Start by making sure that your sub-floor is completely level, your sub-floor is the floor you’re intending to lay the laminate on. Depending on whether your sub-floor is wooden or concrete will determine how you go about levelling it.
Wooden sub-floors can be levelled with two different materials. Hardboard is mainly used when the floor requires little levelling and can be fitted using a good staple or air gun. Hardboard is relatively thin coming in thicknesses of 1/8 inch which makes it easier to work with but less ridged than the second option which is plywood. Depending on how uneven your floor is should determine which material you use if your sub-floor is very uneven then use plywood.
Where your sub-floor is made of concrete you will have to level it using a self-levelling screed. You will also need to lay a membrane layer over the screed to stop moisture escaping and damaging your flooring.
With the sub-floor completely level you’re now able to start the main job. Start by fitting the underlay to the sub-floor. Fix your underlay to the sub-floor either by using glue for concrete or staples for wood as this helps the underlay to stay in place when laying your laminate boards.
After you have fitted your underlay securely to the sub-floor you can start to lay the laminate floor. With your back facing the door start laying the boards in the far left hand corner of the room. Lay the laminate boards from left to right allowing a 5-8mm gap with spacers. When you get to the last piece on the right you will need to measure this and then cut to size, be sure to leave a 5-8mm spacer on the sides as well as the fronts.
When you have finished your first row, repeat again for the second and third row. By using as many wedges or spacers as possible your three rows of laminate should be tightly fitted this will ensure they don’t move when fitting the rest of the boards.