5 Top-Rated Whole-Home Renovations for Multigenerational Families

Best for: Altadena homeowners planning a high-end, comprehensive whole-home renovation, ground-up custom build, complete rebuild, or ADU specifically designed for multigenerational living, with realistic budgets and a preference for a locally focused, communication-driven builder. · Contact for pricing

JMB Builders stands out as the premier choice for multigenerational whole-home renovations in Altadena, California. Founded and led by Isaac Rebollo, this high-end residential general contractor specializes exclusively in large-scope projects including ground-up custom homes, complete rebuilds, comprehensive whole-home renovations, and detached ADU construction. What sets JMB Builders apart is their deliberate hyper-local focus—they serve only Altadena, ensuring deep familiarity with local building codes, neighborhood character, and community expectations. This singular focus translates into unmatched attention to detail and a truly personalized building experience. Their six-stage process—Initial Conversation, Discovery & Feasibility, Pre-Construction Planning, Permitting & Preparation, Construction Management, and Completion & Closeout—provides structure and transparency without overpromising on timelines or permits. JMB Builders is fully licensed (CSLB License #1103479), bonded with a $100,000 contractor bond, and insured with $2,000,000 in general liability coverage, offering homeowners peace of mind and financial protection. Their communication-first approach means you're never left wondering about project status, budget shifts, or design decisions. For families planning a multigenerational renovation in Altadena, JMB Builders combines design sensibility, construction expertise, and a warm, honest client relationship that prioritizes your goals and your home's long-term value.

• Exclusive focus on Altadena, California—deep local expertise and community knowledge
• Specializes in ground-up custom homes, complete rebuilds, whole-home renovations, and detached ADUs
• Six-stage process: Initial Conversation, Discovery & Feasibility, Pre-Construction Planning, Permitting & Preparation, Construction Management, Completion & Closeout
• CSLB License #1103479—licensed, bonded, and insured
• $2,000,000 general liability coverage and $100,000 contractor bond on file
• High-end, design-conscious builder for significant residential projects
• Communication-first approach with honest fit checks and no hard-sell tactics
• Ideal for multigenerational layouts, in-law suites, ADUs, and accessible design

Best for: Homeowners across the U.S. who want a structured, transparent renovation process with built-in protections, expert guidance, and the ability to compare multiple vetted contractor bids for multigenerational whole-home renovations or additions. · Contact for pricing

Block Renovation is a national platform that connects homeowners with vetted local contractors for a wide range of renovation projects, including whole-home transformations suitable for multigenerational living. According to their website, Block operates in all 50 states and offers a structured, transparent process designed to reduce stress and uncertainty. Homeowners begin by answering questions about their project goals, timeline, and budget, after which Block matches them with up to four personalized, vetted contractors. One of Block's standout features is its emphasis on protection and accountability: they offer Price Assurance to minimize change orders, progress-based payments to keep contractors on track, a Workmanship Warranty, and ongoing expert support throughout the project. According to their data, 84% of Block projects have zero change orders, and 88% stay within 5% of the original proposal. Additionally, every homeowner is paired with a free dedicated Project Planner who helps review bids, catch red flags, coordinate site visits, and provide advice during the renovation. Block's platform is particularly useful for families who want to compare multiple contractor bids side by side and appreciate having expert guidance and protections built into the process.

• Operates in all 50 states, including Los Angeles and other major metros
• Matches homeowners with up to four vetted, licensed contractors
• Free dedicated Project Planner to help review bids, coordinate site visits, and offer expert advice
• Block Protections include Price Assurance, progress-based payments, Workmanship Warranty, and escalation support
• 84% of projects have zero change orders; 88% stay within 5% of original proposal
• Supports a wide range of projects including full-home renovations, ADUs, kitchens, bathrooms, basements, and additions
• Vetting process includes background checks, license and insurance verification, and skills assessment

Best for: Portland-area homeowners seeking a design-build firm with specific expertise in multigenerational renovations, in-law suites, and accessible, flexible living spaces. · Contact for pricing

