An attached family home is a residence built for one household that shares at least one structural wall with a neighboring unit, with its own entrance, living space, and utility connections. Duplexes, townhouses, and rowhouses all fall under this label. What varies, and what matters most to you as an owner, is how the property is legally classified: whether you hold full title to the land beneath your unit or share ownership of the structure with everyone else in the project. That single distinction shapes your mortgage options, your insurance needs, your maintenance obligations, and your rights over the walls themselves.
The Common Forms
The term covers several housing styles that look different but share the same basic shared-wall arrangement.
- A duplex is two units sharing a single center wall, often built on one lot. Some duplexes split the lot with a property line running through the shared wall, giving each owner a separate parcel.
- A townhouse is three or more units joined side by side, typically two or three stories tall, usually sitting on individually platted lots.
- A rowhouse is functionally similar to a townhouse but built in a continuous line with a uniform facade, a form more common in older East Coast cities.
- Triplexes and fourplexes follow the same shared-wall pattern with three or four connected units. Local zoning codes may classify them as small multifamily rather than single-family attached housing.
All of these arrangements fit more homes onto less land than detached houses while keeping the feel of a private residence. The roofline is typically continuous but structurally independent at each unit boundary, and each unit has its own utility connections. The higher density has a real consequence: your neighbor’s maintenance habits can affect your property in ways they wouldn’t with a freestanding house.
How You Actually Own It: Fee Simple or Condominium
Attached homes are sold under one of two ownership frameworks, and the difference is more consequential than most first-time buyers realize. The framework is recorded in your deed and controls what you own outright, what you share, and who decides when the roof gets replaced.
Fee Simple
Fee simple gives you full title to the dwelling and the specific plot of land beneath it, usually including a small yard. Your property lines typically run through the center of the shared walls, so you own your half of each common wall. This structure is common for townhouses on individually platted lots. It gives you more autonomy over the land and makes the property feel closer, legally, to a detached house. You can sell, modify, or refinance without the same layers of shared governance a condominium brings.
Condominium
Under a condominium, you own the interior airspace of your unit and hold an undivided interest in the land, exterior walls, roof, and other common elements along with every other owner. Your deed refers to a specific unit number within a master plan rather than a parcel of land. The Master Deed or Declaration of Condominium spells out exactly where your individual ownership ends and shared ownership begins. That boundary matters most when something breaks. Whether you replace a section of exterior siding yourself or the association handles it depends entirely on what the declaration says. In a project with a “bare walls” policy, the association covers only the structural shell, and everything inside the drywall is yours to maintain and insure.
Party Wall Rights and Obligations
When two owners share a structural wall, the law treats it as a mutual easement. Each side has the right to rely on the wall for structural support, and neither side can do anything that weakens it. A party wall agreement formalizes these rights in a recorded document that attaches to each property’s title and binds every future buyer, not just the original signers.
These agreements typically cover who pays for repairs, what kind of work requires the neighbor’s consent, and how disputes are resolved. The cost-sharing terms vary. Some agreements split repair expenses equally. Others allocate costs based on which side caused the damage or benefits more from the work. Don’t assume a 50/50 split. If you’re buying an attached home with fee simple ownership, reading the recorded party wall agreement before closing is as important as reading the title report.
One practical issue catches owners off guard: you generally cannot modify the shared wall without your neighbor’s cooperation. Adding an electrical outlet, hanging heavy shelving with deep anchors, or running new plumbing through the common wall could affect the structure or the neighbor’s side. Starting that work without notice can create legal liability if anything goes wrong.
HOA Rules, Dues, and Special Assessments
Most attached-home communities operate under a set of Covenants, Conditions, and Restrictions managed by a homeowners association. These CC&Rs define what you can and cannot do to your property’s exterior, with the goal of keeping a uniform appearance across connected units. In practice, that means submitting an architectural review application before you change a front door, swap out windows, or repaint. The association can reject materials or colors that clash with the rest of the building.
Residents pay regular assessments to fund common-area maintenance. Fees vary enormously depending on amenities, location, and the age of the buildings. Some modest developments charge a few hundred dollars a year. Others, particularly those with pools, fitness centers, or beachfront common areas, charge well over $1,000 per month. The national average hovers around $170 per month, but that figure masks wide variation.
