Delaware Custom Home Builder, Renovations & Additions Since 1979

R.M. Williams Co., Inc. is Delaware's premier custom home builder, serving New Castle and Kent Counties for over 45 years. We have completed more than 610 new builds and take pride in crafting homes that reflect each homeowner's vision — from the ground up or through expert renovations and additions. Whether you're looking for a fully custom new construction home, a stunning home addition, or a complete renovation, R.M. Williams delivers uncompromising craftsmanship on every project.

Our team specializes in custom home builds, spec homes, land purchases, room additions, second-story additions, kitchen renovations, bathroom remodeling, basement finishing, garage additions, sunroom additions, and whole-home renovations throughout Delaware. We serve Wilmington, Newark, Bear, Middletown, Hockessin, Greenville, Pike Creek, Elkton, Dover, and all surrounding communities in New Castle County and Kent County.

Custom Home Builds, Additions & Renovations in Delaware

From new construction custom homes to whole-home renovations and room additions, R.M. Williams handles every phase of residential construction across Delaware. We are a licensed and insured Delaware general contractor with over four decades of experience in residential building, home improvement, and construction management.

• Custom Home Construction Delaware — Fully custom new builds and new construction homes designed around your vision and budget in New Castle and Kent Counties. We handle every detail from architectural design and land selection through framing, roofing, siding, drywall, flooring, cabinetry, and finish work.
• Spec Homes & Active Builds Delaware — New construction spec homes available in sought-after Delaware communities. Tour our active builds and secure your home before completion.
• Land Purchase & Site Development Delaware — We help clients identify and purchase lots, navigate zoning and permitting requirements, and prepare sites for new home construction throughout New Castle and Kent Counties.
• Home Additions Delaware — Master suite additions, primary bedroom additions, sunroom additions, second-story additions, family room additions, in-law suites, mudroom additions, and garage additions that seamlessly expand your living space.
• Home Renovations Delaware — Kitchen renovations, kitchen remodeling, bathroom renovations, bathroom remodeling, master bath renovations, basement finishing, basement remodeling, whole-home renovations, and interior remodeling done right.
• Garage Construction Delaware — Attached and detached garage builds, garage conversions, and oversized garage additions built to match your home's architecture.
• Deck & Outdoor Living Delaware — Custom decks, composite decks, screened porches, and outdoor living spaces designed for Delaware's four-season climate.

Why Delaware Homeowners Choose R.M. Williams

For over 45 years, homeowners across Delaware have trusted R.M. Williams Co., Inc. for custom home builds, home additions, and renovations. Here's what sets us apart:

• Experience — Over 610 custom homes built since 1979. Hundreds of successful additions and renovations completed across New Castle and Kent Counties.
• Transparency — Detailed written estimates, clear contracts, and no surprise change orders. You always know where your project stands.
• Quality Craftsmanship — We use quality materials and proven subcontractors. Every project is built to last and built to code.
• Local Knowledge — Deep familiarity with Delaware building codes, permitting processes, and local zoning in Wilmington, Newark, Bear, Middletown, and throughout New Castle and Kent Counties.
• Full-Service — From initial design consultation and land selection through construction, final inspection, and punch-list completion, we manage every phase of your project.

New Custom Home Construction in Delaware

Building a new custom home in Delaware is one of the most significant investments you'll ever make. At R.M. Williams, we make the process straightforward and rewarding. We work with you from the first design conversation through lot selection, architectural planning, permitting, construction, and final walkthrough.

Our custom home builds in Delaware include traditional colonial homes, craftsman-style homes, farmhouse designs, contemporary homes, ranch homes, and two-story custom homes. We build on your lot or help you find the right land in New Castle County or Kent County, Delaware.

Typical custom home features we deliver include open floor plans, gourmet kitchens with quartz countertops and custom cabinetry, primary suites with spa bathrooms, finished basements, three-car garages, covered porches, composite decks, smart home wiring, energy-efficient insulation, and high-efficiency HVAC systems.

Home Additions in Delaware — Expand Without Moving

A well-designed home addition can add significant square footage, value, and comfort to your existing Delaware home — without the cost and disruption of moving. R.M. Williams specializes in seamlessly integrating additions with your existing home's structure, roofline, and exterior finish so the addition looks like it was always part of the original design.

