Roof Insulation Portsmouth
Professional Roof Insulation in Portsmouth
At Loft Insulation Specialists, we help Portsmouth homeowners cut heating bills and stay warmer with professional roof insulation, fitted at rafter level to meet Part L building regulations. With over 40 years of experience across Hampshire, we know the city’s roofs — the heavy Welsh slate of the Victorian terraces in Southsea, Fratton and Cosham, where heat escapes fast through an uninsulated roofline.
Heat rises, and up to 35% of your home’s warmth can be lost through the roof. We insulate between and over the rafters with 300mm Knauf Earthwool or slimline Superfoil to reach a 0.16 W/m²K U-value, keeping habitable lofts and room-in-roof spaces comfortable year-round and trimming around £200–£400 a year off bills.
We handle the full building control process for you, so there is nothing to arrange yourself. Every job starts with a free, no-obligation survey and a fixed-price quote — no high-pressure sales, no jargon, just straightforward advice.
How Portsmouth homeowners benefit from Roof Insulation
At Loft Insulation Specialists, we fit roof insulation, one of the most effective upgrades available, on a Portsmouth home. Heat rises, and without proper insulation at roof level much of the energy you pay for escapes straight through the structure — a real issue in the city’s older slate-roofed terraces and converted lofts. Whether you have a pitched roof, a flat roof, or a mix of both, we insulate between and over the rafters with Knauf Earthwool or Superfoil multifoil to suit the build, targeting a 0.16 W/m²K U-value that meets Part L of the Building Regulations. We will recommend the right material and depth after a proper look at your roof.
Why Portsmouth Homes Need Roof Insulation
An uninsulated or poorly insulated roof can account for a large proportion of heat loss from your Portsmouth home. Installing roof insulation to current standards reduces the amount of energy needed to maintain a comfortable temperature, which directly lowers your heating bills. It also improves the energy performance rating of your property, which can be a factor in property valuations and sales. For Portsmouth homeowners, roof insulation is a practical improvement that delivers ongoing savings.
Knauf Earthwool Mineral Wool Insulation
Knauf Earthwool is a mineral wool insulation product that we install between and over roof rafters. It is fitted to a depth of 300mm to achieve a U-value of 0.16 W/m²K. Earthwool is a proven product with excellent thermal and acoustic performance. It is non-combustible and has a long service life. For Portsmouth properties with sufficient rafter depth or where the roof space is not being used as living space, Earthwool is typically the most cost-effective choice, priced between £900 to £1,200.
Superfoil Reflective Multifoil Insulation
Superfoil is a multifoil insulation product that achieves high thermal performance in a much thinner profile than traditional mineral wool. This makes it particularly suitable for Portsmouth properties where rafter depth is limited or where maximising usable space is important. Superfoil is installed between rafters and provides effective thermal resistance while also acting as a radiant barrier. It is priced between £1,200 and £1,800 for most installations.
Building Regulations and Certification
Roof insulation work in Portsmouth must comply with Part L of the Building Regulations, which sets minimum thermal performance standards. Our installations target a U-value of 0.16 W/m²K, meeting current requirements. We handle the building regulations notification process on your behalf, ensuring that the work is properly recorded. This is important for future property transactions, as evidence of building regulations compliance may be required during the sale process.
Warranties and Long-Term Performance
Both Knauf Earthwool and Superfoil products carry manufacturer warranties, and our installation work comes with a warranty of 10 to 25 years depending on the product and installation type. Properly installed roof insulation will maintain its thermal performance for decades with minimal maintenance. For Portsmouth homeowners, this means long-term energy savings and improved comfort without the need for ongoing attention.
How our Roof Insulation service works in Portsmouth
Take a look below to find out how our Roof Insulation service works in Portsmouth,
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Book your free Portsmouth survey
Roof insulation significantly reduces heat loss through the roof structure, lowering energy bills for Portsmouth homeowners throughout the year.
Improving your roof insulation can raise your property's EPC rating, which is increasingly important for property sales and lettings in Portsmouth.
Both pitched and flat roof insulation options are available, using Knauf Earthwool or Superfoil products to suit the specific requirements of your property.
