Invoicing for construction work is not the same as invoicing for a consulting project or a creative service. Construction projects run over weeks or months, involve multiple subcontractors, use staged payment structures, and often include retention clauses that withhold a portion of payment until final sign-off. Getting the invoicing right from the start prevents payment delays, disputes, and compliance issues.
This guide covers the full picture: progress billing, milestone invoices, retention, VAT treatment for building work in the UK, and the key fields every construction invoice template should include.
What makes a construction invoice different?
Unlike a standard service invoice, a construction invoice often needs to handle:
- Staged payments: work is invoiced progressively as it is completed, not as a single payment at the end
- Retention: a percentage (typically 3–5%) withheld until the defects liability period expires
- Variations: changes to the original scope that are invoiced separately or incorporated into interim applications
- Materials on site: some contracts allow invoicing for materials delivered but not yet installed
- CIS deductions (UK only): the Construction Industry Scheme requires main contractors to deduct tax at source before paying subcontractors
Progress billing: invoicing as the work proceeds
Progress billing — also called interim billing or application for payment — means invoicing for work completed up to a specific point in the project, rather than waiting until final completion.
The most common approach is to invoice based on a percentage of total contract value:
- Stage 1 complete (20%): invoice for 20% of the contract sum
- Stage 2 complete (50%): invoice for the next 30% (total 50%)
- Practical completion (95%): invoice for the next 45% (total 95%)
- End of defects liability period: invoice for the final 5% (retention release)
The contract should set out these stages clearly. If it does not, you and the client should agree in writing on the billing milestones before work begins.
Milestone invoices: billing on delivery, not on time
An alternative to percentage-based billing is milestone billing, where payment is triggered by the completion of a specific, verifiable deliverable:
- Foundations complete and inspected
- Roof structure erected and weathertight
- First fix (electrical, plumbing) complete
- Plastering and internal finishes complete
- Snagging complete and sign-off received
Milestone billing is cleaner than percentage billing because both parties can verify whether the milestone has been reached. There is less room for disagreement about what percentage of the project is "done".
The invoice should clearly state:
- Which milestone is being invoiced
- A brief description of the work completed
- Any supporting evidence (site photos, inspection certificate, snagging list signed off)
Retention: how to show it on a construction invoice
Retention is an amount withheld from each interim payment as security against defects discovered after practical completion. It is typically 5% during the construction phase, reducing to 2.5% after practical completion until the defects liability period ends.
On the invoice, retention should be shown explicitly:
Gross value of work this application: £45,000.00
Cumulative gross value to date: £120,000.00
Less: retention (5%): -£6,000.00
Net amount due this application: £39,000.00
Less: amount previously certified: £75,000.00
Amount due this invoice: £39,000.00
This format — common in the UK under JCT and NEC contract structures — shows the cumulative picture and makes it clear what is being claimed.
When the defects liability period expires (typically 12 months after practical completion), you issue a final invoice for the retained amount.
Construction invoice template: fields to include
Here is the full set of fields a construction invoice template should cover:
| Field | Example | |---|---| | Invoice number | INV-2026-014 | | Application number | Application for Payment No. 3 | | Issue date | 2 June 2026 | | Contract reference | Contract No. SC-2024-007 | | Contractor | Greenfield Build Ltd, Registered: 12345678 | | Client | Northpoint Developments Ltd | | Site address | 14 Elms Lane, Sheffield S1 2AW | | Description | Superstructure and first fix, Weeks 8–14 | | Gross value claimed | £45,000.00 | | Retention (5%) | -£2,250.00 | | CIS deduction (20%) | -£8,550.00 | | VAT (5% on domestic, 20% on commercial) | £1,710.00 | | Net amount due | £35,910.00 | | Due date | 30 June 2026 | | Payment method | BACS — sort code 12-34-56 — account 87654321 |
Not every field applies to every project. Adapt the template to match your contract terms.
VAT on construction work in the UK
VAT on building work depends on what type of work is being done and who is paying for it.
Standard rated (20%)
Most commercial construction, renovation, and repair work on commercial buildings is standard rated at 20%.
Reduced rate (5%)
The 5% reduced rate applies to certain residential work, including:
- Conversion of a non-residential building into residential use
- Renovation of a residential property that has been empty for at least 2 years
- Installation of energy-saving materials in residential properties
Zero rated (0%)
New build residential construction is generally zero rated. This means no VAT is charged on the construction services for a new dwelling.
