Solid brick Victorian and Edwardian terraces need insulation specified for their wall type, not a generic system borrowed from cavity-wall housing. Lian Construction runs fabric-first retrofits here — external or internal wall insulation, loft and floor upgrades, ventilation and secondary glazing — sequenced to protect the EPC gain without trapping moisture in the brick.
Ealing overview
Eco Retrofit Refurbishment in Ealing
West London borough benefiting from Wembley-area regeneration, with consistent buy-to-let refurbishment activity. Ealing falls well within the West London ground Lian Construction covers on a regular basis. For fabric-first eco retrofit and solid wall insulation for Victorian and Edwardian terraces in Ealing, that local knowledge means fewer surprises once work is on site and a team that already understands the borough's typical property stock.
Ealing's housing stock reflects its position as an established West London suburb that grew steadily through the Victorian and Edwardian periods before filling out further between the wars. Expect a mix of Victorian and Edwardian terraces and semi-detached houses, along with a good number of 1920s and 1930s bay-fronted semis typical of outer London's interwar expansion. Purpose-built mansion blocks and low-rise flats sit alongside the houses in many areas, and more recent infill development has added flats and townhouses on smaller sites over the decades. Properties of this age generally come with the usual list of refurbishment needs: ageing roofs, single-glazed or early double-glazed windows, dated wiring and plumbing, and layouts that often don't suit modern living without some reconfiguration. Loft conversions and rear or side extensions are common ways owners add space rather than move. As with much of outer London, condition varies a lot street to street depending on when a property last had significant work done, which is worth bearing in mind when planning a refurbishment budget or scope.
Regeneration activity around the Wembley area has had a knock-on effect on demand in neighbouring parts of West London, including Ealing, as buyers and renters look slightly further out for value while still wanting reasonable access to improving transport and amenities. This tends to support steady interest in rental property, and landlords in the borough have kept up a fairly consistent pace of refurbishment work, whether that's turning round properties between tenancies, upgrading kitchens and bathrooms to hold rents at a competitive level, or bringing older stock up to current standards for letting. For homeowners, the same regeneration effect can make extending or improving an existing property more attractive than moving, particularly where nearby development is pushing up expectations for finish quality. Because Ealing sees this kind of ongoing buy-to-let and owner-occupier refurbishment demand, competition among contractors for smaller and mid-sized jobs can be steady rather than sparse, so landlords and homeowners are often weighing up contractors on reliability and turnaround time as much as price. Getting quotes early and being clear about scope tends to help avoid delays, especially for landlords working to a fixed window between tenants.
Typical eco retrofit refurbishment prices in London
Internal wall insulation (full house, plus £200-£500/room)
£5,500–£8,500
Loft insulation top-up
£400–£1,200
Secondary glazing (per window)
£350–£600
General London market guidance, not a fixed quote — actual pricing depends on a site survey. Full breakdown: cost guide.
Building Regulations, Planning and Party Wall Consents
Any wall, roof or floor insulation upgrade sits under Building Regulations Approved Document L (Conservation of Fuel and Power), which sets the energy performance standard the finished work has to meet for existing dwellings - broadly the 0.30 W/m²K wall, 0.16 W/m²K roof and 0.25 W/m²K floor backstop U-values referred to earlier - and Approved Document F (Ventilation) runs alongside it because reducing air leakage without providing controlled ventilation - trickle vents, extract fans or whole-house ventilation - is a recognised cause of condensation and mould. External wall insulation is normally permitted development, provided the finish matches the existing exterior in appearance, but this right is commonly removed or restricted in conservation areas and on listed buildings, which cover large parts of London's Victorian and Edwardian terraced streets, so a planning application is often needed before external insulation or render changes can go ahead - we check your specific address against the local planning authority's conservation area map and any Article 4 direction before recommending a route, and where the permitted development position is genuinely unclear, applying for a Certificate of Lawfulness (a formal council determination, typically an eight-week process) can settle the point before scaffolding is booked rather than after. A party wall notice for external wall insulation is required wherever the render or fixings will sit over or against a wall shared with a neighbouring terrace or semi, under the Party Wall etc. Act 1996, and adjoining owners need one to two months' notice before scaffolding or fixings go up - alongside the notice, we'd recommend a written schedule of condition with dated photographs of the shared wall, so there's a clear record of its state before and after the work if a dispute ever arises. Skipping the notice altogether is a genuinely common and avoidable cause of disputes on terraced insulation jobs. For anything structural bundled into the retrofit, chimney breast removal or an enlarged opening, a structural engineer's calculations and a full plans Building Control submission are needed rather than the simpler building notice route used for straightforward fabric-only upgrades.
The Ventilation and Condensation Mistakes We See Most
The single most common problem we get called out to fix on other people's retrofit work is interstitial condensation: internal wall insulation fitted with a non-breathable foil-backed board or without a correctly detailed vapour control layer traps moisture between the insulation and the cold brick, and it surfaces as damp patches or mould at skirting and window reveals months after the job was signed off and paid for. A close second is cold bridging at floor-to-wall junctions and around chimney breasts, where insulating the wall or floor in isolation, without detailing where the two measures meet, leaves a ring of localised condensation exactly at that junction. Sealing up original air bricks, chimney flues or trickle vents as part of draught-proofing, without replacing that ventilation another way, is the third recurring issue, and it turns a previously dry flat or terrace stuffy and prone to mould within a season. Approved Document F sets out specific extract rates for exactly this reason - typically 13 litres per second intermittent extract for a kitchen and 8 litres per second continuous, or the bathroom equivalent of 15 litres per second intermittent - and a quote that's silent on ventilation, or that doesn't reference sizing the extract to the room, is missing a requirement Building Regulations treat as inseparable from wall and roof insulation. A less obvious mistake: adding external wall insulation and render without checking where the new build-up sits relative to the existing damp-proof course can raise the external ground or render level above the DPC line, letting rising damp back into a wall that had been dry for decades. Ex-council flats built with non-traditional construction need different mechanical fixings again, and any structural movement joints in the original panel construction have to be respected rather than insulated straight over.
