That repair is usually $100–200, plus the cost of the chips.

If you’re paying someone to desolder and resolder RAM chips on a laptop motherboard, that’s the ballpark. The chips themselves can be $20–80 depending on capacity and availability, so total could hit $300 in a worst case.

The reason it’s not cheap: this isn’t a simple swap. It takes hot air rework station skills, steady hands, and a motherboard that actually has replaceable pads (some modern boards have RAM soldered directly onto the CPU package—those you can’t fix).

If the machine is worth more than ~$400 and you need the extra RAM, it can make sense. But cheaper to just buy a laptop with the RAM you want from the start.

You can also check if your board has an extra RAM slot—some “soldered” laptops still have one expansion slot. That’s a $50 upgrade, not $200.