Popular home addition types we build in Delaware include: primary bedroom and bathroom additions, in-law suite additions, great room additions, kitchen expansions, sunroom and four-season room additions, second-story additions over a garage or existing footprint, mudroom additions, and detached garage additions with bonus rooms above.

Home Renovations & Remodeling in Delaware

From a single-room kitchen renovation to a whole-home remodel, R.M. Williams brings the same level of quality and professionalism to every renovation project in Delaware. Our renovation services include kitchen remodeling, bathroom remodeling, basement finishing, living room renovations, dining room updates, laundry room renovations, home office conversions, and full interior gut-renovations.

We serve homeowners throughout Wilmington, Newark, Bear, Hockessin, Pike Creek, Greenville, Middletown, Smyrna, Dover, and all surrounding towns in New Castle County and Kent County, Delaware.

Land Purchase & New Construction Lots in Delaware

Finding the right lot is the first step in building your custom home. R.M. Williams has deep connections in the Delaware real estate market and can help you identify available land in New Castle County and Kent County. We evaluate lots for buildability, soil conditions, perc testing for septic systems, utility access, and zoning compliance before you commit to a purchase.

Once your lot is secured, our team manages all site preparation work including clearing, grading, erosion control, foundation excavation, and utility connections — getting your land ready for construction as quickly and efficiently as possible.

About R.M. Williams Co., Inc. — Delaware's Trusted Builder Since 1979

Founded in 1979 and incorporated in Delaware, R.M. Williams Co., Inc. has grown into one of the state's most trusted names in residential construction. With over 610 new homes built and hundreds of successful renovations and additions completed, our team brings decades of hands-on expertise to every project.

We are a Delaware-incorporated general contractor specializing in custom residential construction, home additions, home renovations, and spec home development across New Castle and Kent Counties. Our commitment to quality craftsmanship, transparent pricing, and personal service has earned us a reputation as one of Delaware's premier home builders.

We serve homeowners throughout Wilmington, Newark, Dover, Bear, Middletown, Hockessin, Greenville, Pike Creek, Claymont, New Castle, Smyrna, and all surrounding communities of New Castle and Kent Counties, Delaware.

Our Build Process — From Concept to Completion

Whether you're planning a new custom home build, a home addition, or a full renovation in Delaware, R.M. Williams follows a proven, transparent process that keeps you informed and on schedule every step of the way.

1. Initial Consultation — We meet to understand your vision, goals, timeline, and budget. No pressure, no commitment — just an honest conversation about what's possible.
2. Design & Planning — We work with architects and designers to develop plans that match your vision and meet Delaware building code requirements.
3. Detailed Estimate — You receive a comprehensive written estimate with line-item pricing so you know exactly what you're getting and what it costs.
4. Permitting — We handle all Delaware building permits, inspections, and approvals in New Castle County or Kent County on your behalf.
5. Construction — Our experienced crew and vetted subcontractors build your project to the highest standards of quality and craftsmanship.
6. Final Walkthrough — We walk the completed project with you, address any punch-list items, and ensure you're completely satisfied before we consider the job done.

Frequently Asked Questions — Delaware Custom Home Builder

How long does it take to build a custom home in Delaware?

A typical custom home in Delaware takes 9–14 months from permit approval to final walkthrough, depending on size, complexity, and current permit processing times in New Castle or Kent County.

Do you help with land selection and purchase in Delaware?

Yes. R.M. Williams can help you identify available lots in New Castle and Kent Counties, evaluate buildability, and coordinate with real estate agents to facilitate land purchase before construction begins.

What areas of Delaware do you serve?

We serve all of New Castle County and Kent County, Delaware — including Wilmington, Newark, Bear, Middletown, Hockessin, Greenville, Pike Creek, Claymont, New Castle, Smyrna, Dover, and surrounding communities.

Do you build home additions and renovations in addition to new homes?

Absolutely. Home additions and renovations are a major part of our business. We build room additions, second-story additions, primary suite additions, garage additions, kitchen renovations, bathroom remodels, basement finishing, and whole-home renovations throughout Delaware.

Are you licensed and insured in Delaware?

Yes. R.M. Williams Co., Inc. is a licensed general contractor in Delaware and carries full general liability insurance and workers' compensation coverage on every project.

Contact R.M. Williams — Delaware Custom Home Builder

Ready to start your custom home, addition, or renovation project in Delaware? Request a free estimate or call us today to schedule your initial consultation.