The Big Bang Theory

Apartment 4A

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The living room of Apartment 4A

 Apartment 4A is the primary setting for The Big Bang Theory, and is the apartment where Sheldon and Leonard live. It is situated in an apartment complex at 2311 North Los Robles Avenue. When viewed from the satellite photographics in "The Countdown Reflection" episode, it appears to be located at 215 South Madison Avenue. Due to the primary characters in the series, albeit Penny, being of the "nerd" social classification, the apartment has been dubbed as "Nerdvana" by Howard in season 1 episode 14 "The Nerdvana Annihilation".

Apartment 4A is located on the fourth floor of the building across from Apartment 4B, where Penny lives. 4A is known to be a corner apartment, being that it has windows facing outside on two sides.

Apartment 4A is also a hidden easter egg (apt 4A = foray)- either a "great raid" or the voice of Rocky the Flying Squirrel, June Foray.


The apartment has one living room, one bathroom, and two bedrooms. A hallway links the the living room to the bedrooms. The kitchen is part of the main living area.

Immediately upon entering, the wall on the right houses Sheldon and Leonard's desks and the TV. The wall ends in the kitchen part. This wall is rarely visible, being the wall that is the view into the apartment from which the episodes are filmed, and has only been shown on two occasions (one is in "The Euclid Alternative", S2E5). 

The wall immediately to the left after entering the apartment has a long bookshelf that ends at a small closet, with the wall itself ending at a large window with a desk and telescope. Pasadena City Hall can be seen from this window, which has been used on several occasions:

After the window, there is a corner and the hallway that leads to the bathroom, as well as Sheldon and Leonard's bedrooms. The kitchen area is a small area that has an island with rarely used barstools since they usually eat in the living room area. A window is located at the end of the visible wall of the kitchen area (which can be clearly seen in several kitchen area scenes, one typical instance is in "The Loobenfeld Decay" (S1E10), when Toby Loobenfeld talks with Sheldon in the kitchen area). Presumbly, this window is one of the two windows (the other being the large window described above) that Sheldon has stated "creates a cross breeze" when he describes his Spot.

Sheldon, at one point in time, had painted luminous glow-in-the-dark arrows on the floor pointing to the various nearest emergency exits throughout the room. He shows them to Raj in "The Roommate Transmogrification" (S4E24), but gets rid of them before "The Friendship Contraction" (S5E15) when he explains that they were "wildly carcinogenic".

Production-wise, the bathroom interior, Sheldon's bedroom, and Leonard's bedroom are actually filmed on a different set than the rest of the apartment. The actual apartment set ends at a corner in the hallway immediately after the bathroom door which is for easier filming access and better view of the actors for the studio audience.


New Room

Leonard discovers how difficult it was for Sheldon's former roommate to live with him.

In "The Staircase Implementation", the story of how Leonard and Sheldon meet is revealed. Sheldon places an ad for a roommate after his former roommate, Sebastian, is driven to the brink of madness from Sheldon's antics. Leonard encounters Sebastian on his way to the interview with Sheldon, and he tells Leonard to run far away. Leonard is accepted by Sheldon as his new roommate and inherits Sebastian's former room, only to discover that Sebastian wrote "DIE SHELDON DIE" in red paint (like in a slasher film) on the wall.

At this time, the apartment also had significantly less furniture in the living room. Sheldon's only placement was two lawn chairs and cinder blocks as the TV stand. Even at this point in time, Sheldon's lawn chair was placed in the exact spot that he claims later on the couch. Their first major addition in furniture to the apartment was the leather couch, in which Leonard buys for $100 from tenants on the first floor who were moving out; which is a great deal, since a new Moroni Havana Leather Sofa retails for around $1,500. Careful watchers may recognize the style of sofa; while the boys utilize the full 3 cushion sofa, defective detective Adrian Monk from the series "Monk" sports the smaller, two cushion model, of the line.

In "The Bozeman Reaction", the apartment got burglarized. Some of Sheldon and Leonard's game systems and various games were stolen. The police were also called to the apartment in "The Zarnecki Incursion", when Sheldon's World of Warcraft account was hacked.

