A basement guest or teen suite is a legal bedroom (egress window, at least 70 square feet and 7 feet in any direction, smoke and CO alarms, permanent heat), a bath reached by a hallway at least 3 feet wide without crossing the family room, a sitting area, and a closet. In a 1,000 to 1,300 square foot basement it takes roughly 350 to 500 square feet.
Use the plan for privacy: put the closet and bath between the bedroom and the family room, keep the bed off the TV wall and away from the mechanical room, and add solid-core doors and insulated walls. A dry bar or wet bar is usually simpler than a kitchenette, which can trigger second-unit zoning rules.
On this page
- What makes a basement guest suite or teen suite?
- What does a basement bedroom need to be legal in Minnesota?
- What are the best guest suite layouts for a 1,000 to 1,300 sq ft basement?
- How wide should the hallway to a basement bathroom be?
- What kind of bathroom belongs in a basement suite?
- How do I make a basement suite private and quiet?
- What closet should a basement bedroom have?
- Should a basement guest suite have a wet bar or kitchenette?
- How this plays out in a typical Twin Cities basement
- Questions people ask
What makes a basement guest suite or teen suite?
A suite is three rooms that work as one: a legal bedroom, a full or three-quarter bath the occupant reaches without crossing the main family room, and a sitting area that belongs to them. Add a closet, a door that closes, and often a wet bar or kitchenette, and you have a space where a visiting parent, a college kid home for the summer or a teenager can live with some independence.
Guest suites and teen suites use the same bones, but they are tuned differently.
| Guest suite | Teen suite | |
|---|---|---|
| Who it serves | Visiting family, in-laws, an adult child | A teenager living full time |
| Priority | Privacy, quiet, a bath close to the bed | Space for friends, gaming, study |
| Sitting area | Small lounge or reading chair inside the suite | Shared family room or a dedicated den next to the bedroom |
| Bath | Ideally reached from a short private hall | Hall bath shared with the family room is fine |
| Kitchenette | Coffee, mini fridge, microwave | Snack bar, mini fridge |
| Sound | Keep household noise out | Keep the teen's noise in |
What does a basement bedroom need to be legal in Minnesota?
Everything in a suite is optional except the bedroom rules. Minnesota uses the Minnesota Residential Code, based on the 2018 IRC with state amendments. City handouts summarize what inspectors check:
| Requirement | Rule | Source |
|---|---|---|
| Emergency escape opening | One operable egress opening in each basement sleeping room, including new sleeping rooms in existing basements | MN Rules 1309, R310 |
| Egress window size | 5.7 sq ft net clear (5.0 sq ft for grade-floor or below-grade), 24 in high, 20 in wide, sill no more than 44 in above the floor | Saint Paul |
| Window well | At least 9 sq ft, 36 in projection and width; ladder if deeper than 44 in | Saint Paul |
| Room size | 70 sq ft minimum, 7 ft minimum in any horizontal dimension | Saint Paul |
| Ceiling | 6 ft 4 in finished minimum when finishing an existing basement, including beams and ducts | Saint Paul |
| Heat | Permanent heat able to hold 68°F | Saint Paul |
| Smoke alarms | Inside each bedroom and outside it, hardwired, interconnected, battery backup | Saint Paul |
| CO alarms | Outside each sleeping area, within 10 ft of the bedroom | MN Rules 1309, R315 |
| Fuel-burning appliances | Not in a bedroom or drawing combustion air from it, unless direct-vent or in a sealed enclosure | Saint Paul |
Prior Lake adds a site rule worth knowing: basement egress windows need a 5-foot setback from the property line and cannot sit in a drainage and utility easement, and the permit needs a survey or scaled site plan for the well (Prior Lake). That is why I pick the bedroom wall by looking outside first. My egress window guide goes deeper.
Check with your city: egress, setback and alarm rules are enforced locally, and handouts differ between Saint Paul, Prior Lake, Lakeville and other cities.
What are the best guest suite layouts for a 1,000 to 1,300 sq ft basement?
In the reference basement, the fixed points decide the plan: the egress window location, where the plumbing stub or the main stack is, the beam line, the sump and the mechanical room. I give the suite roughly 350 to 500 square feet and leave the rest for the family room, storage and mechanicals. Here are the three layouts I use most.
