Price to Fit Flooring in a Loft For Extra Storage

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How much does it cost to board out a loft so the area can be used for storage? How long does this work take and will it affect the insulation?

Loft spaces are not actually designed to hold additional weight, but you can still use the area for storing items that are not too heavy. Should you wish to use the loft to store a lot of heavy items then this may cause damage to the ceilings, so additional structural support would be needed first.

This page doesn’t cover any structural work, just the cost of boarding out the loft and a separate cost for insulation.

Three Options to Consider

1) Board out the loft with chipboard fixed directly above existing ceiling joists.

This is the cheapest option but it has its drawbacks. We only suggest you consider this option if you want to board out a small area of your loft. If you want the entire loft boarded then consider the other two options.

2) Fix timbers onto the joists to raise the height of the loft floor, lay additional insulation between joists then board out

This option is the most common; additional timbers are fixed onto the joists so there is extra room for more insulation between each joist. The decking boards are then laid onto the extended joists.

3) Lay insulation boards above existing joists, then board out on top of boards

Rigid insulation boards can be laid over the existing joists, the decking is then placed on top of the insulation boards. This option offers the best thermal protection but is also the most expensive.

How Not to Board Out Your Loft

If the decking boards compress the loft insulation then your home will be less energy efficient. It’s very important that the boards are lifted above any insulation. If you have traditional loft insulation such as Rockwool then you ideally want it to be 150mm thick and uncompressed.

It is also important that the decking boards are not installed too far into the eaves as this may block ventilation from eaves vents. This can result in loft condensation.

Do not board out the loft with the intention of storing lots of heavy items up there, this will cause the joists to bend and the ceiling to crack.

Material Costs:

These are quite cheap actually:

18mm chipboard decking costs £10 per sheet (2400m x 600mm)

Rockwool loft insulation is dirt cheap and certainly worth considering if your current insulation is less than 150mm – >See example on this website

Rigid insulation boards are more expensive, don’t forget you will still need timber decking on top of the boards, they are rigid but not that rigid. See Amazon website

Our Price Examples

Below are our cost examples for the most common ways to board out a loft for storage space. On average, the cost is either £228.00 or £1050.00 depending on which option is specified and size of loft.

The first price is to partially board out the loft with 18mm chipboard decking close to the hatch. In total, 5.5 square metres of boards will be installed with no additional insulation. The job will take a few hours at most, a nice and simple job, perhaps suitable for a handyman to complete:

LocationMedium Sized BusinessLarger Business (5+ employees)
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here
London Area£225.00£300.00
South, SW and Midlands£200.00£250.00
Outer Region and North£175.00£225.00



The second quote is to board out the loft on a typical semi-detached house, 45 square metres of decking boards will be installed. The joist height will be extended and some additional loft installation will be laid. The job will take two people one day, best to use a competent professional for this type of work:

LocationMedium Sized BusinessLarger Business (5+ employees)
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here
London Area£1100.00£1250.00
South, SW and Midlands£1000.00£1100.00
Outer Region and North£900.00£950.00

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One Response to “Price to Fit Flooring in a Loft For Extra Storage”

  1. StuartDecember 29, 2016 at 6:59 pm #

    Looking for a quote for boarding out loft space approx 6m X 6m also a pull down loft ladder in the altrincham area

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