suite, a productive home office, or even a fun game room for the kids. If you’re looking to add an Accessory Dwelling Unit (ADU) for rental income or extended family, garage conversions are a versatile option that can add both space and value to your property.
  • Specialty Rooms: Sometimes, your dream addition isn’t about expanding an existing room—it’s about creating a unique space that fits your lifestyle. We offer specialty room additions like theater rooms for movie enthusiasts, home gyms for staying fit, or sunrooms that let you enjoy Fort Collins’ beautiful natural light year-round. Whether you want a cozy reading nook for winter or a shaded retreat for summer, we tailor every specialty room to fit your vision and make your home truly yours.


Choose Licensed and Insured Contractors

Never take chances with your home. It's vital to choose a contractor you trust. When you choose J. Allen Construction Company, you'll get an experienced, detail-oriented team that is fully committed to meeting your needs.


Not only are we licensed and insured, but we're a local, family-owned business. This means we have the skills to build to perfection and the dedication to focus on your preferences. You'll get to work with our owner on every job, and we've used the same team of trustworthy contractors for over 20 years.


Since 1998, J. Allen Construction Company has been the go-to team for custom home building in Berthoud, Johnstown, Fort Collins, Loveland, Windsor, or surrounding Northern Colorado and Southern Wyoming areas. Tell us how we can serve you today. We like making dreams come true!

Professional Screening and Background Checks


At J. Allen Construction Company, we take the reliability and professionalism of our team very seriously. Our screening processes include thorough background checks, which cover everything from a national criminal database search to reviewing any state business filings. 

We also conduct criminal records searches, including checking for felony arrests, misdemeanors, and other offenses, to ensure that our clients are in safe hands. In addition to background checks, we verify local and state licensing to make sure each contractor is properly certified.

We pride ourselves on the professionalism and trustworthiness of our team, as reflected in both homeowners ratings and online ratings. Our commitment to comprehensive screening ensures that you can trust the people working on your home, giving you peace of mind throughout your renovation project. to ensure reliability and professionalism.


Contact Us

The Home Addition Process

  • Initial Consultation: When we first meet, it’s all about you and your vision for your home. We’ll sit down to discuss your goals, needs, and budget in detail. This is your chance to share everything you’ve been dreaming of, whether it’s a second-story addition, a new living space concept, or expanding for a growing family. We take the time to really understand what you want, so we can tailor our approach to fit your lifestyle perfectly.
  • Design Phase: Once we understand your vision, we move into the design phase. Our team will conduct site evaluations and begin creating sketches and floor plans. We use 3D renderings to bring your ideas to life, giving you a visual representation of how the project will look and function before construction begins. You’ll even have the opportunity to visit our design showroom, where you can explore bathroom remodel options, luxury fixtures, and various kitchen additions to refine the details of your project.
  • Planning and Permits: Proper planning is key to a successful home addition. We handle all the permits and ensure that every aspect of the project meets local building codes. From selecting eco-friendly building materials to complying with all necessary regulations, our experience in Fort Collins means we know how to navigate the permitting process smoothly, so you don’t have to worry about the paperwork.
  • Construction Phase: This is where the magic happens. Our skilled craftsmen get to work, following a clear renovation schedule to make sure everything stays on track. We use high-quality materials that are well-suited for Colorado’s climate—whether it’s picking the best exterior door styles or custom window opening designs to optimize energy efficiency and aesthetics. Throughout the construction process, we provide regular updates so you’ll always know what’s happening and when to expect the next milestone.
  • Post-Completion: After the addition is complete, we don’t just pack up and leave. We’ll do a final walkthrough with you to make sure every detail is just right. We also offer maintenance follow-ups—typically at 6 months and 1 year—so you can rest easy knowing your new space is built to last. If you have any questions about how to maintain new features like built-in cabinets or if you'd like further assistance, we're always here to help.

Why Choose Us For Your Home Addition?

  • Local Expertise: We know Fort Collins inside and out—from the architecture styles to the local climate. Our deep knowledge of the area means we create additions that are not only beautiful but also well-suited for Colorado’s semi-arid conditions. We design with energy efficiency in mind, ensuring your home stays comfortable year-round.
  • Personalized Services: Every project is unique because every family is unique. We take pride in offering personalized solutions, from initial design to the finishing touches, making sure each addition matches your vision and integrates seamlessly with your existing home and neighborhood.
  • High-Quality Craftsmanship: Our team consists of experienced professionals who use top-quality materials to ensure durability and beauty. We know how Colorado’s weather can be tough on homes, and we build with that in mind, using techniques that stand the test of time.
  • Transparent Communication: We believe in keeping you informed. From our digital project portal to regular on-site updates, you’ll always know what’s happening with your project. Transparency is key to a smooth process, and we work hard to make sure you’re never left wondering about the next step.


Do You Need More Space?

Fill out the online form to discuss home additions with a licensed and insured team.

Contact Us

FAQ

  • How long does a typical home addition take?: A typical home addition takes anywhere from 3 to 6 months, depending on the size and complexity of the project. We ensure that every phase, from design to construction, runs smoothly to meet our agreed timeline while maintaining quality.

  • What are the costs involved in a home addition?: Costs vary based on the type of addition, materials used, and the scope of work. We provide transparent, detailed estimates upfront so there are no surprises along the way.

  • Will my addition match my home’s current style?: Absolutely! We take great care to match the new addition to your home’s current style, including architectural details, exterior finishes, and interior design elements, to create a seamless integration.

  • Why invest in a home addition?: Adding space to your home not only enhances your day-to-day comfort but also significantly boosts your property’s value. Given the growing need for versatile living spaces in Fort Collins, a well-planned addition can be a smart long-term investment.

  • Do I need a building permit for my home addition?: Yes, a building permit is required for most home additions. Our design team will take care of securing all necessary permits, ensuring that the project complies with local building codes and regulations, so you don’t have to worry about the paperwork.

  • What are the alternative living arrangements during construction?: Depending on the size of the project, you may need to consider alternative living arrangements for a portion of the construction period. For more extensive additions like second-story additions, temporary relocation may be more comfortable, and we can help you plan accordingly.

  • How do you ensure energy efficiency in my home addition?: We incorporate energy efficiency into every project, using high-quality insulation, energy-efficient windows, and effective HVAC systems to minimize your energy usage. Features like glass doors can also maximize natural light, reducing the need for artificial lighting during the day.

  • Can you include built-in cabinets or other custom features?: Absolutely. Our design team can work with you to add built-in cabinets, custom shelving, or other unique features to your home addition. We want your new space to reflect your personal style and provide practical storage solutions that meet your needs.

  • Can you handle living space remodels and kitchen remodels as part of my home addition?: Yes, we often combine living space remodels and kitchen remodels with home additions to create a more cohesive and functional home layout. Whether you need to expand your kitchen or add more living space, we tailor each project to your overall vision.

  • What kind of return on investment can I expect from a home addition?: A well-executed home addition often offers a strong return on investment, especially when it enhances essential areas like kitchens, bathrooms, or adds square footage like a second-story addition. In Fort Collins, functional home upgrades are particularly appealing to future buyers.

Do You Need More Space?

Fill out the online form to discuss home additions with a licensed and insured team

Share by: