Appliances

Most major electrical appliances made today are slightly less than 30" wide to facilitate moving through interior residential doorways. Some may be wider, but their depth will still allow movement through doors. Apartment style appliances may be slightly less than 24" wide.
The height for fixtures such as door knobs and electrical outlets are to the center of the item.

Bar Depth

18" - 30"

Bar Height:

36" - 42"

Bar Foot Rail

8" high

Bath Tub

Length, 5'0", 2'8" Wide

Bed Sizes

King - 72"w x 84"l
Queen - 60"w x 82"l
Double - 54"w x 82"l
Single - 39"w x 82"l
Day bed - 30"w x 75"l
Crib - 30"w x 53"l

Bookcases

Low, 3 shelves - 42" high
High, 5 shelves, 72" high
Normal widths are 36" - 42"

Cable TV Outlet

18" above floor

Chair Seats

Bar seat/stool, nominal height 26"

Dining/kitchen

Nominal height 18"

Seat width

18"

Seat depth

16"

Coffee Table

Height - 18", low - 12"

Desk Height

28" (see also Typing Desk, keyboard)

Desk Top Sizes

Standard - 60" x 30"
Executive - 72" x 36"

Door Height

6'8" (80")

Door Width

Residential interior, usual, 2'6" (best is 2'8")
Residential exterior, 3'0"
Bathroom - 2'0"
Linen Closet - 1'6"
Powder Room - 2'0"

Door knob

Normal, 32½" high, but can go as high as 42"

Electrical Outlets

Normal outlet height - 18" above floor.
Counter top convenience/appliance outlet - 6" above counter top.
Stove outlet (220 volt) - 18" above floor but may be 24"

End Table

Nominal, 24" high

Handrails

On steps, 32" above tread, on level surfaces, 42" high

Ladder Rung

12" between rungs

Keyboard Height

Typewriter or computer, 26"

Kitchen Cabinets

Over counter type - 60" from floor to bottom surface of cabinets.
Depth - 18", Height - 30" - 42", but may to to ceiling

Kitchen Counter

Height, 36", depth, 24", but may be 30"

Mail slot

30" (as required by Canada Post and US Postal Service)

Pictures

This is an arbitrary height, the best guide is that the centre of the picture/painting should be at average eye level.  Use the average height of you and your partner as a guide

Phone, Wall

54" high

Handicap Ramp

Maximum slope, 1" in 12".  Minimum width, 32"

Shower Head

Nominal, 72" high

Shower Rod

72" high

Sink, Bathroom

32" high

Sofa

Dimensions vary, but the norms are:
3-seat sofa: 72"w, seat height: 17"
Single seat: 32"w, 36"d, seat height: 17"

Stair/Step

Normal stair riser height is 7½" but may be as high as 8" provided all risers are the same height.  See also, Treads

Switch Plate Height

Nominal, 52"

Tables

Dining/Kitchen - height, 28½" - 30".  Best is 29".  A 5' diameter round table will accommodate five people comfortably.  People require 24" each of table length to dine comfortably.  A 30" x 30" table will seat four people.  A 30"w x 60"l will seat six people and a 36"w x 72"l will seat eight people, 10 people in a crunch

Thermostat

Nominal, 58" above floor

Toe Clearance

Under counter - 4" - 6" in height, 4" in depth

Treads

Nominal depth for stair treads is 10".  this should be increased for the handicapped, to a minimum of 11".

Typing Desk

26"h x 18"d

Vacuum Cleaner

Outlets for a built-in vacuum, 18" above floor

Vanity, Bathroom

32" high, 20 - 22" in depth

Work Clearance

The space between a counter top and the bottom of a wall cabinet, minimum, 15", maximum, 20"