Using my ILR application as a benchmark you will apply online 30 months (or from 28 days before this date) after you initially landed in the UK. You will then scan the documents and attend a biometrics appointment where they will take your fingerprints and picture (like for your spouse visa). They will check your scanned docs (or they can scan for you).
It depends on your circumstances to decide what documentation you need. The below is based on somebody with a child, renting and a salaried job.
Applicant
- BRP Card
- Passport
- Expired Passport
Sponsor
- Passport
- Declaration
Child
- Birth certificate
- British Passport
- Letter to home address dated within 90 days
Accommodation
- Expired tenancy agreement
- Letter from landlord stating they are happy for applicant, tennant and child to live there
- Latest Council Tax Bill
Employment
- 6x months of payslips
- 6x Bank Statement showing funds earnings entering account
- Letter from employer stating role, permanent employee, how long I have worked there and how long I have held the certain salaries
- Latest P60
Correspondence
6x pieces of mail jointly addressed to you both spread out every 4 months
or
6x pieces of mail addressed to applicant spread out every 4 months
&
6x pieces of mail addressed to sponsor spread out every 4 months
or
6x mixed pieces of joint mail and separate mail spread out every 4 months
There must be a joint piece of mail or, where not possible, two separate pieces of mail every 4 months. Basically there needs to be a piece(s) of mail with both your names on every 4 months. Whether it's separate or not doesn't matter. These need to be from at least 3 separate sources (eg. bank statement, gas bill, water bill, phone bill, NHS appointment)
Other
- Marriage Certificate
- IHS surcharge receipt
I may have missed one or two things there but that's the baseline. Have you been collecting your mail? You need to prove you've been living at the same address for the last two years (from the point of your application).