Ideal for contractors, architects, and homeowners planning additions, remodels, or new builds. This includes minimums, comfortable averages, and upper ranges for common rooms and spaces:

🛏️ Bedroom (Regular & Master)

Type	Minimum Size	Comfortable / Standard	Large / Luxury
Small Bedroom	9′ x 10′ (90 sq ft)	10′ x 12′ (120 sq ft)	12′ x 14’+ (168+ sq ft)
Master Bedroom	12′ x 14′ (168 sq ft)	14′ x 16′ (224 sq ft)	15′ x 20’+ (300+ sq ft)
Bedroom Closet	2′ x 5′ (reach-in)	6′ x 6′ walk-in	8′ x 10’+ walk-in

🚿 Bathroom (Full, Half, Master)

Type	Minimum Size	Comfortable / Standard	Large / Luxury
Half Bathroom	3′ x 6′ (18 sq ft)	4′ x 6′ (24 sq ft)	5′ x 6’+
Full Bathroom	5′ x 8′ (40 sq ft)	6′ x 10′ (60 sq ft)	8′ x 12’+ (96+ sq ft)
Master Bathroom	8′ x 10′ (80 sq ft)	10′ x 12′ (120 sq ft)	12′ x 15’+ (180+ sq ft)
Shower	3′ x 3′ min	3′ x 5′ or larger	4′ x 6’+
Tub	5′ standard length	5.5′ – 6′ for comfort	Up to 6.5’+
Toilet Space	30″ wide min	36″ preferred	Private room 3′ x 5’+

🛋️ Living Room / Family Room

Type	Minimum Size	Comfortable / Standard	Large / Luxury
Small Living Room	10′ x 12′ (120 sq ft)	12′ x 18′ (216 sq ft)	15′ x 20’+ (300+ sq ft)
Family Room	12′ x 14′	14′ x 18′	16′ x 20’+
Open Concept	Usually combined with dining/kitchen (400–600+ sq ft total)

🍽️ Dining Room

Use	Minimum Size	Comfortable / Standard	Large / Luxury
Small Dining	8′ x 10′ (80 sq ft)	10′ x 12′ (120 sq ft)	12′ x 16’+ (192+ sq ft)
Open Dining Area	Integrated into open plan (e.g., 12′ x 18′)

🍳 Kitchen

Type	Minimum Size	Comfortable / Standard	Large / Luxury
Small Kitchen	8′ x 10′ (80 sq ft)	10′ x 12′ (120 sq ft)	12′ x 18’+ (200+ sq ft)
Kitchen Island	3′ x 5′ min size	4′ x 8’+ (with seating)

🚪 Hallways, Doors & Circulation

Element	Minimum	Comfortable / Standard	Notes
Hallway Width	36″ (code min)	42″–48″	48″ preferred in high traffic
Bedroom Door	30″ wide	32″–36″	36″ for accessibility
Bathroom Door	28″ min	30″–32″	32″ preferred for aging-in-place
Closet Door	24″–28″	30″+ for walk-in	Sliding or bi-fold options

Laundry Room

Type	Minimum Size	Comfortable / Standard	Large / Luxury
Stackable Washer	3′ x 3′	5′ x 6′	6′ x 8’+
Side-by-Side W/D	5′ x 6′	6′ x 8′	8′ x 10’+
Mudroom Combo	6′ x 10′ or larger	Room for bench, cubbies

🧱 Other Useful Sizes

Space	Minimum	Standard	Notes
Stair Width	36″	42″+	Wider for moving furniture
Landing at Stairs	3′ x width	4’+ deep	Required where direction changes
Closet Depth	24″	26″+	30″ for coats or storage
Garage (1-car)	12′ x 20′	14′ x 22′	16′ x 24′ for comfort
Garage (2-car)	20′ x 20′	22′ x 22′ or larger	Extra storage on side