Construction bill of quantities — the complete guide

A bill of quantities (LV) is a structured list of all construction work to be carried out as part of a project — item by item, with descriptions, quantities and units. It forms the basis of every serious request for a quote and is therefore the most important prerequisite for making contractors' quotes genuinely comparable. Request quotes without one, and their content, quantities and quality differ so greatly that comparison is almost impossible.

Key points at a glance

• A bill of quantities describes all construction work item by item — allowing several contractors to price the same work so you can compare fairly.
• VOB/A § 7 requires an “unambiguous and comprehensive” specification for public contracts — not mandatory in private construction, but effectively the only protection against variations.¹
• Construction error costs total around 13 billion euros annually across Germany — many arise because work was not clearly specified beforehand.²
• A professional bill of quantities from 49 euros generally saves many times that amount in variation costs — and enables you to compare quotes on equal terms.

What is a bill of quantities?

A bill of quantities — abbreviated LV in German — is the central document when tendering construction work. It describes every service a contractor is to provide as a separate item, with number, description, quantity and unit. VOB/A § 7 calls this an “unambiguous and comprehensive specification” and makes it mandatory for public contracts.¹ Although not legally required in private construction, it is in practice the only reliable protection against subsequent disputes over the agreed scope of work.

Think of a bill of quantities as a very detailed shopping list for your construction project: instead of “renovate bathroom”, it says, for example, “Item 01.05. Porcelain floor tiles, R10, size 60 × 60 cm, laid on a sand bed, including joints, 12 m²”. Only this precision makes a contractor's quote reliable — and a second, identical description makes comparison possible at all.

We describe the formal structure and individual components further below in the section on the structure of a bill of quantities.

Why is a bill of quantities so important?

In practice, people comparing contractors' quotes are usually not comparing identical work. In a study involving 700 quality inspections, the BSB found an average of 31 defects per construction project — many stemming from unclear or incomplete tender documents.³ This is precisely where a bill of quantities helps: it turns a vague “renovate bathroom” into a verifiable item that every contractor can price on the same basis.

The financial implications are considerable. Across Germany's construction industry, error costs total around 13 billion euros per year, equivalent to around 8 % of industry turnover (BauInfoConsult, 2022).² A significant share arises from unclear specifications — and therefore missing or inadequate bills of quantities.

On behalf of project owners, the Federation of German Consumer Organisations (vzbv) brought legal action against 24 unfavourable clauses in construction contracts. A common finding: entire houses are described on three pages — leaving project owners unable to see what is and is not included.⁴ A good bill of quantities fills precisely this gap.

The most common consequences of tendering without a bill of quantities:

• Quotes are not comparable: Three contractors interpret the same job three different ways — the cheapest option costs 18.000 euros and the most expensive 32.000 euros because different work has been priced.
• High variation risk: Anything not described beforehand is billed as additional work during execution. How to specifically avoid variation costsis explained in a separate guide.
• Disputes over scope: Who pays to dispose of the old flooring? Was waterproofing under DIN 18534 included? Without a bill of quantities, a court may ultimately decide.
• Loss of quality through cheaper competition: Without clear requirements, the cheapest contractor often uses inferior materials — saving in the short term but costing more later.

How is a bill of quantities structured?

DIN 276 and VOB/C define the technically correct structure of a construction bill of quantities.⁵ Put simply, every bill of quantities has three levels — sections, trades and individual items. The main components of each item are always the same.

The five essential elements of an item

1. Item number:Unique and hierarchical (e.g. 01.03.02 = section 01, trade 03, item 02).
2. Short text / description: What work is required, which material, which standard? Vague terms such as “appropriate”, “commercially available” or “as required” have no place in a good bill of quantities.
3. Quantity:Specific quantity (e.g. 12 m², 3 units, 5 linear metres).
4. Unit: The appropriate unit for the quantity (square metres, linear metres, units, cubic metres).
5. Unit price / total price: Completed by the contractor in the quote, left blank beforehand by the project owner or designer.

Three structural levels

At the highest level, sections such as “structural work and internal fit-out” or “external works” are defined. Below these come the trades — for example, “masonry”, “screed” or “painting”. Within each trade, the individual items that the contractor actually carries out are listed. A complete refurbishment contains 100 to 400 individual items, depending on scope.

The mandatory items for each trade follow from these three levels. To standardise wording, GAEB developed STLB-Bau (Standard Construction Specification Book) — a common vocabulary used across trades (more in the standards section below).

What types of bill of quantities are there?

VOB/A § 7 distinguishes two fundamentally different ways of tendering construction work.¹ Your choice determines who bears the risk of unclear quantities or execution details — and how fairly you can ultimately compare.