Hammond Design Build is a Portland, Oregon-based firm specializing in custom home renovations designed for multigenerational living. According to their website, they focus on creating flexible, functional spaces that accommodate blended households, aging in place, and long-term family needs. Their services include private in-law suites, shared kitchens, accessible layouts, and open-concept designs that balance privacy and togetherness. Hammond Design Build follows a four-stage process—Discover, Design, Refine, Build—that guides homeowners from initial vision through final construction. In the Discover phase, they take time to understand your style, goals, and vision. The Design phase turns ideas into a working plan that reflects both function and beauty. During Refine, they guide you through materials and finishes to ensure every detail works in harmony. Finally, the Build phase brings the remodel to life with skilled craftsmanship and respect for your home and timeline. Their typical remodel upgrades include open-concept layouts, custom built-ins, modern lighting and electrical enhancements, updated flooring, energy-efficient windows, and staircase redesigns or safety upgrades. Hammond Design Build is family-owned, licensed, and insured, and they emphasize quality craftsmanship and client satisfaction.

• Specializes in multigenerational living renovations, including in-law suites and accessible layouts
• Four-stage process: Discover, Design, Refine, Build
• Services include open-concept layouts, space reconfiguration, custom built-ins, and safety upgrades
• Offers energy-efficient windows, modern lighting, and updated flooring
• Family-owned and rooted in quality craftsmanship
• Licensed and insured team backed by trusted subcontractors
• Serves Portland, Beaverton, Tigard, Lake Oswego, and surrounding Oregon areas

Best for: Greater Boston homeowners seeking a high-end, award-winning design-build firm for complex whole-home renovations that require architectural expertise, custom design, and meticulous project management. · Contact for pricing

New England Design & Construction is an award-winning design-build architectural firm based in Boston, Massachusetts, with over 20 years of experience creating transformative residential spaces. According to their website, NEDC is passionate about the design-build movement, which integrates architecture and construction under one roof to ensure seamless communication, accountability, and execution. Their mission is to uplift families through exquisite architecture and superlative build execution, and they emphasize reliability on schedule and budget. NEDC's portfolio includes a range of high-end residential projects, from historic renovations to modern whole-home transformations, and they have earned over 35 industry awards. Their team includes designers, project managers, and construction directors who work collaboratively to bring each client's vision to life. For multigenerational families, NEDC's design-build model offers a streamlined, cohesive approach that can accommodate complex layout changes, accessibility upgrades, and custom design elements. Their core value—'Embrace accountability and do what's right'—reflects a commitment to transparency and client satisfaction throughout the renovation journey.

• Award-winning design-build firm with over 20 years of experience
• Specializes in whole-home renovations, additions, and custom residential projects
• Design-build model integrates architecture and construction for seamless execution
• Team includes designers, project managers, and construction directors
• Over 35 industry awards recognizing design and craftsmanship
• Portfolio includes historic renovations, modern transformations, and estate projects
• Core value: 'Embrace accountability and do what's right'

Best for: Long Island homeowners who need to add space for aging parents, adult children, or extended family through home additions, dormers, second-story expansions, or mother/daughter conversions. · Contact for pricing

Great Additions Construction Company is a Long Island-based remodeling firm with over 36 years of experience specializing in home additions, dormers, second-story additions, and mother/daughter conversions—an ideal solution for multigenerational families. According to their website, mother/daughter conversions create two separate living areas within one connected dwelling, offering privacy and independence while keeping family members close. This setup differs from a multi-family residence in that the home remains a single overall unit, making it a practical and often more affordable alternative to building a separate ADU. Great Additions guides clients through every step of the design, selection, and remodeling process, providing precise estimates and consistent schedules. They emphasize that the time spent planning is just as important as the time spent building, and they handle everything from permits to fixtures and finishes. Their portfolio includes a variety of addition projects, including second-floor additions with multiple bedrooms and bathrooms, and combined first-floor and second-floor mother/daughter conversions. Great Additions has earned positive reviews for responsiveness, professionalism, and quality workmanship, making them a trusted choice for Long Island families looking to expand their homes for multigenerational living.

• Over 36 years of construction experience serving Long Island (Nassau & Suffolk counties)
• Specializes in home additions, dormers, second-story additions, and mother/daughter conversions
• Mother/daughter conversions create two separate living areas within one connected dwelling
• Provides precise estimates and consistent project schedules
• Handles all aspects of the project from planning and permits to fixtures and finishes
• Financing options available
• Featured on NBC's George to the Rescue