One price for supply and fit, or the parts plus a fitter?

Buying the parts yourself and hiring a fitter sounds like it should save the VAT. On VAT alone it usually saves nothing, because most UK work on an existing house is standard-rated anyway; one exception is certain specified energy-saving materials, installed. Unbundling moves liability for the goods onto you, and what decides the tax is the rate the work carries.

The rate belongs to the work, not to the invoice line

In a bundled price the materials carry the VAT rate of the labour. HMRC states the rule directly: “Builders charge VAT on building materials that they supply and incorporate in a building (or its site) at the same rate as for their work. Therefore, if their work is zero-rated or reduced-rated, then so are the ‘building materials’. But some items are not building materials and remain standard-rated” (VAT Notice 708, §2.2).

Check first whether that rule can bite at all, because on most jobs it cannot: “The construction of a new building and work to an existing building is normally standard-rated” (§2.1). Standard-rated means the ordinary rate, the one most work and most goods carry. Buying the parts yourself lands them there too, because “Retailers and builders merchants charge VAT at the standard rate on most items they sell” (§2.2). So the rate the materials inherit is only worth having where the work itself carries a lower one, and the case HMRC’s energy-saving materials notice sets out is the one below. Which other jobs qualify is a determination for your supplier to make.

Where the package reaches a rate the parts cannot

For one class of work the package is the only route on which the materials reach the lower rate at all, and HMRC’s energy-saving materials notice states it in two parts: “However, if you supply energy-saving materials without installing them your supply will be standard-rated. For example, the sale of energy-saving materials by a retailer is always standard-rated” (VAT Notice 708/6). The installation is the thing carrying the relief: “A zero rate applies to the installation of certain specified energy-saving materials from 1 May 2023 to 31 March 2027.”

Two details keep that from going stale on you. The relief has an end date and a successor rate rather than a cliff: “From 1 April 2027 onwards these will revert to the reduced rate of VAT of 5%.” And a grant does not rescue the supply-only route: “If you supply heating equipment without installing them your supply is standard-rated, even if it’s grant-funded.” So whatever you save by buying the parts yourself and the tax you then pay on them run in opposite directions here, and which is bigger depends on your two quotes.

Two trades on the same Dutch house, opposite on the materials

Paint rides the low rate and insulation material does not, on the same house and under the same regulator. The 9% rate reaches insulating, painting, plastering and wallpapering a house more than two years old: “Het isoleren , schilderen , stukadoren en behangen van woningen die ouder zijn dan 2 jaar valt onder het 9%-tarief” (Belastingdienst). Work on a house that is not on the regulator’s own list of low-rated jobs is taxed at 21%.

For painting, the low rate reaches the supply half. The regulator’s page on painting says the 9% rate applies to houses older than two years and that it also covers, in its own list, the materials used: “de gebruikte materialen” (Belastingdienst, schilderen). For insulation, the identical-looking job splits: “Dan vallen de arbeidskosten voor het aanbrengen van het isolatiemateriaal aan vloeren, muren en daken bij woningen ouder dan 2 jaar onder het 9%-tarief”, the labour of fitting insulation to floors, walls and roofs at 9%, and then, flatly, “De (isolatie)materialen vallen onder het 21%-tarief, ook als u die materialen in uw eigen bedrijf maakt”, the materials at 21% even where the contractor made them in their own business (Belastingdienst, isoleren).

Two readings of a quote get closed off here. The rate does not change when the work is passed down a layer: “Het 9%-tarief geldt ook als u als hoofdaannemer het werk uitbesteedt aan een onderaannemer.” And the categories are drawn by the Belastingdienst for tax, which is why it is the Belastingdienst that names doors, frames and thatch as things that do not count as insulation material at all: “Deuren, kozijnen en riet zijn voorbeelden van zaken die niet gelden als isolatiemateriaal”. Two of those three are where you would point if asked where the draught comes in.

The line runs through the middle of a fitted kitchen

What counts as a building material is HMRC’s own category, and it does not follow the trade, the quote heading or any boundary you would draw yourself. HMRC makes the inheritance conditional on exactly that: “If the goods are not ‘building materials’, you must charge VAT at the standard rate on the supply of those goods” (§11.2). Take a fitted kitchen and two more rooms in the same house:

• The carcasses and the doors. In. “Finished or prefabricated kitchen furniture and materials for the construction of fitted kitchen furniture are building materials for VAT purposes when ordinarily incorporated in a building” (§13.5.1).
• The same joiner’s fitted wardrobe upstairs. Out. “All other finished or prefabricated furniture and materials for the construction of fitted furniture are not building materials for VAT purposes” (§13.5.3).
• The oven, the hob and the dishwasher. Out, and Building Regulations do not change it. HMRC puts most gas-powered and electricity-powered devices outside the category “even if they’re required to be incorporated in a building as a requirement of Building Regulations” (§13.6). The notice spells the class out as “free-standing and integrated appliances such as cookers, fridges, freezers, dishwashers, microwaves, washing machines” (§13.9).
• The tiled floor. In. “Other forms of flooring or floor covering, such as linoleum, ceramic tiles, parquet and wooden floor systems are building materials” (§13.7).
• The carpet in the next room. Out, by name: “Carpets, carpet tiles and underlay” (§13.7).