The table above shows which option best suits your project. A brief rule of thumb: for renovations with clearly measurable quantities, a detailed bill of quantities is almost always better. For complete new-build packages, a performance-based tender can make sense if you want exactly one contractual partner.

Who prepares a bill of quantities?

In Germany, bills of quantities are traditionally prepared by architects, civil engineers or specialist designers. The HOAI (Fee Regulations for Architects and Engineers) lists preparation as service phase 6 — part of the conventional architectural services for construction projects.⁶ For renovations, particularly small and medium projects, project owners often do not appoint an architect — leaving the question: prepare it yourself or have it prepared?

Option 1: prepare it yourself

In theory, this is possible. With some time and a good template, you can prepare a simple bill of quantities yourself, especially for individual trades such as bathroom refurbishment or flooring replacement. Experience suggests 8 to 20 hours, depending on scope. Risks include missing items, incorrect DIN references and unclear quantities — precisely the problems a bill of quantities is meant to prevent.

Option 2: architect or specialist designer

Architects and specialist designers prepare bills of quantities under the HOAI fee table as part of service phase 6 (preparation of contract award). In practice, this service is rarely offered independently — it is usually linked to detailed design (phase 5) and assistance with contract award (phase 7). Realistic costs for an externally commissioned bill of quantities for renovation are 1.500 to 4.000 euros, depending on contract value, fee zone and bundling with other phases.

Option 3: online bill of quantities service (cleverbauen24 LV-Express)

This is where our LV-Express comes in: a digital bill of quantities tailored to your property, written in DIN/VOB-compliant language and delivered immediately as PDF + Excel — for 49 euros. Answer questions in an online calculator about the property, postcode, construction year, rooms, scope and external envelope, and receive the bill of quantities as an email attachment within minutes. The comparison:

If you prefer the quick route, create your bill of quantities directly with our Bill of quantities tool.

Which standards apply to a bill of quantities?

Three sets of rules shape a professionally prepared construction bill of quantities in Germany. Project owners do not need detailed knowledge of them — but a good bill should take all three into account.

VOB/A — German Construction Contract Procedures

VOB/A regulates the award of public construction contracts. § 7 requires an “unambiguous and comprehensive” specification.¹ In private construction, it is a recommendation rather than a requirement — but a proven one: reputable contractors will respond more professionally to a VOB/A-based tender.

VOB/C — General Technical Contractual Conditions

VOB/C comprises over 60 ATVs (General Technical Contractual Conditions) covering trades — from DIN 18299 (general provisions) through DIN 18300 (earthworks) to DIN 18382 (electrical installations).⁵ It defines the information each item must contain — for example, tiling items must state laying method, joint width and substrate.

STLB-Bau — Standard Construction Specification Book

GAEB (Joint Committee for Electronics in Construction) developed STLB-Bau as a standardised collection of specification texts. A decorator thus describes a wall paint in Munich exactly as in Hamburg — making quotes comparable nationwide.

How do you use a bill of quantities properly?

A bill of quantities only becomes valuable if you use it consistently. VPB experts found that around 75 % of all payment schedules in private construction contracts do not match actual construction progress.⁷ A clear bill of quantities provides the basis for properly structuring payment schedules, quantity measurements and defect complaints.

The typical sequence:

1. Prepare the bill of quantities — yourself, through a specialist designer or via LV-Express.
2. Invite three contractors to quote — each receives the same bill of quantities with blank price columns.
3. Compare quotes — item by item. Our guide explains how this works in practice Comparing contractors' quotes.
4. Negotiate the best quote — see our guide Negotiating a contractor's quote. With three quotes obtained, you have a clear negotiating basis.
5. Award the contract — the bill of quantities becomes part of the contract. What specifically needs checking in a construction contractis covered in a separate guide.
6. Monitor the construction phase — take measurements on site, document variations, raise defects. With the Building work acceptance checklist and Sample defect complaint letter you have the key tools for this.

These six steps guide a private project owner safely through a renovation — and the bill of quantities is the central document in each one.

How much does a bill of quantities cost?

Cost is one of the most frequently asked questions — and depends on which route you choose. Architectural services under the HOAI fee table are allocated to phases 5 (detailed design) and 6 (preparation of contract award).⁶ For private renovations, these rates usually only pay off at larger project values.

A specific practical example: Markus H. from Berlin-Pankow had his renovation quote reviewed — and discovered two unagreed items alone that would later have appeared as variations. Savings: over 3.200 euros. A bill of quantities prepared beforehand eliminates precisely these item gaps from the outset.

