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Duct cleaning - buying well
Ask several contractors to quote for cleaning your ductwork and the prices can come back strikingly different - which is confusing when you asked them all the same thing. But the wide variation usually reflects real differences: in what the quotes cover, how they access the system, and the condition and layout of the ductwork itself. Here is why duct cleaning quotes vary so widely, and how to compare them fairly.
The short answer
Duct cleaning quotes vary widely because cleaning ductwork is not one standard job but a job whose extent, difficulty and thoroughness can differ enormously - so the same request (clean my ductwork) can be quoted as very different pieces of work. The first source of variation is scope: one quote may cover cleaning the whole system, end to end, including the hidden and awkward sections, while another covers only the easily reachable parts - and these are genuinely different amounts of work, so they price differently. The second is access: reaching the whole of a duct run needs access, either using the access panels already fitted or cutting and fitting new ones where the ductwork is sealed, and a quote that includes providing access is doing more (and pricing more) than one that cleans only what it can reach without any. The third is the system itself: ductwork varies in length, layout, complexity, condition and grease load, so cleaning a long, complex, heavily fouled system is a bigger job than cleaning a short, simple, lightly soiled one - and quotes reflect that, or should. The fourth is what comes with the clean: whether it includes a proper standard of cleaning with a post-clean report and certification, or just a basic clean with nothing documented. So a wide spread of quotes usually reflects real differences in the job being priced - not one fair price and several wrong ones, but different jobs at different prices. The implication for comparing them is important: you cannot compare duct cleaning quotes on price alone, because a lower price often means a narrower job (less scope, no access, no certification), not the same job cheaper. To compare fairly, you have to compare what each quote actually covers - the scope, the access, the standard and the deliverables - so you are comparing like for like. Once you do, the wide variation usually resolves into a clear picture of who is quoting for the whole job and who for part of it.
Key points
Not one standard job
The root of the wide variation is that clean my ductwork is not a single, standardised job but a request that can be met by very different pieces of work. Two contractors can both agree to clean your ductwork and mean quite different things by it - one a thorough clean of the whole system to a recognised standard with documentation, the other a basic clean of the accessible parts with nothing recorded. Because the words of the request are the same but the work they intend differs, the quotes differ, sometimes widely. So the variation is not usually contractors pricing the same job differently for no reason; it is contractors pricing different jobs, all nominally answering the same request. Understanding this is the key to making sense of a confusing spread of quotes: the spread reflects differences in the work, not just in the pricing.
This is why a naive comparison - picking the cheapest because they are all quoting for the same thing - goes wrong. They are usually not quoting for the same thing, even though they are answering the same request, so the cheapest is often the one doing the least, not the one doing the same for less. The wide variation is a signal that the quotes need reading carefully to see what each actually covers, rather than lined up on price. The good news is that once you read them for their content - what scope, what access, what standard, what deliverables - the variation usually becomes explicable: the higher quotes are typically doing more (whole system, access, certification) and the lower ones less. So the wide spread is informative rather than random, if you read it. The sections below set out the specific differences that drive the variation, so you can see what to look for in each quote and compare them on the work rather than the price.
Scope and access
The biggest driver of variation is scope - how much of the system the quote covers. A duct system has easily reachable parts and hidden, awkward parts (long runs, vertical risers, sections behind equipment), and a quote can cover all of it or only some. A quote to clean the whole system, end to end, is a bigger job than one that cleans only the accessible parts, so it prices higher - and the difference can be large, because the hidden parts are often the hardest to reach and clean. So a low quote and a high quote can differ mainly because the low one is cleaning part of the system and the high one all of it. This matters because the hidden parts are usually the ones that most need cleaning (where grease and dirt build up unseen), so a quote that skips them is cheaper but leaves the most important cleaning undone. Scope is the first thing to compare, because it is where the biggest differences in work, and price, usually lie.