Plan A: the end suite
The bedroom, bath and a small sitting nook take one end of the basement, behind a single door off the family room. The bedroom sits on the end wall with the egress window. The bath sits between the bedroom and the family room, which puts plumbing near the center of the house and gives you a sound buffer. Best for a guest suite in a 1,100 to 1,300 square foot basement.
Plan B: the hall suite
A short hallway runs from the family room past the bath to the bedroom. The sitting area is the family room itself. This is the most efficient plan and works well for a teen suite in a 1,000 square foot basement, because the bath doubles as the basement powder room for guests.
Plan C: the two-bedroom suite
Two bedrooms share a bath between them, with a small lounge. It takes two egress windows and is the right call when two kids, or a teen and frequent guests, will use the basement. It needs 1,200 square feet or more to leave a real family room.
| Plan A: end suite | Plan B: hall suite | Plan C: two-bedroom | |
|---|---|---|---|
| Basement size | 1,100–1,300 sq ft | 1,000–1,200 sq ft | 1,200–1,300 sq ft |
| Bedroom | About 11 × 13 ft plus closet | About 11 × 12 ft plus closet | Two at about 10 × 11 ft plus closets |
| Bath | Full bath inside the suite | Three-quarter bath off the hall | Shared full bath between bedrooms |
| Sitting area | Private nook, about 8 × 10 ft | Family room | Small shared lounge |
| Egress windows | 1 | 1 | 2 |
| Privacy | Highest | Moderate | Moderate |
| Best for | Guests, in-laws | Teen, occasional guests | Two kids, or teen plus guests |
Every bedroom size in that table clears the 70-square-foot, 7-foot minimums with room for a queen bed, nightstands and a dresser. For the whole-basement plan, see my layout zoning guide.
How wide should the hallway to a basement bathroom be?
The IRC sets a hallway minimum width of 3 feet (IRC R311.6 training summary), and the Minnesota Residential Code lists hallways with habitable space for its ceiling height rules (MN Rules 1309, R305). Three feet is a legal minimum, not a comfortable one. I draw basement suite halls at about 42 inches where the plan allows, because a guest is carrying a suitcase and a teen is carrying a laundry basket, and doors open into the hall.
- Keep the bath door out of the bedroom door's swing. Two doors colliding in a short hall is the most common layout flaw I fix.
- Use a pocket door where a swing does not fit. Lowe's recommends pocket doors for tight spaces where a swinging door does not have room to operate (Lowe's). My basement doors guide covers hardware.
- Watch the soffit. The main duct trunk often runs over the natural hallway location. The hall still needs the code ceiling height, so I route the hall under clear joists or plan the soffit height early.
- Light the hall from switches at both ends so nobody walks the hall in the dark at night.
- Night lighting at the floor or a low step light helps a guest find the bath in an unfamiliar house.
What kind of bathroom belongs in a basement suite?
A three-quarter bath with a walk-in shower is what I put in most suites. A tub matters only if young grandchildren visit often. The two questions that set the cost are where the drains go and whether the drains can reach the sewer by gravity.
- Ejector or not. The City of Edina explains that you need an ejector pump when plumbing fixtures sit lower than the municipal sewer line, as basement bathrooms often do, and that bathroom ejectors need a sealed lid, a vent and a check valve (Edina). My ejector pump guide covers this.
- Exhaust fan. Code minimums are 50 cfm intermittent or 20 cfm continuous, vented outdoors, and ENERGY STAR guidance is at least 70 cfm for intermittent fans (PNNL). Minnesota limits fans used for code ventilation to 1.0 sone continuous and 2.5 sone intermittent (MN Rules 1322.0403). A quiet fan matters more next to a bedroom.
- Ceiling at the fixtures. Saint Paul's handout requires 6 feet 4 inches at the center of the clearance areas for the tub, shower, vanity and toilet in an existing basement (Saint Paul). A shower under the duct soffit can fail this.
- Moisture-resistant drywall outside the shower, cement board inside it, as Home Depot recommends (Home Depot).
For the fixtures, BuildFlow's finish packages budget $400 for a standard vanity, $800 for premium, and $250 for the toilet. My basement bathroom types and costs and shower insert vs tile guides go through the options.
How do I make a basement suite private and quiet?
Sound is the reason a guest suite feels like a hotel room or like a cot in the family room. I handle it with the plan first, then with materials.
