Are There Mortgage Applications in Massachusetts to Finance an ADU?

Massachusetts householders now have a statewide Accent Dwelling Unit (ADU) financing choice by way of MassHousing, providing income-eligible debtors a fixed-rate second mortgage to assist finance ADU development.

For residence consumers, there may be now a named Massachusetts mortgage program which will assist finance an ADU after buy, as soon as they personal and occupy the house, have permits and plans in hand, and are able to construct.

The mortgage program introduced by the Healey-Driscoll administration is a crucial change as a result of financing has lengthy been a significant barrier to ADU development. Many owners serious about constructing an ADU face two main issues: native laws and restricted lending choices. The brand new MassHousing program doesn’t take away each impediment, but it surely offers Massachusetts householders and future consumers a extra concrete reply to a query that was as soon as more durable to reply.

What’s an ADU?

An adjunct dwelling unit, also known as an ADU, is a smaller residential dwelling area on the identical lot as a main residence. Up to now, these items have been known as in-law residences, “granny flats,” and different names. An ADU might be created inside the present home, hooked up to it as an addition, or constructed as a indifferent construction elsewhere on the property. That flexibility is one purpose ADUs have drawn extra consideration from householders, homebuyers, and policymakers in search of methods so as to add smaller housing choices with out constructing a wholly separate principal residence.

Massachusetts additionally made ADUs extra related by altering state legislation. A key a part of a 2024 housing legislation permits ADUs by proper in single-family-zoned neighborhoods statewide, although municipalities’ guidelines nonetheless matter. MassHousing’s ADU supplies equally describe the Inexpensive Properties Act as a significant step that eliminated a big impediment to ADU development statewide.

Beneath the 2024 legislation, which took impact in February 2025, householders can add ADUs of as much as 900 sq. toes—or half the dimensions of their main residence, whichever is smaller—with out particular permits. Owners can create ADUs as basement or attic residences, residence additions, or indifferent items. Occupants don’t should be associated to the property proprietor, and house owners are usually not required to reside on the property. 

To qualify for the MassHousing ADU mortgage, debtors should personal and occupy the single-family residence as their main residence.

What mortgage program is offered in Massachusetts for an ADU?

The Healey-Driscoll administration introduced on March 17, 2026, MassHousing’s Accent Dwelling Unit Mortgage Program, offering reasonably priced financing to assist eligible householders add a further unit to their property. In line with MassHousing, the mortgage can be utilized for brand spanking new ADU development both throughout the envelope of an current residence or elsewhere on the lot.

The mortgage is structured as a fixed-rate second mortgage. MassHousing says indifferent ADUs might qualify for as much as $250,000 in financing, whereas hooked up ADUs might qualify for as much as $150,000. The company additionally says the financing combines an interest-bearing mortgage amortized over 20 years with further funding supplied at 0 % curiosity and deferred reimbursement phrases. This system is designed to broaden borrowing energy with out overburdening householders with debt.

Within the press launch asserting the brand new mortgage program, MassHousing mentioned certified householders would obtain the ADU mortgage at a 5.25 % rate of interest.

MassHousing Vice President of Homeownership Applications Mounzer Aylouche mentioned the product is meant to serve moderate-income Massachusetts households by providing a decrease rate of interest and better mixed loan-to-value limits than are usually obtainable by way of a house fairness line of credit score. MassHousing CEO Chrystal Kornegay mentioned the objective is to make ADU development extra accessible to householders throughout the state, together with these in search of area for intergenerational dwelling or rental revenue.

What ought to residence consumers know in the event that they wish to construct an ADU later?

That is the place the main points matter. MassHousing says the ADU program is strictly construction-to-permanent financing. It’s meant for householders who have already got designs, permits, and different pre-development supplies in hand and are prepared to maneuver ahead with development. This system web page additionally says eligible debtors should personal a single-family residence that they occupy as their main residence.