On a standard-rated job none of that costs you anything, because everything carries the same rate regardless. On a reduced-rated one it costs twice over. In the notice’s own wording: “But if you’re working on a reduced-rated project, you cannot reduced-rated the incorporation of standard-rated goods that are not building materials. You must standard rate both elements of your charge” (§11.2). Read that as: the excluded item drags its own fitting out of the relief with it, so you pay the full rate on both.

A third bucket neither quote has to cover, and a Dutch regulator listed it

Neither quote has to cover the site, and the Dutch heritage scheme’s statutory annex is a regulator writing out what sits in the gap. Direct costs are the materials worked into the building plus the labour on them, “de kosten van de daarin te verwerken materialen en het daarbij behorende loon van het personeel”, taking in subcontractors and scaffolding where the work is maintenance. Indirect costs are the separate thing: “de kosten van de hulpmiddelen en de organisatie die nodig zijn om het bouwwerk tot stand te brengen”, the tools and the organisation needed to get the work done at all (Leidraad subsidiabele instandhoudingskosten, a statutory annex to the Subsidieregeling instandhouding monumenten).

The annex is specific enough about what that organisation layer buys to be useful on any job: “materieel dat noodzakelijk is voor de uitvoering van de instandhoudingswerkzaamheden, zoals een schaftkeet, afvalcontainers, hekwerken, hoogwerkers, huur van materialen of materieel”, meaning a site hut, skips, fencing, cherry-pickers and plant hire. The annex is equally specific about what falls outside it, down to parking, coffee and tea, and temporary accommodation: “parkeerkosten, koffie en thee, tijdelijke verblijfskosten”. A government drawing a statutory line through the tea tells you this bucket gets argued about.

The liability that is priced without being named

Unbundling moves a block of liability that neither of the two quotes prices. Where installation is inside the contract, the Consumer Rights Act 2015 treats a bad fit as a fault in the goods, which changes which remedies apply. Goods fail to conform where “(a) installation of the goods forms part of the contract, (b) the goods are installed by the trader or under the trader’s responsibility, and (c) the goods are installed incorrectly” (s.15). That route carries the right to repair or replacement, and the right to a price reduction or the final right to reject (s.19(4)). It does not carry the short-term right to reject. The Act attaches that one at s.19(3) to a breach of the goods-quality term, so a bad install is not something you can hand back on the spot.

Section 19(2) is the one a reader will not guess: “But, for the purposes of this section and sections 22 to 24, a failure to conform as mentioned in subsection (1)(a) to (c) is not a failure to conform to the contract if it has its origin in materials supplied by the consumer.” Where the materials are yours, the fitter is not answerable for a failure traced to them. Buying the parts and hiring a fitter does not only re-price the job. It transfers a defined block of risk to you, and the saving you booked is partly the price of that transfer.

This does not strand you. What you have instead is two contracts where the bundle gave you one, and they cover different things: the part sits in your contract with whoever sold it, carrying the satisfactory-quality term, while the fitting sits in a service contract of its own, which always carries its own term: “Every contract to supply a service is to be treated as including a term that the trader must perform the service with reasonable care and skill” (s.49). Where that is breached, repeat performance means the trader does it again and “must bear any necessary costs incurred in doing so (including in particular the cost of any labour or materials)” (s.55). Workmanship stays theirs on both routes. What changes is who owns the argument about which half failed. A mixed arrangement is neither of the two clean routes: the supplier brings the specialist parts and you buy some of the materials yourself, and section 19(2) then draws its line through the middle of one job.

One more provision turns on the price itself. Satisfactory quality is judged partly on what you paid: goods meet “the standard that a reasonable person would consider satisfactory”, taking account of “(a) any description of the goods, (b) the price or other consideration for the goods (if relevant), and (c) all the other relevant circumstances” (s.9). Price is one factor among several there, and a conditional one, so a package price that never names what the materials cost makes that benchmark harder to establish.

Worked example: Gareth in Cardiff and Lotte in Haarlem

Gareth is replacing loft insulation and has two routes in front of him. One supplier quotes supply and fit as a single fixed price; a merchant will sell him the same rolls over the counter and a local fitter will put them in for a quoted sum. If the fitter works on time and materials, Gareth needs an estimate of the hours or a ceiling before there is a total to compare at all. The question underneath both is whether this job is the installation of “certain specified energy-saving materials” and so zero-rated. He puts it to the supplier in writing, and the same one to the fitter about the labour, before comparing anything.

If the supplier’s answer is no, the tax cancels on both sides and the two totals are a fair comparison on price alone. For most work on an existing house that is where it lands, and on price the cheaper total is then the cheaper job.

If both answers are yes, the arithmetic turns. A retailer selling energy-saving materials is standard-rated whether or not someone else installs them, while the installed materials are zero-rated to 31 March 2027, carrying no VAT at all, and reduced-rated at 5% after that. Both of his totals already include whatever VAT they carry, so he still compares them as they stand. Then he reads the VAT line on the merchant’s own paperwork. That figure is tax the unbundled route carries and the bundled one does not.