Instead of a static template, create a property-specific bill of quantities directly with our Bill of quantities tool — including for its most common use, bathroom refurbishment. Read about typical costs in our guide Bathroom refurbishment costs.

What exactly does cleverbauen24 LV-Express give you?

We developed LV-Express specifically for private project owners renovating without an architect — who still need a professional bill of quantities to compare contractors' quotes properly. The output includes:

• PDF to send to contractors — structured by trade, with items, quantities and units, in DIN/VOB-compliant language.
• Excel (.xlsx) for editing — each item as an editable row. You can delete, add or have the contractor enter unit prices directly.
• Four areas as standard — interiors, external envelope, building services, external works. Fully adaptable to your project.
• Measurement clause included — we estimate quantities from your information. On-site measurement by the contractor is recommended before execution; the bill includes a clause specifically for this.
• Delivery within minutes — by email directly after online payment. Generally within 15 minutes.

Anyone who prepares a bill of quantities as the basis for requesting quotes can then compare the individual quotes fairly — and have us review them if needed. A full construction quote review at cleverbauen24 starts at 79 euros and provides a 20-page written review report.

Frequently asked questions about bills of quantities

Do I really need a bill of quantities for a small renovation?

From a contract value of around 10.000 euros, a bill of quantities is almost always worthwhile. Below that, a written specification with clear items is often sufficient. Anyone obtaining several quotes benefits from a standardised comparison framework even on smaller projects — otherwise you compare apples and oranges, and variations quickly turn the apparently cheapest provider into the most expensive.

What is the difference between a bill of quantities and a quote?

The bill of quantities describes the required work — before tendering. The quote is the priced response from the contractor, including unit prices and the total sum. In other words: the bill of quantities is the blank table of items and quantities; the quote is the completed table with prices. More on the difference between a quote and estimate in our guide Estimate vs. quote.

Can I convert an existing quote into a bill of quantities?

To a limited extent, yes. If a contractor supplied a quote in bill-of-quantities format — with items, quantities and units — you can use it as the basis for further comparison quotes. Lump-sum or broadly described quotes are usually unsuitable. In that case, it makes sense to prepare your own bill of quantities afterwards — or have cleverbauen24 review the existing quote.

What exactly does “DIN/VOB-compliant” mean?

DIN/VOB-compliant means every item follows VOB/C requirements — naming the substrate, material, laying method, quantity unit and trade-specific details. Generic wording inappropriate to the trade is also avoided. DIN/VOB-compliant tendering produces quotes on an equal technical footing that stand up in a dispute.

What if the contractor disagrees with the bill of quantities?

Reputable contractors generally welcome a bill of quantities — it saves clarification work. Resistance is itself a warning sign: contractors often want to leave room for later additional work. In that case, check the indicators described in our guide 7 warning signs of overpriced contractors' quotes .

Does cleverbauen24 also prepare bills of quantities for commercial project owners?

LV-Express is designed for private refurbishments and renovations — from bathroom refurbishment to complete refurbishment of a detached house. It can also be used for smaller commercial projects such as converting commercial premises, a practice or a holiday flat. For larger commercial projects, we recommend discussing requirements personally with our team.

Sources

1. VOB/A § 7 — specification. German Construction Contract Procedures, Part A (2019 edition).
2. BauInfoConsult: German construction industry error cost balance 2022, around 13 billion euros (approx. 8 % of industry turnover). Reported via haustec.de.
3. BSB / IFB (Institute for Building Research): long-term construction quality study, 700 quality inspections across 100 construction projects, 2020–2024. Published May 2025.
4. Federation of German Consumer Organisations (vzbv): legal action against 24 unfavourable clauses in construction contracts and specifications.
5. VOB/C — General Technical Contractual Conditions for Construction Work (DIN 18299 ff., over 60 ATVs covering trades).
6. HOAI 2021 — Fee Regulations for Architects and Engineers. Service phases 5 (detailed design) and 6 (preparation of contract award).
7. VPB: analysis of construction contracts and payment schedules, reported via baulinks.de.
8. GAEB (Joint Committee for Electronics in Construction): Standard Construction Specification Book (STLB-Bau).
9. § 631 ff. BGB — contract for work. Statutory basis for private construction contracts without incorporation of VOB.
10. DIN 276 — construction costs. Classification of cost types as the basis for bill-of-quantities structure.
11. BSB / IFB: construction damage and damage costs, based on AIA AG insurance data, November 2018.
12. Federal Statistical Office (Destatis): residential construction prices, November 2025 (+3,2 % year on year). Press release PD26/011, January 2026.