The association typically handles major shared projects like roof replacements, exterior painting, and structural repairs to common elements. Violating the CC&Rs can result in fines, and unpaid fines or assessments can become liens against your property. In attached housing these rules carry more weight than in a detached-home subdivision, because one owner’s neglect or unauthorized renovation can physically damage the neighboring unit.
Beyond regular monthly dues, an HOA can levy special assessments to cover major repairs or unplanned expenses that the reserve fund can’t absorb. A failing roof on a connected row of townhouses might trigger an assessment of several thousand dollars per unit. Before buying, review the association’s financial statements and reserve study. A well-funded reserve means the HOA has been saving for predictable repairs. A thin reserve combined with aging buildings is a signal that a special assessment could land shortly after you close.
Insurance: Master Policy vs. Your HO-6
Insurance in attached housing is split between the association’s master policy and your individual coverage. Misunderstanding the boundary is one of the most expensive mistakes owners make.
The HOA’s master policy generally covers the building’s exterior structure and common areas. Your individual policy, known as an HO-6 or “walls-in” policy, covers what the master policy leaves out. That typically includes your personal belongings, interior fixtures like cabinets and flooring, any upgrades you’ve made, personal liability if damage originating in your unit affects a neighbor, and temporary living expenses if the unit becomes uninhabitable after a covered event.
Here is the gap that catches people. If the association carries a “bare walls” master policy, your HO-6 needs to cover everything from the drywall inward, including fixtures that feel like part of the building. If the association carries an “all-in” policy, original interior finishes may be covered under the master, but your upgrades still aren’t. Read both policies before assuming you’re covered. Two common exclusions are worth noting: water backup and sump overflow are typically excluded from standard HO-6 policies and require a separate endorsement, and loss assessment coverage, which helps pay your share if the HOA’s master policy gets maxed out after a major event, is another endorsement worth adding.
Financing: PUD vs. Condominium Classification
Lenders and government-backed loan programs treat attached homes differently depending on whether the property is classified as part of a planned unit development or a condominium project. That classification can determine whether you qualify for certain mortgage products at all.
For FHA-backed loans, the difference is stark. A condominium project must be on the FHA-approved list before a borrower can get an FHA-insured mortgage for a unit in that project. The approval requirements include minimum owner-occupancy rates of at least 50 percent, limits on how many units a single investor can own, caps on FHA concentration within the project, and restrictions on commercial space. No more than 15 percent of units can be delinquent on their association dues.1U.S. Department of Housing and Urban Development. Condominium Project Approval and Processing Guide If the project hasn’t gone through this approval, FHA financing is generally unavailable, though a single-unit approval option exists in limited cases.
Planned unit developments face a different and usually simpler path. PUD eligibility requires automatic, non-severable HOA membership, mandatory assessments, and HOA ownership of common property, but it skips the project-wide approval process that condominiums require. The practical effect is that an attached townhouse classified as a PUD is often easier to finance than an identical-looking unit classified as a condo, simply because the project hasn’t gone through the condo-approval hoops. If you’re shopping for an attached home with an FHA loan, ask early whether the development is registered as a PUD or a condo. That one classification can make or break the deal.
What to Investigate Before You Close
Attached homes bundle a lot of shared obligations into what feels like a straightforward home purchase. Before you commit, dig into:
- The recorded party wall agreement, for fee simple properties. This document controls your rights and repair obligations for the shared wall. Make sure it exists, and read it.
- The CC&Rs and HOA financials, including the reserve study and recent meeting minutes. Look for deferred maintenance, pending litigation, or discussions about upcoming special assessments.
- The master insurance policy. Determine whether it’s “bare walls” or “all-in” so you can size your HO-6 coverage correctly.
- The property classification. Confirm whether the development is recorded as a PUD or a condominium, especially if you’re using government-backed financing.
- Sound insulation. Ask the builder or seller about the Sound Transmission Class rating of the shared walls. Local codes may not require any minimum, so what was actually built is what you’ll live with.
- Shared utility lines. In some attached developments, sewer laterals or other utility connections are shared between units. Find out whether the HOA or individual owners handle maintenance and repair of these lines.
The buyers who run into trouble with attached homes are almost always the ones who treated the purchase like a detached house and skipped the documents that govern the shared elements. Those documents are where the real terms of ownership live.