Use the plan as a sound buffer
- Put closets and the bath between the bedroom and the family room. A closet full of clothes and a bath with two doors are a buffer zone that costs nothing extra.
- Keep the bed wall off the TV wall. Never put the bedroom headboard on the other side of the family room TV.
- Keep the mechanical room away from the bedroom. A furnace cycling all night on the other side of the headboard is easy to avoid at the drawing stage and hard to fix later. Code also keeps fuel-burning appliances from drawing combustion air from a bedroom unless they are direct-vent or enclosed (Saint Paul), so the mechanical room door should never open into the suite.
Then add materials
- Insulate the interior walls and the ceiling around the suite, and seal gaps with acoustical sealant (Home Depot).
- Use 5/8-inch drywall, which Home Depot calls the best choice for soundproofing rooms, and consider resilient channel on the ceiling (Home Depot).
- Solid-core doors on the bedroom and bath, with a sweep and weatherstripping. Lowe's notes hollow-core doors do not offer high-quality sound blocking (Lowe's). BuildFlow's door set allowance is $300.
- Offset outlet boxes on shared walls instead of placing them back to back, so there is no direct hole through the wall.
My basement soundproofing guide covers ceiling assemblies and how far each upgrade gets you.
What closet should a basement bedroom have?
The Minnesota Residential Code text I reviewed sets bedroom size, ceiling height, egress, alarms and heat, and it mentions closets only to exclude them from floor area (MN Rules 1309). Still, a bedroom without a closet is hard to sell and hard to live in, so I always include one. For a suite I prefer a reach-in closet with bypass or bifold doors on the wall shared with the family room, where it doubles as the sound buffer. A walk-in only earns its space in a long-stay in-law suite.
- Do not count the closet toward the 70-square-foot bedroom minimum; floor area excludes closets.
- Do not put the closet on the egress window wall; the window needs a clear path from the bed.
- Put a light in the closet and a shelf high enough for a suitcase.
Should a basement guest suite have a wet bar or kitchenette?
A coffee station and a small fridge make a guest feel at home, and they keep a teen out of the main kitchen at midnight. How far you go matters, because the line between a wet bar and a second kitchen can become a zoning question, and the answer differs by city. Adding a cooktop, a range or a separate entrance can turn a basement suite into what a city treats as a second dwelling unit. I explain the rules city by city in basement kitchenette and guest suite rules.
| Option | What it includes | BuildFlow allowance |
|---|---|---|
| Dry bar | Counter, cabinets, mini fridge, coffee maker; no sink | $5,000 |
| Wet bar, stone counter | Adds a bar sink with water and drain | $8,500 |
| Wet bar with uppers | Adds upper cabinets for dishes and food | $12,500 |
| Kitchenette | Wet bar plus microwave or small cooking appliance | Check your city first; see the kitchenette guide |
If there is a sink, receptacles within 6 feet of the top inside edge of the bowl need GFCI protection (Mike Holt, 2023 NEC 210.8), and every basement receptacle must be tamper-resistant (Leviton, 2023 NEC 406.12). For bar layouts, see my dry bar, wet bar and kitchenette cost guide.
How this plays out in a typical Twin Cities basement
Take a 1,250 square foot basement in a 1998 Maple Grove two-story: poured walls, an 8-foot ceiling, a beam on the centerline, the main stack and a rough-in on the north side, the furnace and water heater in the northeast corner, the sump in the northwest corner, and a side yard on the west with plenty of setback for a well.
- Bedroom about 11 by 13 feet on the west wall with a new egress window and well, reach-in closet on the wall toward the family room.
- Three-quarter bath on the north side using the rough-in, reached from a 42-inch hall, pocket door to the hall, quiet fan vented outside.
- Sitting nook just inside the suite door with a chair and a dry bar or wet bar on the bath's plumbing wall.
- Family room on the south and east, TV wall on the east, never sharing a wall with the bed.
- Mechanical room in the northeast corner, door opening to the family room side, never into the suite.
- Sound: insulated walls and ceiling over the suite, 5/8-inch drywall, solid-core doors with sweeps.
For the total budget, see my basement finishing cost guide and the 50K / 65K / 80K budget breakdown. Egress and permits are covered in the Minnesota basement permit and egress guide.
