Quick answer: A straightforward loft with clear access and a dry existing layer is one of the simpler jobs in home improvement. The time it takes depends mainly on the size of the loft, how easy it is to get into and move around, whether old insulation has to come out, and whether boarding, a ladder or ventilation work is being added. Your written quotation sets out the scope, and we will tell you how long we expect your job to take before you agree to anything.
We don't publish standard timings, because a promise that doesn't fit your loft is no use to you. Instead, this guide explains what makes a job quicker or slower, so you know what to expect.
What affects how long it takes
Size and shape of the loft
A bigger loft simply takes more material and more time to lay. Shape matters as well. A simple rectangle with a good roof pitch is quicker than a loft broken up by chimney breasts, water tanks, purlins and changes in level, or one with very low eaves where the installer has to work lying down.
Access
A good-sized hatch and a ladder make a real difference, because every roll of insulation goes up through that opening. A small or awkwardly placed hatch, or no ladder at all, slows things down. If you would like easier access for the future, a loft ladder can be fitted at the same visit.
What is already there
If the existing insulation is dry and in decent condition, it stays, and we lay a new layer across the joists. That is a top-up, and it is usually the quickest kind of job. If the old insulation is damp, crushed or contaminated, it has to be bagged up and taken out first, which adds time. Our loft insulation removal page explains how that part works.
How much you have stored up there
Insulation can't be laid properly under boxes, old furniture or suitcases. If the loft is full, it needs clearing before work starts. Clearing it yourself beforehand saves time on the day.
Extra work in the same visit
Many people combine insulation with other loft jobs. Each adds time, and each is listed in your quotation:
- Raised loft boarding for storage above the insulation.
- A loft ladder, if the hatch is suitable or can be adapted.
- Ventilation improvements, such as clearing blocked eaves or adding vents.
- Lagging pipes and the cold water tank, which should be done whenever the loft is insulated.
Things we only find once we are up there
Occasionally the assessment or the installation turns up something that needs dealing with first, such as signs of mice or rats, a roof leak, or electrical cables in poor condition. We won't carry on and bury a problem. We will explain what we found and agree any extra work with you before doing it.
How the process runs
- Free assessment. We look at the loft, measure the existing insulation, check its condition, the ventilation and access, and note anything that needs attention.
- Written quotation. You get a written quote that sets out the scope, materials and price, so you know exactly what is included before anything is agreed.
- Installation. On the agreed day the installers protect the area around the hatch, carry materials up, and lay the insulation, typically one layer between the joists and one across them to reach 270mm of mineral wool.
- Completion checks. Before leaving, we check the depth and coverage, make sure the eaves are clear, and tidy up.
The work is carried out by The Insulation Company or an approved installation partner.
Do I need to be at home?
Someone needs to let the installers in and be available at the start and the end so we can talk you through what has been done. You don't usually need to stay in one room or leave the house. Most of the work happens in the loft, and the main disturbance downstairs is people coming and going through the landing.
How to get your loft ready
- Clear the loft of stored items if you can, or tell us at the assessment if you need help with that.
- Clear the landing under the hatch so there is room for a ladder and materials.
- Move anything fragile from the route between the front door and the hatch.
- Tell us about pets, especially cats, who like to explore an open loft.
Is it messy?
Mineral wool can shed fibres while it is being handled, so installers wear protective clothing and keep the work contained to the loft as far as possible. We protect the area under the hatch and clear up before we go. Once it is laid and left undisturbed, the insulation stays where it is.
Planning a bigger loft project?
If you want insulation, boarding and a ladder together, it often makes sense to do them in one visit so the insulation is laid first and the boarding goes in above it without crushing it. See our guide to boarding over loft insulation, and our explanation of how thick loft insulation should be. For more about the service itself, see loft insulation.
We work in homes across Teesside and the North East, and the assessment is the point where you get a clear idea of timing for your own loft.
Every job starts with a free assessment and a written quotation that sets out the scope, materials and price before anything is agreed. The work is carried out by The Insulation Company or an approved installation partner. Call 0800 229 4668 (Monday to Saturday, 8am to 6pm) or request your free assessment online.