WWAV Rapp Collins and EHS Brann, which handle British Gas' energy work and home-services brief respectively, have worked with the utility company since 1994.
The review of the £6.5m account follows the arrival of marketing director Amanda MacKenzie last year.
She said that British Gas had an excellent relationship with all its agencies, but that as a matter of due diligence, it was time to see whether it could 'work smarter'.
The pitch process will start next month and is due to be resolved by May.
Separately, British Gas is also to centralise the production of its print artwork.
Overall, the company spends more than £35m on marketing activity in the UK, with TV advertising accounting for the biggest share.
In September, British Gas kicked off a campaign urging customers to use less energy (Marketing, 18 September). The activity, created by CHI, informed consumers that by turning their heating down by 1 degsC, they could save up to £49 a year.
The same month, the utilities supplier announced that it was to promote its HomeCare boiler-repair service with an integrated campaign through EHS Brann. It comprised press inserts, DRTV and online activity.
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