In "The Staircase Implementation", an "apartment flag" is mentioned as a small blue flag with a coat of arms on it of a gold lion rampant on a field of azure on it. Flipping it upside down signifies that the apartment is in distress. In "The Roommate Transmogrification", Raj was given a lapel pin version.

Bathroom Edit

The bathroom is the first door down the hallway off the living room.

Check out The Bathroom

Sheldon's bedroom Edit

Sheldon's bedroom is located immediately after the bathroom. Sheldon usually keeps his bedroom locked, and supposedly rarely allows anyone inside, however, given the number of episodes where Leonard, Penny, his mother, Wil Wheaton, Amy, and others have been there, this appears to be more wishful thinking on Sheldon's part than actual practice.

Check out Sheldon's bedroom.

Leonard's bedroom Edit

Leonard's bedroom is the last room in the hallway. There is a ledge outside that runs by both bedroom windows. Sheldon uses this ledge during "The Bozeman Reaction" to access Leonard's room because he is too paranoid to go out of his bedroom because they were burglarized earlier in the episode.

Check out Leonard's bedroom.


The kitchen of the boys' apartment features an open floor plan that lets action flow easily between the living room and the kitchen space. The large butcher block type table provides a separate sitting area, allowing interactions in a setting more intimate than the clutter of the living room. The fridge and Sheldon's tea box provide "busy work" as the actors interact within the kitchen space, and it occasionally functions as an area allowing characters to briefly leave the room and re-enter quickly, allowing the characters remaining in the living room to talk or interact at their expense. For example the guys and Penny often laugh at Sheldon's quirks when he gets up to get a drink, and Penny famously touched Sheldon's food (taking and replacing an onion ring) when he left his spot on the couch for a brief beverage errand.

For more info, check out The Kitchen

Living Room Edit


Barewalls Vintage Flight III 

by Janet Van Arsdale

Seen to the left of the door in the pilot episode. Later replaced with the Captain Future poster.


Robots Exploring Desert 

By Michael Saul. 

Located at right of the front door above the shelves since the pilot episode.


Forbidden Planet Poster

From the 1956 sci fi cult film featuring Anne Francis and Robbie the Robot. 

Located on the closet door - replaced by another robotposter in the S01E02 - The Big Bran Hypothesis .

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Nikola Tesla Lab poster

Image shows Serbian physicist Nikola Tesla at his lab in Colorado Springs, circa 1899.

Located to the right of the closet, above the DNA helix.


The Helix Nebula

Image by Hubble Space Telescope

Seen in the alcove.


Orion Nebula

Image by Hubble Space Telescope

Seen in the alcove.


The Pillars of Creation - Eagle Nebula

Image by Hubble Space Telescope.

Seen in the alcove.


The Whirlpool Galazy M51 + Companion

Image by Hubble Space Telescope.

In the pilot it appears on it's side in the alcove. Starting in episode two, it is most frequently seen on the side of the fridge on the blackboard organizer. By season five, it moves around again, replaced with a WMAP image.

Electromagnetic Spectrum Chart'

Made by Boston Scientific and sold by American Educational Products. They update this chart every so often, so there are subtle differences with the one currently available today. The element chart portion in the one used on the set is in yellow, while the current version has it in orange . Seen leading from the living room into the hallway.


Captain Future poster 

Character created by Mort Weisinger during the 1939 World Science Fiction Convention. Pulp character adventures published from 1940 to 1951.

Replaces vintage plane photo to left of front door in S01E02.


International Space Station print

Solar panels against Earth's horizon.

This one is at a slightly different angle than the one on the show. Seen in the hallway just outside Sheldon's bedroom.

War of the Worlds poster

Painted by Frank R. Paul Seen in the hallway just before Leonard's room.


Black and white photo print of train wheels

On the wall in the hallway.

Similar to this print.


The Final Blow by Eric Joyner

Some people call this the "Rock Em Sock Em" poster.

Replaces a different robot poster located in the living room on closet door.

