Loft Guard insulates lofts in homes across Portsmouth and the rest of Hampshire. As well as insulation, we board lofts for storage, clear them out and remove old material. You can see all our loft services here.
If your loft insulation looks thin, flattened or dirty, or it has been damp or had pests in it, it is probably not keeping much heat in any more. That heat escapes through the roof and your heating has to work lot harder. Topping up or replacing the insulation will keep your home warmer in the winter and helps it stay cooler in summer months. The Energy Saving Trust says an uninsulated home loses around a quarter of its heat through the roof.
No two lofts are the same, so we don't offer a one-size-fits-all package. What we recommend depends on the insulation you have now, how the house is built, the ventilation, and what you use the loft for. The Energy Saving Trust recommends at least 270mm of insulation for a typical loft, and new homes are often built with more. Read the Energy Saving Trust guidance.
We are a local, family-run loft insulation company, we are experts in delivering various loft services from loft insulation, loft boarding, spray foam removal etc. We do careful work at a fair price, if you are looking to upgrade your loft & would like us to visit your home for free loft survey just call/message, we can arrange quick appointment & visit. We will explain exactly the condition of your loft what it needs and why! With-out blowing our own trumpet we like to operate on a different level where our reputation & trust counts, these two factors take time to build and all our trusted reviews & future customer recommendations are all driven by this complete customer satisfaction. If there is something not right all our team work hard to put it right, after all you let us into your home and we treat your home like it was ours its the only way! You can read some of our reviews on our website, loftguard.co.uk or visit here.Checkatrade, Google Maps and Bark.
The first step is give us quick call or message and arrange free loft survey. Step two, we visit & check the health of your property's loft this usually takes around 10 minutes. Step three, we give you all the details on the condition of your loft and give you all the available options. Step four, there is never any hard sell. Step five, if you decide to go ahead we can get you booked in at your prefered date you can cancel or re-schedule at anytime we never ask for any payment upfront customers only pay when the job is complete and are happy. Loft Guard are fully insured & hold waste carrier's licence [both these documents are available to view].All our work comes with our 100% 25-year guarantee.
Loft insulation in Portsmouth homes
Many Portsmouth homes have loft spaces with insulation that has been installed over different periods, leaving a mixture of older and newer materials, compressed sections or areas where coverage is incomplete. An inspection can identify what is already there and whether it can be topped up.
If your insulation is in good condition, a top-up is often better than ripping it all out. The Energy Saving Trust advises checking the existing insulation first. If it's damaged, wet or squashed, it needs a closer look before anything new goes in.
Improve the thermal barrier between your heated rooms and the loft space above.
A well-insulated loft can help your home retain heat more effectively during colder weather.
Top up suitable existing insulation to improve coverage and reach the required specification.
Do you need new loft insulation?
Your loft may benefit from an upgrade if you can see any of the following:
- Insulation that is noticeably thin compared with current recommendations.
- Compressed or flattened insulation.
- Visible gaps between sections of insulation.
- Uneven coverage across the loft floor.
- Older insulation that has been damaged or affected by moisture or pests.
- Areas around the loft hatch or edges that have little or no insulation.
- Existing boarding that compresses insulation or prevents adequate coverage.
These signs do not automatically mean everything needs replacing. A proper assessment helps determine whether existing material can remain, be repositioned or be topped up.
How we upgrade loft insulation
In a standard loft that's easy to get into, we usually lay insulation between the ceiling joists, then add a second layer across them. The Energy Saving Trust recommends at least 270mm for a typical loft. Exactly what we fit depends on your house and the state of the insulation already there.
If you want to retain your loft for storage, the insulation and loft boarding need to be considered together. Raising a storage deck above the insulation can help avoid compressing the material and allows the loft floor to remain usable.
Why loft insulation matters
Heat naturally moves from warmer areas towards colder areas. In a home with an inadequately insulated loft, heat can escape through the ceiling and roof. Loft insulation adds thermal resistance, helping reduce this heat transfer.
The Energy Saving Trust says loft insulation cuts the heat lost through the roof, so your home stays warmer and needs less heating. How much difference it makes depends on how your house is built, the insulation you have now, your heating and how you use the home.