For residence consumers, the sensible takeaway is easy: this isn’t a broad purchase-stage ADU mortgage for somebody who remains to be deciding whether or not a property may work. Based mostly on MassHousing’s printed standards, a purchaser planning so as to add an ADU would typically want to shut on the house first, occupy it as a main residence, work by way of native design and allowing necessities, after which apply as soon as the venture is prepared for development. That’s an inference from this system’s eligibility guidelines and construction-ready requirement.

MassHousing additionally says potential debtors might be able to use Massachusetts Housing Partnership technical help funding for predevelopment work, together with design and allowing, earlier than making use of for ADU development financing. That could be particularly related for residence consumers and householders who like the thought of an ADU however know they may need assistance getting from idea to a construction-ready venture.

Are there eligibility and revenue limits for a MassHousing ADU mortgage?

MassHousing says eligible candidates should meet statutory revenue limits of as much as 135 % of the world median revenue (AMI) and fulfill different underwriting standards. In its announcement, the company gave examples of these AMI limits, together with as much as $205,335 in jap Massachusetts, $165,345 in Worcester County, and $129,870 in Hampden County.

MassHousing’s client web page additionally says revenue pointers range by location and that further eligibility necessities apply.

Do cities and cities have their very own ADU guidelines?

Even with statewide legalization and a brand new financing choice, residence consumers shouldn’t assume each property is ADU-ready. Whereas the brand new legislation overrides current native zoning bylaws and ordinances, streamlining the method for householders, municipalities should impose affordable laws, comparable to setback necessities and restrictions on construction top.

For instance, consumers contemplating properties with current or potential ADUs ought to overview native short-term rental laws, as municipalities retain the authority to ban or regulate using ADUs for short-term stays.

An ADU inside one-half mile of a commuter rail, subway, ferry, or bus station is not going to require a parking area. This provision could possibly be an element for residence consumers evaluating properties close to public transportation. Municipalities can not require multiple (1) parking area for an ADU situated outdoors 0.5 miles of a commuter rail station, subway station, ferry terminal, or bus station.

Various guidelines make due diligence particularly essential for residence consumers who both wish to buy a house with an current ADU or add one after closing. It’s essential to notice that an ADU is a everlasting a part of the property and can’t be bought individually from the first home. As with the primary residence, the ADU should additionally adjust to relevant well being and security necessities, and a few native bylaws and ordinances nonetheless apply.

Backside line

Massachusetts now has a statewide ADU mortgage program by way of MassHousing, which is significant information for each present householders and homebuyers considering forward. However this system is greatest understood as a post-purchase development financing choice for eligible owner-occupants who’re able to construct, not as an early-stage mortgage for a homebuyer nonetheless exploring choices.

For residence consumers contemplating a house for its ADU potential, the higher method is to guage the property, native guidelines, allowing course of, and financing choices earlier than assuming the venture will work.

FAQ: Massachusetts ADU financing

Is there a mortgage program in Massachusetts to finance an ADU?

Sure. MassHousing has a statewide Accent Dwelling Unit Mortgage Program for income-eligible householders. It offers reasonably priced financing so as to add an further unit to a property. To qualify for the MassHousing ADU mortgage, debtors should personal and occupy the single-family residence as their main residence.

How a lot can a house owner borrow for an ADU?

MassHousing says this system presents as much as $250,000 for a indifferent ADU and as much as $150,000 for an hooked up ADU.

Can a purchaser use this system earlier than shopping for a house?

Based mostly on MassHousing’s printed eligibility guidelines, this system is for householders who already personal and occupy a single-family residence as their main residence and who’ve plans, permits, and different pre-development supplies in hand.

That implies most consumers would wish to buy the house first and apply later, as soon as the venture is prepared for development.

What can the MassHousing ADU mortgage be used for?

MassHousing says the funds should be used to cowl the prices of setting up an ADU. This system helps new ADU development both throughout the current residence or elsewhere on the lot.

What ought to a homebuyer test earlier than relying on an ADU?

A homebuyer ought to overview native zoning guidelines and whether or not an current ADU was lawfully constructed and inspected.

Patrons must also keep in mind that an ADU is a everlasting a part of the property and can’t be bought individually from the first home.