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Receive your fixed price quote
A survey of your Portsmouth property to assess the current roof insulation condition and recommend the most suitable product and approach.
If you receive qualifying benefits or live in a lower-EPC home, you may be eligible for ECO4 or Great British Insulation Scheme funding — we’ll help you check, and where it applies we carry out the work under those schemes.
Professional installation of your chosen roof insulation product, followed by building regulations notification and warranty documentation.
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Professional Roof Insulation service provided
A warmer, more comfortable home with consistent temperatures and reduced draughts from the roof area.
Lower heating costs from the first winter after installation, with savings that continue for the lifetime of the insulation.
Full compliance with Part L Building Regulations and proper documentation for your records and any future property transactions.
How much does Roof Insulation cost in Portsmouth?
Roof insulation costs in Portsmouth depend on the product and the size of the roof. Superfoil multifoil is typically priced between £1,200 and £1,800, while Knauf Earthwool mineral wool ranges from £900 to £1,200, saving around £200–£400 a year on heating once fitted. The final figure depends on roof type, access, and any preparatory work required.
We provide a fixed quotation after surveying your Portsmouth property, covering materials, installation, building regulations notification, and all documentation. There are no hidden charges — the price we quote is the price you pay.
If you receive certain benefits or qualify under the ECO4 or Great British Insulation Scheme, we’ll help you check your eligibility and can carry out the work under those schemes.
The Portsmouth suburbs we provide Roof Insulation services to:
Anchorage Park, Buckland, Copnor, Cosham, Drayton, Eastney, Farlington, Fratton, Highbury, Hilsea, Landport, Milton, North End, Old Portsmouth, Paulsgrove, Portsea, Somerstown, Southsea, Stamshaw, Tipner, Wymering
Our services in Portsmouth
Roof Insulation Portsmouth Nearby
Why Choose us for Roof Insulation in Portsmouth?
Award-Winning Services
We have been recognised as the 'Best Insulation Installation Firm Hampshire - 2023' by the Southern Enterprise Awards, an independent awarding body.
Guaranteed energy savings
We guarantee up to 35% lower energy bills by slashing heat loss, backed by our free survey, transparent results and full satisfaction pledge.
Proven Accredited Reliability
Checkatrade and Google reviews from Hampshire locals verify our punctuality, spotless sites and top-quality services - independent proof we deliver every time.
True Local Hampshire Experts
Fast same-week surveys and quotes, as well as tailored solutions for local projects mean quicker installs and better results than out-of-area firms.
40+ years of experience
With over 40 years of experience in insulation and home improvements, our team quickly diagnoses issues, gives better advice, and delivers installations done right the first time.
No-obligation surveys
Our surveys are always free with zero obligation. No high-pressure sales or jargon: just straightforward facts and options, respecting your decision every time.
Frequently asked questions
Take a look at the Frequently Asked Questions regarding our Roof Insulation services in Portsmouth.
What types of roof insulation do you install in Portsmouth?
We install Knauf Earthwool mineral wool and Superfoil multifoil insulation. Earthwool is fitted to 300mm depth between and over rafters. Superfoil provides high thermal performance in a thinner profile. The right choice depends on your roof type, available space, and budget.
How much does roof insulation cost in Portsmouth?
Superfoil installations typically cost £1,200 to £1,800, while Knauf Earthwool installations range from £900 to £1,200. We provide a fixed quote after surveying your property.
Do I need building regulations approval for roof insulation?
Roof insulation work needs to be notified under building regulations. We handle this notification on your behalf as part of the installation, ensuring the work is properly documented and compliant with Part L requirements.
What U-value will the insulation achieve?
Our roof insulation installations target a U-value of 0.16 W/m²K, which meets the requirements of Part L of the Building Regulations. This level of thermal performance significantly reduces heat loss through the roof.
Does Portsmouth's coastal climate affect roof insulation performance?
Both Knauf Earthwool and Superfoil perform well in coastal environments. Proper installation ensures that moisture management is maintained within the roof structure. We take Portsmouth’s coastal conditions into account during the survey and installation to ensure long-term performance.
