Whether you are building a Lego dolls house or a mansion fit for a king, what building would be complete without some doors and windows. Be sure to match doors, shutters and glass to the correct frames.

LEGO Window Frame 1 x 2 x 2 with 'POLICE' with 2 Holes in Bottom (2377) From: $0.01. LEGO Window Frame square slightly sloped. From: $0.08. LEGO Window Frame 3 x 8 x 6 Bay (30185) LEGO Window 1 x 4 x 6 with 3 Panes and Transparent Fixed Glass (6160) From: $0.27.

LEGO Window Frame 1 x 4 x 5 with Fixed Glass has been used in at least 26 LEGO sets over the past 43 years, since it was first used in 1982.

LEGO Window Frame 1 x 2 x 3 (3233 / 4035) has been used in at least 64 LEGO sets over the past 45 years, since it was first used in 1980.

LEGO Window Frame 1 x 4 x 3 with Shutter Tabs (3853) has been used in at least 220 LEGO sets over the past 47 years, since it was first used in 1978.

LEGO Window Frame 1 x 4 x 3 (60594) has been used in at least 533 LEGO sets over the past 18 years, since it was first used in 2007.

LEGO Window Frame 1 x 2 x 2 with 2 Holes in Bottom (2377) has been used in at least 125 LEGO sets over the past 38 years, since it was first used in 1987.

LEGO Blue Window Frame 4 x 4 x 3 Roof has been used in at least 2 LEGO sets over the past 41 years, since it was first used in 1984. You can also find this part in at least 7 other colors. It has a design ID of 4447 which can usually be found molded into the bottom of the part.

LEGO Window Frame 1 x 4 x 2 with Solid Studs (4863) has been used in at least 60 LEGO sets over the past 40 years, since it was first used in 1985. Double; Panel; Wall

Attention to studs: not to be confounded with part 4033 where all 4 studs are hollow. LEGO Window Frame 1 x 4 x 3 (center studs hollow, outer studs solid) (6556) has been used in at least 36 LEGO sets over the past 32 years, since it was first used in 1993.