Learning Center

Every BuildX guide, podcast and video in one place.

LET'S TALK

Ask a question. Get the answer.

We search every article, podcast and video, including what was said inside them.

Try

Or browse everything

Every BuildX article, podcast and hand-picked video. Use the search above to reach the full video archive, including what is said inside each video.

Article Design Build

What Does a Two-Bedroom ADU Look Like?

A two-bedroom ADU can live like a full home. This 900 sq ft Plymouth, MA unit over a two-car garage has nine-foot ceilings and a full island kitchen.

Article Design Basics

Is 900 Square Feet Enough for an ADU?

Yes -- 900 sq ft is plenty when the design is smart. A BuildX unit fits two queen bedrooms, a full kitchen and bath, and still feels open.

Article Budget Basics

Is That $149,000 ADU You Saw Online Real?

No. A $149,000 ADU or shipping-container offer leaves out the single most expensive part of the job. Here's how to spot an incomplete price.

Article Build Energy Budget

What Does It Cost to Insulate an ADU?

ADU insulation costs range from $4,000 to $15,000 depending on whether you choose fiberglass batts, closed-cell spray foam, or a hybrid approach.

Article Build Site Legal

Can You Build an ADU on a Well?

Building an ADU on well water requires a flow test and setback compliance, plus the well must serve both homes without dropping pressure.

Article Build Rules

Can You Build a Full Basement Under Your ADU?

A full basement under your ADU adds storage, mechanical space, and long-term flexibility -- but check whether your town counts it toward gross floor area.

Article Budget

Why Do ADU Costs Jump from $250K to $400K?

ADU costs jump from $250K to $400K because of septic upgrades, site conditions, foundation choices, and design complexity -- not builder markup.

Article Budget Family Pros

What Are the Hidden Costs of Building an ADU?

The gap between a quoted ADU price and the final invoice comes from site work, septic, utility connections, and regulatory costs most builders leave out.

Article Budget Family

How Much Does It Cost to Build an ADU?

A turnkey ADU in Massachusetts costs $250K--$400K depending on site work, septic, foundation, and design -- here’s what drives every dollar.

Article Build Family Rental Retirement

Are Low-Cost Modular ADUs Misleading on Price?

Modular ADU companies advertise prices starting at $110,000, but hidden costs for site work, septic, and utilities can double the real price tag.

Article Rules Retirement

What Permitting Mistakes Delay ADU Projects?

After building dozens of ADUs across Massachusetts, we have seen the same costly mistakes happen repeatedly, and we know exactly what separates a smooth

Article Build Family Pros Retirement

What Problems Come With Cheap ADU Kits?

A homeowner calls us excited about an ADU because they found a modular builder advertising units “starting at $110,000.

Article Budget Family Retirement

HELOC for ADUs: How It Works and Who Qualifies

A HELOC lets Massachusetts homeowners finance an ADU using existing home equity. See how it works, who qualifies, and what rates to expect in 2026.

Article Budget Family Pros

What’s Included in BuildX’s ADU Price?

BuildX ADU pricing includes permits, foundation, modular unit, site work, utilities, and finishes. Here’s the full breakdown.

Article Design Family Retirement

Are BuildX ADUs Accessible? ADA Features Explained

The difference between a home that works for someone in their 70s and one that becomes a daily obstacle course comes down to decisions made during design and

Article Budget Family Rental

How Much Does a BuildX ADU Cost in 2026?

BuildX ADUs range from $284,301 to $525,861 across 14 floor plans, 610 to 900 SF. Site work is priced separately after a free lot review.

Article Build Family Pros

Which Heating System Is Best for Your ADU?

For most new ADUs, heat pumps are the top choice. They provide heating and cooling from one unit and cost less to run than gas. Pair with quality insulation

Article Rules Family Pros

Can You Rent Out An ADU?

Yes, you can rent your ADU in Massachusetts, but only as a long-term rental of 32+ days. Short-term rentals like Airbnb are prohibited under the new state law.

Article Basics Build Family Rental

What’s the Best Heating System for My ADU?

Heat pumps are the clear winner for Massachusetts ADUs -- 30 to 50 percent cheaper to operate, heating and cooling from one unit, and fully code-compliant. But

Article Basics Design Family Rental

How Do I Future-Proof My ADU for Solar & EV?

Future-proofing your ADU during construction saves $7,400 to $10,500 compared to retrofitting later. Solar conduit, EV charging pre-wire, and a 200-amp service

Article Rules Family Pros Rental

Do I Need a Separate Electric Meter?

Planning to rent your ADU someday? You need a separate meter now. Family-only use may allow a shared meter with a $500 sub-meter, but every town reads the code

Article Budget Family Pros Rental

HELOC: The Popular Choice (But Is It Right?)

HELOC or construction loan? Your equity decides. HELOCs cost under $1,000 to set up with interest-only payments during the build. Construction loans use future

Article Build Rules Family Pros

Can I Tie Into My Existing Septic?

Whether you can tie your ADU into your existing septic system depends entirely on when it was installed. Massachusetts Title V regulations treat pre-1995 and

Article Basics Design Family Retirement

How Do I Design a Roll-In Shower for My ADU?

Building a roll-in shower during ADU construction costs a fraction of retrofitting later; $800 for a curbless base now vs. $4,500 after the fact. BuildX

Article Basics Rules Family Rental

What’s the Maximum Size for an ADU?

