Marketing for insulation & retrofit

The economics that should drive the budget

Prices span two orders of magnitude, which is why averages mislead here. A loft top-up privately paid is £400 to £900. Cavity fill on a standard semi runs £500 to £1,500, and extracting failed cavity fill costs about the same again before anything is put back. Underfloor insulation lands between £2,000 and £5,000 depending on access. Internal wall insulation on a solid-walled terrace is £5,000 to £12,000 once making good is included. External wall insulation with a render finish, the flagship measure of this trade, sits at £8,000 to £22,000 on a typical semi-detached property.

Margin follows the funding route. Scheme-delivered measures are priced against a published rate and run on volume and efficiency, frequently in the teens once the assessment, coordination and lodgement costs are absorbed. Private solid wall work carries twenty-five to thirty-five per cent because you set the price and the customer is buying appearance as much as thermal performance. Close rates diverge just as sharply. Funded enquiries convert badly because most fail eligibility, sometimes only one in eight reaching an installed measure. Private external wall enquiries close nearer one in three across a six to twelve week decision.

Take the private side, since that is what advertising should target. A £13,000 job at thirty per cent leaves roughly £3,900 of gross profit, and one close in three puts about £1,300 of expected value behind each real enquiry. That supports a cost per enquiry of £120 to £260 without discomfort, which is a figure that would horrify a loft insulation operator and is exactly why the two must not share a budget. Judging this account at thirty days is meaningless; the decision regularly outlives the reporting month.

Seasonality

Enquiries here are driven by bills and by news, not by temperature alone. The first genuine cold snap of autumn lifts volume within a week, energy price announcements move it within days, and January is reliably the busiest enquiry month of the year because the previous quarter’s heating bill has just landed. Any government announcement about funding produces a spike of mixed quality, heavy on people hoping the work is free.

The awkward part is that installation runs on the opposite cycle. Render systems need dry conditions and temperatures holding above about five degrees, so the practical external wall season is spring to autumn. That mismatch is a scheduling advantage rather than a problem: sell hard from October to February into a spring and summer diary, be honest that the scaffold goes up in April, and use the deposit and survey stage to hold the customer through winter. Firms that stop advertising in January because they cannot install in January give away their entire following season.

What the buyer is actually checking

The private retrofit buyer is nervous for a specific and well-earned reason: they have read about cavity insulation causing damp, about render cracking, and about firms that installed under a scheme and then vanished. Before contacting you they are checking how long the company has traded, who backs the guarantee and whether that guarantee survives your insolvency, and what happens to ventilation once the house is sealed up. A page that discusses condensation risk honestly, rather than pretending insulation has no consequences, does more for conversion than photographs of finished elevations.

They also want to see the boring detail. How the render meets the window reveals, what happens at the eaves and the damp proof course, whether gas meters and downpipes are moved and by whom, and how long the property will be under scaffold. Landlords ask a shorter list and a harder one: which measure lifts the EPC band for the least money, how fast, and whether you will handle the lodgement. Everyone in this market is comparing three quotes and the cheapest is frequently discounted immediately, because in this trade a suspiciously low price reads as a warning rather than a bargain.

Which channel wins here

Search does the qualifying work, provided the negatives are brutal. Someone typing external wall insulation cost is a buyer; someone typing free insulation grant is almost never one, and the gap between those two searches is where most insulation budgets die. Because the private ticket is large, this is one of the few trades on the site where a considered, slower campaign with a lower volume of expensive clicks beats a broad one.

Organic content is unusually powerful here and undersupplied. The questions people ask before spending five figures on a fabric measure are technical and repetitive, so pages on condensation risk, on what a retrofit assessment actually involves, on insulating a solid wall from inside versus outside, and on what does and does not move an EPC band will rank and stay ranked. Meta works better than it does for most trades because the finished result is visually dramatic, but it works for reach and retargeting rather than direct enquiry. Route paid social to a survey booking page carrying a plain eligibility question about tenure and wall construction, or you will drown in instant form fills from people who wanted the government to pay.