ADJ

planned, proposed
home, kitchen
one-storey, two-storey, etc.

VERB + EXTENSION

add, build

PREP

~ to
They're building an extension to their house

ADJ

one-week, two-year, etc.

VERB + EXTENSION

apply for, ask for, request
He's applied for an extension of his visa
get, receive
She got an extension for writing her essay
give sb, grant sb

ADJ

considerable, great, major, massive, significant
modest
further
This new job is a further extension of his role as a manager
general
gradual
a gradual extension of the powers of central government
hair
Hair extensions are pieces of artificial hair that are added to your hair to make it longer

ADJ

logical, natural, obvious
The team appraisal is a logical extension of the individual appraisal interview

PREP

by ~
The blame lies with the teachers and, by extension, with the Education Service