Domestic reverse charge (DRC)
Since March 2021, the Domestic Reverse Charge (DRC) applies to most VAT-registered construction businesses when supplying services to another VAT-registered business within the construction supply chain. Under DRC:
- The contractor does not charge VAT on the invoice
- The client accounts for the VAT instead
- The invoice must state: "Domestic Reverse Charge — Customer to account for VAT to HMRC"
DRC applies to most construction and building services, including labour-only subcontractors. It does not apply to end-user clients (property developers who use the building themselves or homeowners).
Getting VAT wrong on construction invoices is a significant compliance risk. If you are in any doubt, check with HMRC or a qualified accountant before issuing.
The Construction Industry Scheme (CIS) — UK only
The Construction Industry Scheme (CIS) requires main contractors to deduct tax at source from payments made to subcontractors. The standard deduction rate is 20% (or 30% if the subcontractor is not registered with CIS).
On the subcontractor's invoice
The subcontractor issues a normal invoice for the full gross amount of their labour (materials are usually excluded from CIS). The invoice should include:
- The gross labour amount
- A note indicating the CIS deduction applicable: "CIS deduction 20% — £X"
- The net amount the contractor will actually pay
On the main contractor's records
The main contractor deducts the CIS amount before paying, and submits a monthly CIS return to HMRC. The deducted amounts are credited against the subcontractor's income tax liability.
CIS invoice example
CIS INVOICE — Subcontractor
GS Plastering Ltd — UTR: 1234567890
Application No. 4 — 2 June 2026
Labour (plastering — 3 residential units): £8,000.00
Materials (included, not subject to CIS): £1,200.00
Gross labour (subject to CIS): £8,000.00
CIS deduction at 20%: -£1,600.00
Net payment due: £7,600.00
VAT on total (£9,200 × 20%): £1,840.00
Total to pay: £9,440.00
Note: VAT is chargeable on both labour and materials even where CIS deduction applies.
Applications for payment vs invoices
In many UK construction contracts, particularly under JCT or NEC terms, the document submitted by the contractor is technically an Application for Payment (AFP), not an invoice. The difference is that an AFP triggers the contract's certification and payment mechanism — the client's quantity surveyor certifies the amount due, and only then is a formal invoice (or payment certificate) issued.
In practice, many smaller construction businesses use a single document that serves as both application and invoice. This is acceptable for most domestic and small commercial projects. For larger public or commercial contracts, follow the specific payment mechanism in the contract carefully.
Common mistakes in construction invoicing
Not specifying the period of work
"Construction works" is not enough. The invoice should specify the period (e.g., weeks 8–14), the site address, and the scope covered by this application.
Ignoring retention
Issuing invoices without accounting for retention means you will undershoot your expected payment. Track retention separately so you know exactly when to claim it back.
Charging the wrong VAT rate
Applying 20% to work that should be 5% or zero-rated overcharges the client and creates a VAT liability you do not legally owe. Applying 0% when 20% is correct exposes you to assessments and penalties.
Missing the CIS deduction
For registered subcontractors, not showing the CIS deduction causes confusion for the main contractor and can lead to incorrect payment.
No payment terms
Construction projects can drag on, and without a clear due date on each invoice, clients may defer payment indefinitely. Always include a specific due date, not just "30 days from invoice".
Invoicing for variations
When the client requests work beyond the original contract scope, you should issue a separate variation invoice or include the variation as a distinct line item on the next application for payment. Label it clearly:
"Variation — additional drainage run as agreed [date]: £2,400.00 net"
Where possible, get variation instructions in writing before carrying out the additional work.
Summary
A strong construction invoice template needs to be more than a standard service invoice. It must handle staged billing, retention, VAT at the correct rate, and — where applicable — CIS deductions. Using a structured format from the start prevents disputes, helps cash flow, and keeps both the main contractor and client aligned on what has been claimed and certified.
Invoice Creator lets you build clean, professional invoices and export them as PDF — adaptable to construction billing with retention and staged payments. If you are starting a project that requires staged payments, take a look at our deposit invoice guide for guidance on billing upfront payments before work begins.