The Incident by Eric Joyner

Framed artwork at the top left of the bookshelves behind the couch.



Spirit of St Louis radio

Two valve model

Red Dell XPS M1710 laptop

Note: (special edition)

Meade 70mm Telescope

Model: 20218 NG-97SM


Spirit of St Louis radio

Standard model

LogiTech iPod Speaker Station

(on the bookshelf by front door)

Alienware M17 Nebula laptop

(replaced Sheldon's stolen Dell XPS)


Celestron 102 SLT Telescope

NexStar computerized model

Dyson 10" White Air Multiplier

(later seen in blue also)

Dell XPS Adamo

(replaced Leonard's stolen XPS)

Cordless phone

(since pilot episode)

aircraft vertical compass

(left of the front door since S01E04)

two antique phones with ringers

(on cardfile in alcove since S01E04)

Amazon kindle

(unknown which model)

Apple iMac

(unknown which model)


Ektorp-chair 27116 PE088333 S4-1-
Moroni Havana Leather couch

(with Sheldon's spot)

Ektorp armchair

 from Ikea

"The Thinker" bookends seen on Leonard's desk and in the bookshelves behind the couch

Blue "Button Down" pillow

Seen on the couch in the pilot and early episodes.

Wedgwood Rayon Chenille Throw

Seen on the couch in the pilot and first several seasons 

Better Homes & Gardens 

Candlestick Lamp 

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Better Homes & Gardens 

Silken Toast lampshade

Pillow Perfect Roxen Striped Pillows

Seen since [S01E14]

Gurli Orange throw pillow

Seen since [S01E17], usually on the Ektorp armchair

Camel colored plush throw blanket by Simple Deluxe

Replaces the blue throw blanket in [S02E07]

Gurli solid beige 20x20 throw pillow from Ikea

Replaces the blue button down pillow in [S02E07]

  • [pilot] Cocktail Table (where the gang usually eats and plays various games on)
  • [pilot] desks (for the laptops and iMac near the back window)
  • [pilot] Pubmaster dartboard by Sportcraft
  • [pilot] swing arm floor lamp in silver/nickel finish
  • [pilot] black wall switch and outlet accent covers by Leviton
  • [S01E02] marble-topped island vegetable bin with 2 drawers and towel bar, the the left of the front door
  • [S01E02] bankers chair
  • [S01E02] 30 drawer library card file
  • Large Pendant by Volume International, ceiling light for the alcove (appears to no longer be available in bronze finish).


  • Gaming is a huge part of the boy's lives and constitutes the major aspect of their social lives. Gaming is SO big, in fact, that it now has it's very own section on the wiki. See Games

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silver mesh pencil cup

Sheldon's Desk===

Celestial globe

celestial globe

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Star Wars itemsEdit


DC Direct Batman figurine


Build-A-Set Batman and Robin

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Gotham Knight statue


Build-A-Scene Green Lantern and Flash

Superheroes & figurinesEdit

Other film, television, pop cultureEdit

  • [S01E14] Dr. Who: a black dalek appears on the shelves behind the couch in The Nerdvana Annhilation
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RoboSapien figurine


Rubik's Cube tissue box


See Part 7: Shedding Light on Dark Matter of the book Unraveling the Mysteries of the Big Bang Theory by George Beahm (2011, BenBella Books, ISBN 9781936661312) for more fantasy, sci-fi, pop culture, and other items mentioned on the show in general.


  • Sheldon plans to never stop living with Leonard.


  1. Gee, look, a Kindle on the The Big Bang Theory, Matt Burns, TechCrunch, 8 December 2009


  • Living room area - watching Howard's launch into space.
  • Front door area.
  • Penny in Sheldon's bedroom taking care of him.
  • Kitchen area.
  • Optical laser chess set, seen by the alcove. Unique piece from Tommaso Baldacchini at Newport Corp. in Burbank, CA.Go to Optical laser chess set. Courtesy of Tommaso Baldacchini.
  • Early living room.
  • Couch was just moved in.
  • Early kitchen view.

See alsoEdit

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