Home Additions and Basement Finishing in
Sussex County, DE

Add the space your family needs with custom home additions and basement renovations designed to fit your home and your lifestyle.

Seamless Additions.
Lasting Value.

At Straume Contracting, we help Delaware homeowners expand their existing living space through thoughtfully designed additions and basement renovations. Whether you need more room for a growing family, a dedicated workspace, or a finished basement for entertaining, we create spaces that feel like a natural extension of your home.

New bedroom in Milton with built in shelves and closet.

Create More Space for the Way You Live

  • Add valuable square footage with custom home additions designed to blend seamlessly with your existing home. From family rooms and primary suites to expanded kitchens and sunrooms, we'll help you create the space you need without sacrificing character or functionality.

  • Transform an unfinished basement into comfortable, usable living space. Whether you're envisioning a family room, guest suite, home office, gym, or entertainment area, we can help bring your basement to life.

  • Create a comfortable and private space for extended family members with a custom in-law suite. We build in-law suites that are comfortable and functional, giving everyone the room they need.

  • Whether you need a playroom, media room, or just some extra space, we can create flexible rooms that adapt to your family's changing needs.

  • A screened porch adds real living space to your home, and here in coastal Delaware, it's one of the best ways to enjoy the outdoors. We build screened porches that are sturdy, functional, and built to hold up to the coastal climate.

  • We construct detached garages and sheds that are solid, functional, and finished to complement or match your property.

Why Locals Choose Us

Local Sussex County, Delaware homeowners trust us because we show up, follow through, and stand behind our work.

Work With Us

01 | Clear Communication

We keep you informed throughout the entire project — what's happening, what's next, and how any changes will affect the timeline or scope. No guessing, no runaround.

02 | Honest Recommendations

Additions and basement projects require a lot of decision-making. We'll give you straight advice based on real experience, not just whatever's easiest for us to build.

03 | Local Experience

We’ve lived and worked in Sussex County for years, and understand what is required of Coastal Delaware homes. From navigating building codes to employing the best tradesmen, we leverage our local experience to produce the very best project for you.

Explore Some of Our Additions and Basement Remodels Across Sussex County

  • Exterior of a converted garage with new dark siding, original brick accents, and new natural wood trim, under a partly cloudy sky, with a concrete sidewalk in front and a fenced backyard to the side.

    Garage Conversion / In-Law Suite

  • An empty room with gray walls, a white built-in cabinet with shelves, a closed white closet door, and a blue wainscoting on one wall. There is a table covered with a light-colored cloth in the foreground.

    One Room Split Into Two / Nursery

  • Basement under construction

    Basement rough-in

What Our Clients Have to Say

  • Richard Hughes | New Patio

    “Straume Contracting did a wonderful job on our new back porch. The porch was exactly as it was drawn out and completed shortly after promised. The price for the work done was about what I would expect.”

  • Christina Slot

    “Keith was wonderful. Will definitely hire him for future jobs. He was honest, with great communication, and got the job done quickly. Highly recommend!”

  • Cliff Grunstra | Crawl Space, Gutters, Garage Door

    “Keith is amazing, literally. This guy got us new 6" gutters with leaf guard and downspouts/popups, a brand new garage door and motor, and an encapsulated and conditioned crawl space for less then just the crawl space would have cost if we went with one of the other guys. Work was high quality and completed in record time over the holidays. HIGHLY RECOMMENDED!”

  • Mary Moran | Basement Repair

    “I had leaks in two places in my basement almost from the day I took possession of my home from the builder. Numerous attempts to repair the problem failed. When Straume Construction examined the problem, a more thorough repair job was planned that would get to the basis of the problem. Keith the owner was a very knowledgeable professional and kept in close supervision with his workers who were very able and hard working. They started the job on time and completed it without delay. Very importantly, the cost was reasonable. I highly recommend Straume Construction.”

  • Luke Metaxas | New Fencing

    “We hired Straume contracting to help install a fence in our backyard. They offered a fair price and completed the fence on schedule. We love our fence and had a great experience working with Keith on this project. Highly recommend!”

How to Work With Us

Homeowners shouldn’t have to chase down contractors for updates or wonder if the job will actually get finished. We communicate clearly and often, and always make sure you’re in the loop.

01

Reach out

Fill out our form or email us to share about your project and goals.

02

Site Visit

We'll come out, walk the space with you, and talk through your options.

03

Build it out

We’ll get to work and be in touch through every step of the process.

04

Final Check

We walk through the finished space together and make sure every detail is exactly as planned.

Ready to Start Your Project?

Just tell us a bit about it below and we’ll get in touch to schedule an estimate.