Closely tied to scope is access. Cleaning the whole of a duct run means reaching all of it, which requires access - using the access panels already fitted, or cutting and fitting new ones where the ductwork is sealed. A quote that includes providing the access needed to reach the whole system is doing more than one that cleans only what it can reach through existing openings, and prices accordingly. So two quotes can differ because one has priced in the access to clean the sealed sections and the other has not - meaning the cheaper one will clean less, stopping wherever the ductwork closes up. Access is often invisible in a headline price but makes a real difference to how much of the system gets cleaned, so it is worth checking whether each quote includes it. Together, scope and access explain much of the variation: a quote covering the whole system with proper access is a substantially bigger job than one cleaning the reachable parts, and the price gap between them reflects that real difference in work.
The system and the standard
Two more factors drive the variation. The first is the system itself - its length, layout, complexity, condition and grease load. A long, complex duct system with many runs and heavy grease fouling is a bigger, harder job to clean than a short, simple, lightly soiled one, so it costs more to clean properly - and quotes should reflect the actual system, which means a contractor who has assessed your ductwork can quote it accurately, while one quoting blind may be guessing. This is part of why quotes vary: the system's real characteristics affect the work, and contractors who have properly gauged them quote differently from those who have not. It is also why a contractor asking to see the ductwork before quoting is a good sign - they are pricing the actual job rather than a generic one. So variation can reflect how well each contractor has understood the specific system they are quoting for.
The second is the standard and the deliverables - what the clean actually amounts to and what comes with it. A quote may include cleaning to a recognised standard (TR19 Grease for a kitchen extract) with a post-clean report, before and after photographs, and certification - or it may be a basic clean with nothing documented. The former is more work and produces the evidence your insurer and fire risk assessment rely on; the latter is cheaper but leaves you with no proof the job was done to standard. So two quotes can differ because one includes the standard and the documentation and the other does not - a real difference in what you get, not just in price. When comparing quotes, the standard and deliverables matter as much as the cleaning itself, because a clean with no certification may not satisfy your compliance needs however cheap it is. So the system's characteristics and the standard-plus-deliverables are the other main sources of variation, alongside scope and access - and all four have to be compared to understand why the quotes differ and which represents the job you actually need.
How to compare fairly
Given all these sources of variation, the way to compare duct cleaning quotes fairly is to compare what each actually covers, not the headline price - because the price differences usually reflect differences in the work, so comparing prices alone compares different jobs. The things to line up across the quotes are: the scope (does it cover the whole system or only the reachable parts?), the access (does it include providing access to the sealed sections?), the standard (does it clean to a recognised standard?), and the deliverables (does it include a post-clean report and certification?). Comparing these puts the quotes on a like-for-like footing, so you can see which are quoting for the whole, proper job and which for a partial one - and then the price differences make sense, because you can see what each price buys.
Done this way, the wide variation usually resolves into a clear picture. The higher quotes typically cover the whole system, with access, to a standard, with certification - the complete job. The lower quotes typically cover less - part of the system, no access, no certification - which is why they are cheaper. Seeing this, you can choose on the basis of the job you need rather than the price alone: if you need the whole system cleaned to standard with proof (which, for a kitchen extract, you usually do for insurance and fire safety), the complete quotes are the relevant ones, and the cheap partial ones are not really offering what you need however low their price. So comparing fairly turns a confusing spread of prices into an informed choice, by reading each quote for its content and comparing like with like. The variation is not a reason to despair of comparing; it is a reason to compare on the work rather than the price - which is the only way to compare duct cleaning quotes meaningfully.
The takeaway
Duct cleaning quotes vary widely because cleaning ductwork is not one standard job: the same request can be met by very different pieces of work, so the quotes price different jobs. The variation comes from real differences - the scope (whole system or just the reachable parts), the access (providing access to sealed sections, or not), the system itself (length, layout, complexity, condition and grease load), and the standard and deliverables (cleaning to a recognised standard with a report and certification, or a basic clean with nothing documented). Each of these changes how much work the quote represents, so quotes covering more come in higher and quotes covering less come in lower.