About Portsmouth
Portsmouth
About PortsmouthPortsmouthCity & unitary authority areaPortsmouth Harbour, including Spinnaker TowerThe GuildhallSouthsea BeachHMS VictoryMary Rose MuseumGunwharf QuaysClarence PierFlagCoat of ArmsNickname: PompeyMotto: Heaven’s Light Our GuideShown within HampshirePortsmouthLocation within the United KingdomCoordinates: 50°48′21″N 01°05′14″W / 50.80583°N 1.08722°W Sovereign state United Kingdom Country England Region South East England Ceremonial county Hampshire Government • Type Unitary authority, city • Governing body Portsmouth City Council • Leadership Leader and Cabinet (No overall council control) • Lord Mayor Gerald Vernon-Jackson • Members of Parliament Stephen Morgan (L)
Amanda Martin (L)[2]Area • City & unitary authority area15.54 sq mi (40.25 km2) Population (2011, 2021)• City & unitary authority area208,100[1][a] • Urban 238,137[4][c] • Metro 855,679 (South Hampshire)[3][b] Ethnicity (2021) [5]• Ethnic groups List- 85.2% White
- 6.9% Asian
- 3.4% Black
- 2.6% Mixed
- 1.8% other
Religion (2021) [5]• Religion List- 47.1% no religion
- 39.4% Christianity
- 6.4% not stated
- 4.9% Islam
- 0.8% Hinduism
- 0.6% other
- 0.5% Buddhism
- 0.2% Sikhism
- 0.1% Judaism
Time zone UTC+0 (GMT) • Summer (DST) UTC+1 (BST) Postal code POArea code 023 ISO 3166 code GB-POR Police Hampshire and Isle of Wight Ambulance South Central Fire Hampshire and Isle of Wight Website portsmouth .gov .uk Portsmouth (/ˈpɔːrtsməθ/ ⓘ PORTS-məth) is a port city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in England not located primarily on the mainland. The city is located 22 miles (35 km) south-east of Southampton, 50 miles (80 km) west of Brighton and Hove and 74 miles (119 km) south-west of London. With a population last recorded at 208,100, it is the most densely populated city in the United Kingdom. Portsmouth forms part of the South Hampshire urban area with Gosport, Fareham, Havant, Eastleigh and Southampton.
Portsmouth’s history can be traced to Roman times and it has contained a significant Royal Navy dockyard and base for centuries. Portsmouth was founded c. 1180 by Anglo-Norman merchant Jean de Gisors in the south-west area of Portsea Island, a location now known as Old Portsmouth. Around this time, de Gisors ordered the construction of a chapel dedicated to St Thomas Becket. This became a parish church by the 14th century. Portsmouth was established as a town with a royal charter on 2 May 1194. The city is home to the first drydock ever built. It was constructed by Henry VII in 1496.
Portsmouth has the world’s oldest dry dock, “The Great Stone Dock”; originally built in 1698, rebuilt in 1769 and presently known as “No.5 Dock”. The world’s first mass production line was established at the naval base’s Block Mills which produced pulley blocks for the Royal Navy fleet. By the early-19th century, Portsmouth was the most heavily fortified city in the world, and was considered “the world’s greatest naval port” at the height of the British Empire throughout Pax Britannica. By 1859, a ring of defensive land and sea forts, known as the Palmerston Forts, had been built around Portsmouth in anticipation of an invasion from continental Europe.
In the 20th century, Portsmouth achieved city status on 21 April 1926. During the Second World War, the city was bombed extensively in the Portsmouth Blitz, which resulted in the deaths of 930 people, and it was a pivotal embarkation point for the D-Day landings. In 1982, a large Royal Navy task force departed from Portsmouth for the Falklands War. Her Majesty’s Yacht Britannia was formerly based in Portsmouth and oversaw the transfer of Hong Kong in 1997, after which Britannia was retired from royal service, decommissioned and relocated to Leith as a museum ship.
Featured Business LocationLoft Insulation Specialists near Portsmouth
general contractor, manufacturer, service
5 stars (8 reviews)Phone: 023 9326 7900Nearby Suburbs