Expand Your Home
Without Compromise
Seamless room additions that match your home's existing architecture, increase your living space, and boost your property value -- designed and built by experts.
Room Additions Designed to Feel Like They Were Always There
A well-designed room addition should feel like a natural extension of your home, not an afterthought. At L&M Custom Designs and Build, we engineer every addition to match your existing roofline, siding, trim, and architectural details so seamlessly that visitors never know where the original home ends and the new space begins.
Sonja Read's 30+ years of structural construction experience means your addition is built on a solid foundation -- literally. We handle everything from soil testing and foundation engineering to roof tie-ins and HVAC extensions, ensuring your new space meets the same quality standards as any new construction.
Whether you need a master suite, a home office, an expanded family room, or a second story, our design-build approach keeps the entire project under one roof. No miscommunication between architect and builder, no finger-pointing, and no surprises.
What Every Room Addition Includes
Architectural Design & Planning
Custom floor plans, elevations, and 3D renderings that show exactly how your addition integrates with your existing home.
Foundation Engineering
Proper soil analysis, engineered foundation design, and construction to ensure your addition is stable for decades.
Structural Integration
Roof tie-ins, load-bearing connections, and seamless framing that structurally unifies your new space with the existing home.
HVAC Extension
Properly sized ductwork extensions, additional zones, or dedicated mini-split systems to keep your new space comfortable.
Electrical & Plumbing
New circuits, outlets, lighting, and plumbing runs fully integrated with your existing systems and brought to current code.
Exterior Matching
Siding, roofing, trim, windows, and paint carefully matched to your existing home for a seamless appearance.
Interior Finishing
Drywall, trim, flooring, paint, and fixtures that match or complement your existing interior finishes.
Permit Management
All building permits, engineering approvals, setback requirements, and HOA compliance handled by our team.
Property Value Optimization
Strategic design choices that maximize both usable square footage and appraised value for the best return on investment.
Why L&M is the Right Choice for Room Additions
Structural Engineering Mastery
Three generations of building expertise means we understand load paths, foundation requirements, and structural connections at a deep level.
Seamless Architectural Matching
Our obsessive attention to rooflines, trim profiles, and material matching means your addition looks original.
No Surprises Underground
We survey utilities, test soil conditions, and verify setbacks before breaking ground. Problems are solved on paper, not in your yard.
Energy-Efficient Design
New additions built to current energy codes with modern insulation, windows, and HVAC means lower utility bills, not higher.
Future-Proof Planning
We design additions with future flexibility in mind -- wiring for future needs, plumbing access, and adaptable spaces.
Appraised Value Focus
We design to maximize your home's appraised value increase, often achieving 70-85% return on addition investments.
Ready to Transform Your Space?
Join over 200 satisfied homeowners. Book your free, no-obligation consultation today and get a detailed estimate within 48 hours.
No pressure. No obligations. Just expert advice from a 3rd-generation builder.
Our Proven Process
Site Evaluation
We assess your lot, existing structure, setback requirements, and soil conditions. We discuss your space needs and develop preliminary concepts.
Architecture & Engineering
Custom architectural plans, structural engineering, 3D visualization, and material selection. Full permit submittal and HOA approval.
Foundation & Construction
Foundation work, framing, roof integration, weatherproofing, systems installation, and interior/exterior finishing.
Completion & Inspection
Final inspections, walkthrough, systems testing, warranty documentation, and certificate of occupancy.
Frequently Asked Questions
How long does a room addition take to build?+
Most room additions take 3-5 months from permit approval to completion. A simple single-room addition can be 8-12 weeks. A second story or multi-room addition typically runs 4-6 months. We provide a detailed timeline after the design phase.
How much does a room addition cost per square foot?+
Room additions in the Austin area typically run $200-$350 per square foot for high-quality construction, depending on complexity, finish level, and whether plumbing is involved. Additions with bathrooms or kitchens are on the higher end.
Will an addition match my existing home's look?+
That is our specialty. We source matching or complementary materials, match trim profiles, and design rooflines that integrate seamlessly. Most clients say their guests cannot tell where the addition starts.
Do I need an architect for a room addition?+
Our design-build process includes all architectural design in-house. We create plans, handle engineering, and manage permits. You do not need to hire a separate architect.
What about my HOA?+
We handle HOA submissions including plans, material samples, and any required approval processes. We have experience working with HOAs throughout the Austin and Hill Country area.
Can I add a second story to my home?+
It depends on your existing foundation and structure. We assess this during our initial consultation and can tell you definitively whether a second story is feasible. If not, we explore ground-level alternatives.
Need More Space? Let's Talk.
Schedule your free room addition consultation. We will evaluate your property, discuss expansion options, and provide a detailed estimate within 48 hours.
Free estimates within 48 hours. No obligations. Serving Austin and the Texas Hill Country.