The implication is that you cannot compare duct cleaning quotes on price alone, because a lower price usually means a narrower job, not the same job cheaper. To compare fairly, compare what each quote actually covers - scope, access, standard and deliverables - so you are comparing like for like. Done that way, the wide variation resolves into a clear picture of who is quoting for the whole, proper job and who for part of it, and you can choose on the basis of the job you need. For a kitchen extract, that job usually includes the whole system, cleaned to standard, with certification for insurance and fire safety - so the complete quotes are the relevant ones. The wide spread of prices is not random; it reflects different jobs, and reading the quotes for their content is how you make sense of it.
Questions
Because they are usually not quoting for the same job, even though you asked them the same thing. Cleaning ductwork is not one standard piece of work: the quotes can differ in scope (whole system or just the reachable parts), access (whether they provide access to sealed sections), the system's own characteristics (length, layout, condition, grease load), and the standard and deliverables (cleaning to a recognised standard with a report and certification, or a basic clean with nothing documented). Each of these changes how much work the quote represents. So the wide variation reflects different jobs being priced, not one job priced inconsistently - which is why comparing them requires reading what each actually covers, not just the prices.
Not necessarily worse, but usually narrower - a cheaper quote most often means less work, not the same work for less. The lower price typically comes from covering less: part of the system rather than all of it, no access to the sealed sections, no cleaning to a certified standard, no documentation. So the cheaper contractor may be perfectly competent but quoting a smaller job. The risk is assuming the cheap quote is the same job at a lower price when it is really a partial job - which leaves the hidden, most-fouled parts uncleaned and gives you no certification. So read a cheap quote for what it covers rather than assuming it is a bargain; sometimes it is genuinely efficient, but often it is cheaper because it does less.
Because reaching the whole of a duct system often requires providing access - using existing access panels where they exist, or cutting and fitting new ones where the ductwork is sealed - and that is real work that takes time and skill. A quote that includes the access needed to clean the whole system is doing more than one that cleans only what it can reach through existing openings, so it prices higher. The difference matters because without the access, the sealed sections (often the dirtiest) do not get cleaned - so the cheaper, no-access quote cleans less. Access is often invisible in a headline price, which is why it is worth checking whether each quote includes it: it directly affects how much of the system will actually be cleaned.
No - that risks paying for a partial job that leaves your real problem uncleaned and unproven. The cheapest quote is often the one covering the least: part of the system, no access, no certification. If you need the whole system cleaned to standard with documentation - which, for a kitchen extract, you usually do for insurance and fire safety - the cheapest quote may not offer that at all, so its low price is buying the wrong thing. Rather than picking on price and hoping, compare the quotes on what they cover (scope, access, standard, deliverables) and choose the one that matches the job you actually need. The cheapest is only the right choice if it genuinely covers that job; often it does not, and choosing it means having to redo the work properly later.
Compare what each quote actually covers, not the headline price, because the price differences usually reflect differences in the work. Line up across the quotes: the scope (whole system or just the reachable parts), the access (does it include providing access to sealed sections?), the standard (does it clean to a recognised standard like TR19 Grease?), and the deliverables (does it include a post-clean report and certification?). Putting these side by side makes the quotes like-for-like, so you can see which are quoting for the complete job and which for a partial one - and then the prices make sense against what each buys. This turns a confusing spread of prices into an informed choice based on the job you need, rather than a gamble on the lowest number.
Because the system's own characteristics - its length, layout, complexity, condition and grease load - strongly affect how much work cleaning it properly involves, and a contractor can only quote that accurately by seeing it. A contractor who quotes blind is guessing at the system and may price too high, too low, or for a generic job that does not match yours; one who inspects the ductwork first can quote for the actual system and the actual work. So a contractor asking to see the ductwork before quoting is a good sign - they are pricing the real job rather than a notional one. It also means their quote is more likely to be firm and to reflect what the clean will really involve, which makes it more reliable to compare and to rely on.
We quote the whole system, the access, the standard and the certification, so you can see exactly what you are buying and compare it fairly. Ask us to see your ductwork and quote the complete job.
