Thanks Eric. No wonder I couldn't find it . Is it useful to learn this "new" scale 1-2-4-5-6 all over the neck ?
Paleo has the pattern pretty much covered as regards to the pattern being a subset of the Major scale (I don't know your music background but, just in case, the major scale is the do-re-mi-fa-so-la-ti-do that Julie Andrews sang about).
Griff calls the pattern the "house" pattern because its shape on the fretboard resembles a stylized house on the first 3 strings. It looks like that because of the oddity of the b string on the guitar. If you start moving it onto other string groups it really won't look like a house any more.
If, by chance, you mean "in all keys" by "all over the neck" then yes. Griff shows the root note of the pattern which you'd use to locate the spot on the neck for the house pattern. If you are playing a Blues in D then you'd locate the D on the b string. If you are playing a Blues in F then you'd locate the F on the b string. Once you locate the root on the fretboard the house pattern will always be the same.
if, by chance, you mean to use the house pattern as an actual scale then you should understand that the pattern doesn't contain a 3rd or a 7th and those are the two most important chord tones, diatonically speaking, in western music. And not having a 3rd or a 7th is what gives the major house its ability to be used in a major blues. You can bend the b string with your ring finger either a whole step to get the major blues sound or a half step to get the minor blues sound. And since the major 7th is difficult to finger or bend to from that pattern there is little danger of hitting a "clinker" when using the major house, in a major blues.
Interesting enough, for us music theory geeks, the Major House pattern fits into a class of pentatonic scales used in traditional Japanese folk music. (Warning, theory is coming, plug your ears and shout LA LA LA LA while running out of the room

). I'm showing here two pentatonic scales that are common in Japanese music, the Yo scale and the In scale. The third pentatonic scale is the BB Box, or the Major House pattern.
I've rearranged the notes a bit so they fit on the staff and are comparable. The theory of the Yo scale is that it is two sets of perfect 4ths (red brackets) with a note in the middle of each 4th (blue arrow). The In scale is the same, two perfect 4ths with a note in the middle. You can also see the Major House is also two perfect 4ths with a note in the middle.
Now in Japanese traditional folk music the Yo scale is used for a "happy, joyful" song. If you play that scale as written above you'd probably recognize it from WWII movies

The In scale in folk music is used to denote "foreboding, sad" songs. It also might be recognizable.
Here is the interesting part to me. The middle note of the Yo scale is a minor 3rd (3 half steps) the middle note of the In scale is a minor 2nd (1 half step) and the middle note of the Major House is a major second (2 half steps). So the Major House sits exactly in between the Yo scale and the In scale.
So the Major House Pattern can be thought of as the In-Yo-House scale

Theory over, back to our regularly scheduled program.
By the way, in this course you get the Major House in the very first lick of the very first solo (if I remember correctly, it's been years since I learned those solos). I think it was called shuffle in g or something like that.
Eric