Put numbers on it. Say the single price is GBP 1,400 and the rolls plus the fitter come to GBP 1,250, so unbundling looks GBP 150 cheaper. If the install is zero-rated, the bundled price carries no VAT at all, while the merchant’s VAT line on the rolls might read GBP 60. Strip that GBP 60 out and the gap would be GBP 210. The tax has already taken it back to the GBP 150 he can see, so on a zero-rated install the tax works against unbundling. Those figures are his to substitute, and the direction holds whichever way they fall.

The part Gareth cannot see on either piece of paper is what he is taking on. If he buys the rolls himself, a failure that originates in them stops being the fitter’s problem: that is the section 19(2) line, on the terms set out above. The fitting is still his, because reasonable care and skill attaches to the work whoever supplied the goods. Under the single price, one party owes him the goods and the fit together. Under the other, the fault line between them is his to argue.

Lotte is having wall insulation fitted and the hallway repainted by one contractor, on a home her family has lived in for eleven years. She is weighing the same choice as Gareth, and the Dutch split changes where it bites. On insulation the low rate never reaches the material, even when the contractor made it themselves: “De (isolatie)materialen vallen onder het 21%-tarief, ook als u die materialen in uw eigen bedrijf maakt”. So the bundle has no lower rate to offer her on that material. What the merchant would charge, and what they would add in BTW, is a question for the merchant. The painting is the other way about, because there the low rate does reach the materials the painter supplies.

What she does have is an entitlement Gareth lacks. Where work forms part of a larger contract the supplier has to split it: “Maakt het werk deel uit van een groter aannemingswerk? Dan splitst u in uw offerte en factuur de werkzaamheden die onder het 21%-tarief vallen en de werkzaamheden die onder het 9%-tarief vallen.” That delivers two rate groups rather than an itemised quote: 21% on the insulation material, 9% on the insulation labour and on both halves of the painting.

The two rates are twelve points apart, so any line in the wrong group is out by 12% of its before-tax value. On a line of EUR 1,000 before tax that is EUR 90 of VAT against EUR 210, a gap of EUR 120. The direction decides what it costs her. Painting or insulation labour landing in the 21% group is money she is being charged and should not be, and the quote is where she can have it put back to 9%. The insulation material runs the other way. If it sits at 9% on the quote, the same duty reaches the invoice, so the bill arrives above the paper she agreed to. Asking for it to be moved to 21% now is how the number she agrees to becomes the number she pays, and whether she would owe the difference later turns on the contract. So she reads where every line landed before she reads anything else, and she asks at the quote stage, because a line that wins at 9% and gets rebilled at 21% costs her the same 12% whether it was a slip or a tactic.

What to ask before you choose

A Dutch reader can demand the rate split; a British one is better off pinning down the answer.

Where a Dutch job mixes 9% and 21% work, splitting it in the quote and the invoice is an obligation on the supplier, not a concession to ask for.

Nothing in Notice 708 or the Consumer Rights Act sets an itemisation duty for a consumer quote; a trade code or a scheme might. Either way, for a British reader, the format is not ground worth arguing on. Under s.50, a service contract is treated as including “anything that is said or written to the consumer, by or on behalf of the trader, about the trader or the service” where you took it into account in deciding to contract. Read that way, what the supplier tells you the price covers becomes part of what they owe you. The section also carries through “anything that qualified it and was said or written to the consumer by the trader on the same occasion”, so a caveat given in the same conversation travels with the promise it qualifies.

So, with the paperwork for both routes in front of you, whether that is one quote or three:

1. Ask what the one price includes, in writing, and keep the reply. Email is enough.
2. Ask which VAT rate applies to the work and why. On a standard-rated job the VAT comparison stops mattering, so this is the question that tells you whether any of the rest applies.
3. Ask which items in the job are not building materials. Appliances and carpet are on the list, and on a reduced-rated job they take their own fitting out of the relief with them. On a zero-rated job, ask the supplier which items the relief reaches.
4. Ask what the price covers for the site: the hut, the skips, the fencing, the access plant. This is the bucket a supply-and-fit comparison can leave out. Scaffolding is the one to ask about separately, since quotes put it in different places, sometimes with the labour and materials and sometimes with the site, and your two may not agree.
5. Hold the materials line against the ceiling for the trade, as a share of the labour line, the same ceilings used for setting a mandate: 35% for painting, 50% for electrical work, 60% for insulation, 80% for plumbing, 100% for roofing, and 75% in the Netherlands, where roofs tend to be tile rather than slate. These are deliberately generous, so a line well under them says nothing and one well over them is a question. Where your trade is not on the list, ask what share the contractor works to and hold them to their own answer.
6. If you are supplying only some of the materials yourself, say so in writing and ask the fitter to confirm what they will and will not stand behind.

If you are reading this before anyone has quoted, go further upstream. Write the brief so both routes have to answer the same questions, which is what makes the two numbers comparable at all. Set a mandate on the route you choose. Write supply, fit and the site into your maintenance plan once, and you will not work them out again at every quote.