The firm has secured the Best Western Hotel making 80 rooms available from Monday to Thursday every week.
Lynch said it is a challenge finding accommodation in the area and will offer operators and partners a fixed-rate option available year-round.
The hotel offers amenities including an onsite gym, swimming pool, and relaxation plus microwaves and laundry facilities providing guests with the comforts of home while staying close to major projects across Suffolk.
Merrill Lynch, Joint Managing Director said: “We are dedicated to supporting our customers in any way possible. Our strategic investment in this hotel allows us to offer additional support to the contractors working on Sizewell C.
“Additionally, we are committed to providing comfortable and affordable accommodation for our team who are working hard to help our customers build Sizewell C.”