What happens on the day
A typical project starts with an assessment of the loft. The existing insulation, access, joists, ventilation and any obvious issues are considered before work begins.
- Assess the loft: inspect the existing insulation and general condition.
- Prepare the area: create safe access and identify obstacles or areas requiring attention.
- Address problem areas: deal with unsuitable, damaged or heavily compressed insulation where required.
- Install the insulation: lay the appropriate insulation system to the required depth and coverage.
- Protect ventilation: maintain appropriate ventilation at the eaves and other ventilation points.
- Check the finish: inspect coverage and leave the work area clean and tidy.
We keep your loft vents clear. The Energy Saving Trust advises against blocking them when fitting insulation, because airflow keeps moisture down in the roof space.
Portsmouth houses and their lofts
Portsmouth has a real mix of housing. There are Victorian and Edwardian terraces in Southsea, Fratton and North End, inter-war and post-war semis further north in Cosham, Drayton and Farlington, and newer homes on the edges of the city. Loft access, roof shape and the insulation already in place can be very different from one street to the next. Being close to the sea also means we pay attention to ventilation and any signs of damp before adding insulation.
That is why a local loft insulation quote should be based on the actual loft rather than a one-size-fits-all price. The amount of insulation required, access, preparation, existing material and any storage requirements can all affect the work involved. If old material needs removing first, Loft Guard also provides loft clearance and waste disposal.
How much does loft insulation cost in Portsmouth?
Our loft insulation prices are typically £16 to £24 per square metre. Where your loft falls in that range depends on the job, and we confirm the exact price after the free survey.
| Job | Typical Loft Guard price |
|---|---|
| Loft insulation (top-up or new install) | £16 to £24 per m² |
| Spray foam removal | Survey needed. See our spray foam removal guide |
Prices last checked October 2026. You only pay when the job is complete and you're 100% happy.
What changes the price: the size of the loft, how much insulation is already there, how easy the hatch and loft are to get into, whether old material has to be removed and taken away, whether you want boarding for storage, and any ventilation or pipe and tank lagging work.
For comparison: the Energy Saving Trust puts typical installation costs in Great Britain at about £750 to go from no insulation to 270mm, and about £600 to top up from 120mm to 270mm. It estimates that the 120mm to 270mm top-up saves around £17 a year on energy bills. (Energy Saving Trust, roof and loft insulation, checked October 2026.)
Book a free survey or call 07407 438065 (freephone 0800 0163210) for a price for your loft.
What our customers say
We are rated 10/10 on Checkatrade from 25 reviews. Read all our reviews on Checkatrade.
Areas we cover around Portsmouth
We work all over Portsmouth and the towns around it. The full list is further down this page. Not sure if we cover your street? Send us your postcode.
Loft insulation in Portsmouth: common questions
How much does loft insulation cost in Portsmouth?
Our loft insulation prices are typically £16 to £24 per square metre. The exact price depends on the size of the loft, what is up there already, access, and whether old insulation has to come out first, and we confirm it after a free survey. For comparison, the Energy Saving Trust puts typical installation costs in Great Britain at about £600 (topping up from 120mm to 270mm) and £750 (from nothing to 270mm).
How thick should loft insulation be?
The Energy Saving Trust recommends at least 270mm of mineral wool for a typical loft. What you need in practice depends on what is already there and how the loft is built.
Can you top up my existing loft insulation?
Often, yes. If the existing insulation is dry and in reasonable condition, we can usually add to it. If it is damp, damaged or badly squashed, it may need to come out first. We will tell you which after the survey.
How long does loft insulation take?
Most standard loft insulation jobs take a day. Jobs that also involve clearing the loft, removing old material or fitting boarding can take longer.
Do you cover Southsea, Cosham and the rest of Portsmouth?
Yes. We work across Portsmouth, including Southsea, Fratton, North End, Copnor, Cosham, Hilsea, Drayton and Farlington, and nearby in Portchester, Havant, Waterlooville, Fareham and Gosport. Send us your postcode if you are not sure.
Will loft insulation lower my energy bills?
It should help. The Energy Saving Trust says an uninsulated home loses around a quarter of its heat through the roof, and estimates that topping up from 120mm to 270mm saves about £17 a year. Your own saving depends on your home and how you heat it.