Loft Insulation Portsmouth
Loft insulation for Portsmouth homeowners
At Loft Insulation Specialists, we help Portsmouth homeowners cut heating bills with loft insulation installed to 300mm of Knauf Earthwool or Superfoil. Terraced and townhouse properties account for 43.4% of the city’s housing, and many of the terraces in Southsea and Fratton are Victorian. The Victorian terraces have solid masonry walls and a narrow pitched loft beneath a heavy slate roof, with no insulation from the original construction. The council housing at Landport, Somerstown and Buckland dates from the 1960s-70s redevelopment and usually has cavity-wall construction.
Up to 35% of a home’s heat escapes through an uninsulated roof. A free, no-obligation survey measures what your loft holds now, and you receive a fixed-price quotation before you book any work.
How Portsmouth homeowners benefit from Loft Insulation
Every Portsmouth loft insulation survey settles the same three decisions: whether the existing insulation stays, which material we install, and what happens to anything stored up there. The first decision matters most for the Victorian terraces of Southsea and Fratton. Victorian builders fitted no loft insulation, and we measure the depth of any mineral wool installed since. The sections below explain each decision.
Keep the quilt that is there, or start again
Dry mineral wool insulation that lies flat and springs back when pressed stays in position, and we lay new Knauf Earthwool over it to reach 300mm. Damp, stained or compressed insulation comes out first, because fibres in that condition never recover their original thickness. The survey settles which applies to your property, and the quotation states it.
Knauf Earthwool or Superfoil
Knauf Earthwool is the standard material: mineral wool insulation laid between and then across the joists to a 300mm depth, with a 40+ year service life. Superfoil is the multifoil alternative for a property with shallow joists or a floor you want to keep usable, because it delivers the same thermal performance in around one-fifth of the thickness. Most properties take Earthwool, and the survey confirms which material suits yours.
Boxes, boards and the hatch
Boxes placed directly on the insulation compress it, and boards screwed directly onto the joists over 100mm of mineral wool compress it equally. We move stored items aside on the installation day, and where you want to keep the storage, raised loft boarding on stilted legs sits above the full 300mm of insulation. We insulate and draught-strip the hatch surround as part of every installation.
Common loft insulation issues in Portsmouth homes
Victorian terraces in Southsea and Fratton account for the largest proportion of Portsmouth lofts. Their solid masonry walls carry a narrow pitched roof void beneath heavy slate. Any mineral wool insulation in the void postdates construction, and we measure its depth at the survey and check that it continues to the eaves. Converted flats in Southsea generally have no individual accessible loft. The 1960s-70s council housing at Landport, Somerstown and Buckland usually has cavity-wall construction. Mineral wool insulation installed in the 1960s-70s has usually settled below 100mm, and a dry layer takes a top-up of Knauf Earthwool insulation to 300mm.
Why Portsmouth homeowners choose Loft Insulation Specialists
With 40+ years of experience in insulation across Hampshire, we have insulated lofts on Portsmouth’s Victorian terraces and its post-war housing estates alike. We were named ‘Best Loft Insulation Installation Firm 2023 – Hampshire’ by the Southern Enterprise Awards, and every job starts with a free, no-obligation survey and a fixed-price quote. No high-pressure sales or jargon.
How our Loft Insulation service works in Portsmouth
Take a look below to find out how our Loft Insulation service works in Portsmouth,
- 1
Book your free Portsmouth survey
Book a free, no-obligation survey and we visit your Portsmouth property the same week to measure the existing insulation.
We measure the insulation depth between the joists, press the material for compression and check the eaves ventilation for airflow and staining.
We photograph the condition of the loft and confirm whether a top-up or a complete replacement is the better value.
- 2
Receive your fixed price quote
We calculate your fixed-price quotation from the loft floor area, the access and the survey findings, naming Knauf Earthwool or Superfoil as the material.
If you receive certain benefits and your EPC rating is D-G, we'll help you check ECO4 eligibility and carry out a funded installation under the scheme.
We set out labour, materials, disposal of any old insulation and the completion time in writing before you book the installation.
- 3
Professional Loft Insulation service provided
A standard Portsmouth loft installation takes 4–6 hours with a two-person crew, and we bring our own ladders and equipment.
We lay protective sheeting across the landing and staircase before the installation begins, and we contain the dust at the hatch opening.
Before we leave you inspect the finished depth with us, the eaves ventilation left clear and any old insulation bagged for licensed disposal.
How much does Loft Insulation cost in Portsmouth?
Loft insulation in Portsmouth costs between £600–£1,500 for a typical three-bedroom semi-detached home, or £15–£22 per square metre including materials and labour. Clearing old material with licensed disposal adds £650 where the survey identifies it.
A top-up installation over dry mineral wool on a 1960s-70s council property at Landport, Somerstown or Buckland usually sits towards the lower end. A Victorian terrace in Southsea or Fratton costs nearer the upper end where the void contains no insulation and the installation starts from exposed joists. A restricted hatch opening or boarding fixed to the joists adds labour, and the quotation itemises it. We confirm the price after the survey, and we add nothing afterwards.
The Portsmouth suburbs we provide Loft 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
Loft Insulation Portsmouth Nearby
Why Choose us for Loft 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 Loft Insulation services in Portsmouth.
Can a grant pay for loft insulation in Portsmouth?
Possibly. ECO4 funding is still available but in its final stage, and the programme winds down completely on 31 December 2026. It applies if you receive certain benefits and your home’s EPC rating is D-G. In Portsmouth the Victorian terraces of Southsea and Fratton are most likely to hold under 100mm. Any mineral wool insulation in them postdates the original construction. Mineral wool on the 1960s-70s council housing at Landport and Buckland has usually settled below 100mm. We’ll help you check your eligibility at the survey and carry out a funded install under the scheme.
Which Portsmouth homes gain most from new loft insulation?
Victorian terraces in Southsea and Fratton are the Portsmouth properties with the most to gain from new loft insulation. Their solid masonry walls rule out cavity insulation. Installing 300mm of Knauf Earthwool where the original construction had none makes the largest difference to the heating bill. The 1960s-70s council properties at Landport, Somerstown and Buckland gain nearly as much. Their mineral wool insulation has usually settled below 100mm, and a top-up installation restores the depth. Private renting covers 28.6% of the city’s properties, and the landlord arranges the survey and quotation for a tenanted terrace.
Do I need to empty my Portsmouth loft before you arrive?
No, not completely. We move boxes and furniture on the loft floor aside on the installation day, because the insulation runs across every joist bay. Anything on a raised boarded platform stays in position throughout the installation. Tell us at the survey what is stored up there, and the quotation allows for moving it.
What do you do with old loft insulation from Portsmouth homes?
We bag damp, stained or compressed insulation in the loft and transport it to a licensed disposal facility. We never reuse it, because wet mineral wool does not recover its thickness once dried. Dry insulation in good condition stays in position, and we install the new material over it. Removal adds 2–4 hours to the installation, and the quotation states it before the day.
How do I arrange a loft insulation survey in Portsmouth?
Request a quotation through the contact form or on 023 9326 7900, and we arrange a free, no-obligation survey the same week. The fixed-price quotation follows in writing. We cover Portsmouth and the surrounding area, and our Portsmouth service area page lists the neighbourhoods we cover for insulation work. Boarding and stored possessions cover the joists we measure between, and we ask at booking whether the loft contains either.
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