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Design my basement with EmmaQuestions people ask
What does a basement bedroom need to be legal in Minnesota?
An egress window or other emergency escape opening, at least 70 square feet with 7 feet in any horizontal direction, a ceiling of at least 6 feet 4 inches in an existing basement, permanent heat able to hold 68°F, hardwired interconnected smoke alarms inside and outside the room, and a CO alarm within 10 feet. Check your city's handout, since rules are enforced locally.
How big does a basement have to be for a guest suite?
In my plans a bedroom, a three-quarter bath and a small sitting area take roughly 350 to 500 square feet, which fits well in a 1,000 to 1,300 square foot basement while leaving a real family room. A two-bedroom suite works best at 1,200 square feet or more.
How wide does a hallway to a basement bathroom need to be?
The IRC minimum is 3 feet. I design basement suite hallways closer to 42 inches where the plan allows, because doors open into the hall and people carry luggage and laundry through it.
Does a basement bedroom need a closet in Minnesota?
The Minnesota Residential Code text sets size, ceiling, egress, alarms and heat for bedrooms and does not set a closet rule; it only excludes closets from floor area. I still include a closet in every basement bedroom because it is expected and doubles as a sound buffer.
Can I put a kitchenette in a basement guest suite?
Often yes, but a cooktop or range, plus a separate entrance, can make a city treat the space as a second dwelling unit with its own zoning rules. A dry bar or wet bar with a fridge and microwave is usually the simpler path; check your city before designing a kitchenette.
How do I soundproof a basement bedroom?
Put closets and the bath between the bedroom and the family room, keep the bed off the TV wall, and keep the mechanical room away. Then insulate the walls and ceiling, use 5/8-inch drywall and solid-core doors with sweeps, and seal gaps with acoustical sealant.
Does a basement bathroom need an ejector pump?
Only if the fixtures sit lower than the sewer line. Some basements do; an ejector needs a sealed lid, a vent and a check valve. Your plumber can confirm the sewer depth before design.
Sources (13)
- Minnesota Rules chapter 1309, Minnesota Residential Code (DLI PDF) — Minnesota Residential Code adopts 2018 IRC; R310 egress per basement sleeping room and new sleeping rooms in existing basements; R305 ceiling rules include hallways; R315 CO alarms; closets excluded from floor area
- City of Saint Paul DSI: Finishing an existing basement handout — Bedroom 70 sq ft and 7 ft; 6 ft 4 in ceiling incl. obstructions; 6 ft 4 in at bathroom fixtures; 68°F permanent heat; smoke alarms inside and outside bedrooms, hardwired and interconnected; CO within 10 ft; fuel-burning appliance restrictions
- City of Saint Paul DSI: Egress window handout (2020 MN Residential Code) — Egress window 5.7/5.0 sq ft, 24 in, 20 in, 44 in sill; window well 9 sq ft, 36 in; ladder over 44 in
- City of Prior Lake: basement finish and egress window handout — Egress window 5 ft setback from property line, no drainage and utility easements, survey or site plan
- Montana DLI training: 2021 IRC means of egress (R311.6 hallways) — IRC R311.6 hallway minimum width 3 ft
- Lowe's: Interior doors buying guide — Pocket doors for tight spaces; solid-core vs hollow-core sound blocking
- The Home Depot: How to soundproof a room — Insulation, acoustical sealant, resilient channels, solid doors, sweeps and weatherstripping
- The Home Depot: Types of drywall — 5/8-inch drywall best for soundproofing; moisture-resistant drywall for bathrooms and basements; cement board in showers
- City of Edina: Sewage ejector pump guide — Ejector pump needed when fixtures are below the sewer line; sealed lid, vent, check valve
- PNNL Building America Solution Center: Bathroom exhaust fans — Bath fan minimum 50 cfm intermittent / 20 cfm continuous; ENERGY STAR 70 cfm; vent outdoors
- Minnesota Rules 1322.0403: residential ventilation fan sound limits — Minnesota sone limits: 1.0 continuous, 2.5 intermittent (HVI 915)
- Mike Holt: 2023 NEC 210.8 GFCI protection (PDF) — GFCI for receptacles within 6 ft of a sink
- Leviton Captain Code: Tamper-resistant receptacle requirements expanded (2023 NEC 406.12) — Tamper-resistant receptacles required in dwelling units
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