Most Massachusetts homeowners can build a bigger ADU than they think. The state allows up to 900 square feet or 50% of your main home’s gross floor area; and

Article Design Family Rental

What Finishes Can I Choose for My ADU?

Your ADU finishes don’t have to be builder-grade. BuildX offers LVT in 60 colors, granite and quartz from 500+ slabs, plywood cabinets with soft-close, and

Article Basics Design Family Rental

What Furniture Works Best in ADUs?

Filling your ADU with regular-sized furniture is the fastest way to make it feel cramped. The fix isn’t downsizing; it’s right-sizing. BuildX and Setting the

Article Build Rules Family Pros

Why Plan 4-Foot Wide Stairways?

Building to code minimum means a 36-inch stairway that can’t fit a chair lift and a person side by side. BuildX designs every two-story ADU with 4-foot-wide

Article Budget Family Pros Retirement

Cape Cod Bank’s ADU Financing Program

Local Massachusetts banks like Cape Cod Bank offer ADU financing with HELOC rates at prime-minus vs. prime-plus at national lenders, up to 90% loan-to-value,

Article Budget Family Pros Retirement

How Do I Finance My ADU?

Should you use a HELOC, construction loan, or maybe you’re 62+ and considering a reverse mortgage? Today, two financing experts with over 60 years of combined

Article Build Rules Family Pros

What Are the Electrical Requirements for ADUs?

ADU electrical requirements go beyond outlets. Learn about 200-amp service sizing, 60-amp EV charger pre-wiring, solar-ready conduit, ERV/HRV ventilation

Article Build Rules Family Pros

How Do I Meet Net-Zero Energy Requirements?

Massachusetts ADUs must hit a HERS score of 55 or lower. Learn what net-zero actually requires; hybrid spray foam insulation, air sealing to 1.0 ACH50, solar

Article Build Family Pros

What Is Aeroseal and Do I Need It?

Aeroseal pressurizes your ADU and fogs it with water-based acrylic sealant that automatically finds and seals air gaps up to 5/8 inch. Costs $3,500-$5,000 for

Article Basics Budget Family Rental

What Kind of Insulation Do ADUs Need?

Massachusetts ADUs need spray foam walls plus blown-in attic insulation to hit HERS 55 or better. Open-cell spray foam in 2×6 walls gives R-20 with superior

Video Build Family

Dave Mulcahy shares his experience with BuildX

Join us as Dave Mulcahy shares his experience with BuildX, a standout team known for their exceptional communication, professionalism, and timeliness.

Video Build Family

60-Day Home Addition | Demo to Dream Home

Rusty from Bridgewater highlights the professionalism, efficiency, and excellent communication of the BuildX team, especially Buz and Kevin.

Video Basics Build Family Rental

First Ever ADU in Plymouth | A Life-Changing Build

We’re proud to share the testimonial from the homeowners of Plymouth’s very first Accessory Dwelling Unit (ADU). Thank you to our amazing customers for

Article Basics Design Family Rental

Can I Customize My ADU Layout?

Every BuildX ADU layout is fully customizable. Start with 2-4 design options, mix and match elements, then visualize in 3D and walk through a life-size floor

Article Basics Family Rental Retirement

What is an ADU?

An ADU is a self-contained housing unit on your property with sleeping, kitchen, and bathroom. Massachusetts law (effective Feb 2025) lets any single-family

Article Basics Design Family Retirement

What Is Universal Design for ADUs?

Universal design builds ADUs that work for all ages and abilities from day one. Adding 36-inch doors, zero-step entries, roll-in showers, and wall blocking

Article Budget Family Retirement

Reverse Mortgage Financing for ADUs

Homeowners 62+ can use reverse mortgages to finance ADU construction with no monthly payments and no income requirement. Approval is based on age, home value,

Article Build Rules Family Pros

How Do You Handle Septic Systems for ADUs?

Septic is the biggest cost wildcard in ADU construction: $15,000-$45,000 depending on groundwater, soil conditions, and system age. Pre-1995 systems are

Podcast Rules Family Retirement

ADU Insurance Coverage Gaps | BuildX Podcast

Jeff Sabel reveals insurance coverage gaps that cost ADU owners thousands. Learn code coverage, public adjusters, and claim strategies from BuildX Podcast.

Podcast Budget Family Retirement

Podcast -- Reverse Mortgages

Jane McCarthy explains how reverse mortgages can fund ADU construction. Learn HECM requirements, age limits, and funding strategies from Just Build Baby

Podcast Build Family Pros

Podcast -- Aeroseal Technology

Aeroseal technology seals hidden air leaks in your Massachusetts ADU, cutting energy costs 20-30%. BuildX Podcast explains how it works and what it costs.

Podcast Budget Family Pros Retirement

Podcast -- Mortgage Financing

Two financing experts break down every ADU loan option for Massachusetts homeowners, from HELOCs to construction loans, reverse mortgages, and more.

Podcast Build Rules Family Pros

Podcast -- Home Energy

BuildX Podcast covers Massachusetts energy code requirements for ADUs, including HERS scores, insulation specs, and what your builder must get right.

Podcast Build Rules Family Pros

Podcast -- Septic Systems

Title V rules, perc tests, and bedroom transfers explained. What every Massachusetts homeowner needs to know before adding an ADU on a septic system.

Still Have Questions?

Our team is here to help you navigate the ADU process from start to finish.

LET'S TALK
or call (781) 627-7000