Fabric-first sequencing: loft and roof first, then walls, floor and openings, heating sized and fitted lastBreathable wood-fibre or mineral wool systems specified on solid brick walls, not foil-backed PIR board that traps moistureVentilation designed and sized alongside every insulation measure so draught-proofing doesn't create the mould it was meant to preventRegular coverage of Ealing and the wider West London area
Signs to look for
Do you need eco retrofit refurbishment in Ealing?
An ex-council flat or maisonette of non-traditional construction, large-panel system or concrete cross-wall, where a standard insulation quote hasn't accounted for the different fixing requirements
Rooms that stay noticeably cold even with the heating on, particularly against external solid brick walls facing the street or a side return
A heating bill that has crept up year on year with no change in usage, often a sign a solid wall or un-insulated suspended floor is losing heat faster than the boiler can replace it
Condensation or mould appearing at skirting boards, window reveals, or around chimney breasts, especially after previous DIY insulation or draught-proofing work
How the work is handled in Ealing
Step 1Initial survey of the existing wall, roof, floor and glazing construction, including a baseline moisture reading and a check of the brick bond to confirm solid or cavity wall type, plus a review of the current EPC and any existing ventilation issues
Step 2Fabric-first sequence agreed with you in writing against target U-values from Approved Document L: loft and airtightness first, then walls, then floor, then windows and doors, with heating addressed last so it's sized to the improved building
Step 3Planning position checked against conservation area status and permitted development rights, with a planning application or a Certificate of Lawfulness submitted where the position isn't clear-cut
Step 4Party Wall Act notices served on adjoining owners one to two months before work starts, backed by a written schedule of condition with dated photographs of the shared wall, wherever insulation or render will be fixed over or against a boundary wall
Step 5Building Control route agreed - full plans submission where structural work or consequential energy-performance compliance is involved, building notice for straightforward fabric-only upgrades - with CDM 2015 duties allocated where more than one contractor will be on site
Step 6Structural engineer input obtained where load-bearing elements are affected, such as chimney breast removal or an enlarged opening, with calculations submitted to Building Control before work starts
Step 7Wall insulation installed with the material and fixings matched to the wall type - breathable wood-fibre or mineral wool for solid brick, mechanical fixings suited to concrete panel construction on system-built flats - and checked against the system's BBA certificate
Step 8Floor and roof insulation fitted with junctions detailed so there's no cold-bridging gap where a newly insulated wall meets an un-insulated floor or chimney breast, with each stage inspected and photographed before it's boarded or rendered over
Step 9Ventilation - trickle vents, extract fans or whole-house ventilation - sized to Approved Document F extract rates and commissioned and flow-tested before handover, rather than left as an afterthought
Step 10Snagging agreed, Building Control completion certificate obtained, and a handover pack issued with product data sheets, BBA certificates and warranty documents, plus as-built U-values passed to any separately MCS-accredited installer taking on a heat pump or grant-linked measure
Questions
Eco Retrofit Refurbishment questions in Ealing
How quickly can Lian start fabric-first eco retrofit and solid wall insulation for Victorian and Edwardian terraces in Ealing?
Ealing is part of our regular West London coverage, so once we've surveyed the property we can usually confirm a start date quickly. Send the address and scope and we'll arrange the next step.
Do you cover all of Ealing?
Yes. Ealing falls within the area Lian Construction serves across Greater London.
Do you work on both owner-occupied homes and rental properties in Ealing?
Yes, we take on both. The main practical difference is usually the timeline and how much the property needs to stay liveable or lettable during the work, which we'd talk through with you before starting so expectations on access and disruption are clear from the outset.
Why recommend insulation before a heat pump, when the heat pump is what heats the house?
Because a heat pump's efficiency, its coefficient of performance, is heavily dependent on how well the building retains heat once the heat pump has put it in. A heat pump on a fabric-first-retrofitted house can typically run at a seasonal coefficient of performance in the region of 3 to 4, whereas the same unit fighting constant heat loss through an un-insulated solid-wall Victorian terrace often has to run at a higher flow temperature just to keep up, dragging that figure down toward 2 to 2.5 and showing up directly as a higher electricity bill. Doing the walls, roof, floor and windows first means whatever heating system goes in afterward is sized correctly and performs as intended.
How much does a full retrofit cost for a typical London terrace?
For a Victorian or Edwardian mid-terrace, external wall insulation runs roughly £6,000-£10,000, internal wall insulation £5,500-£8,500 plus £200-£500 per room for radiator and skirting work, loft top-ups £400-£1,200, suspended floor insulation £1,400-£2,500, and secondary glazing to 8-10 windows £3,000-£6,000. Combining one wall-insulation route with loft, floor and secondary glazing typically totals £11,000-£20,000 for a mid-terrace, rising to roughly £19,000-£30,000 on a semi-detached property taking the external wall insulation route, since that's the largest line item and it scales with the extra elevation area.
How much does loft insulation cost in London?
A loft insulation top-up or first-time install to the current recommended depth of 270mm - up from the 100mm or less common in older installs - typically costs £400-£1,200 for a standard London semi or terrace, with the range depending on existing depth, joist condition, and whether boarding or a loft hatch upgrade is included. It's usually the cheapest and quickest fabric measure per EPC point gained, which is why we normally sequence it first in a wider retrofit.
Talk to Lian Construction about Ealing
Send the site address in Ealing, photos if available, and the eco retrofit refurbishment work you need. We can review the scope and arrange the next step.