How to record trade jobs on site so the office can invoice without ringing you

This guide shows UK trade businesses how to record each job on site, from the brief before the visit to the handover back to the office, so the engineer brings back everything needed to invoice the job and answer any argument about it later. It is for owner-run firms where the person on the tools often does the paperwork too, whether you fix boilers, change consumer units, fit kitchens or repair roofs. You get a field-by-field checklist you can copy onto paper or into an app, what photos to take and why, how to record extra work before you do it, the certificates customers are owed, and an illustrative consumer unit upgrade that turned up more work than quoted.

Points about building regulations, gas and electrical safety and data protection are summarised from the official sources listed at the end. They are not legal advice, and the person doing the work is always responsible for knowing the rules for that work.

Brief the engineer before they set off so they don't ring the office from the driveway

A job sheet starts before the visit. An engineer who arrives without the access details, the quoted scope or the name of the person who can approve extra work either rings the office or guesses, and the guess is where most "that's not what I asked for" disputes begin.

The brief should come straight from the enquiry and the accepted quote, not from someone's memory of a phone call. If your enquiry records are patchy, fix that first: the calls guide covers the short enquiry record that makes a good booking possible.

What a useful job brief contains

• Job reference that links the enquiry, quote, job sheet, photos and invoice.
• Who is who. The customer (who pays), the site contact (who lets you in) and the person who can approve extra cost. For a rented flat these can be a landlord, a tenant and a letting agent.
• Address and access. Arrival window, parking (permit zone, driveway, nearest loading bay), key safe or concierge, pets, stairs or a top-floor flat with no lift.
• Customer notes. Anything the customer told you that changes the visit: a baby asleep upstairs, a shift worker who needs quiet before 10am, a vulnerable occupier, a previous complaint.
• The quoted scope. The accepted quote version, with exclusions and provisional sums, so the engineer knows exactly what is and is not in the price.
• Approval limit. What the engineer may add without asking (for example, a fitting under £20) and what needs the customer's or agent's written OK.
• History and parts. Notes and photos from earlier visits, boiler or appliance make and model if known, and parts already ordered or on the van.

Keep key codes and access details out of personal WhatsApp

Put key safe and alarm codes in the job record, visible to the people doing that job, and remove them when the job closes. A code sent to a personal chat stays there long after the engineer has left the business.

Record the facts on site that let the office invoice without phoning you

The test: could someone who was not there invoice the job correctly, and explain it to the customer, from what is written down? "Done, see pics" fails. So does shorthand only the engineer can read.

Separate what was reported, what you found and what you did

Write these as three different things. "Customer reports no hot water since Sunday" is the customer's account. "Diverter valve stuck" is your finding. "Replaced diverter valve cartridge, tested heating and hot water, both working" is the work. Keeping them apart matters when a customer later says the problem was something else.

Record all the time on site, including the parts that are not chargeable

Note arrival, departure and any time off site collecting parts. The office decides what is chargeable against the quote or your hourly terms. If engineers only write the hours they think the customer will accept, you lose the information you need to price the next job.

Say what is left and who owns the next step

"Further visit required" is not enough. Write what is outstanding, why, and what happens next: "Awaiting replacement pump, office to order, customer told return within five working days". If nothing is outstanding, say so.

The job sheet fields to copy onto paper or into an app

Every job sheet needs the same core facts: the job reference, the customer and site, times on site, what was reported, found and done, materials, agreed changes, photos and a clear status. Our job sheet template for UK trades sets out the eight core fields on one page, with the extra fields for certificate and building work, a filled-in example and a two-week trial routine. Use it as a paper sheet, a spreadsheet or the list you test a job app against.

Take photos with a purpose: before, during, after and anything about to be covered up

Forty photos of the same radiator are no help to anyone. A handful of the right ones can settle an argument in a minute. Each photo should answer a question someone might ask later: what was it like before, what is under that floor now, which model did you fit?

The photos worth taking on most jobs

• Before. The existing installation, any damage already there (a cracked tile, a stained ceiling, a scuffed wall in the hallway) and the working area as you found it.
• Hidden work. Pipework, cable runs, joints, clips and fixings before boards, plasterboard or screed go back down. This is the photo you cannot take later.
• Data plates and serial numbers. Boiler, cylinder, consumer unit, appliance or product labels, close enough to read in the photo. Needed for warranty registration and future parts.
• The reason for a variation. The corroded section of pipe, the rotten joist, the missing bonding. If you are asking the customer to pay more, show them why.
• After. The finished work and the area left tidy.

Name and file photos so they can be found months later

Attach photos to the job reference, not just the phone's camera roll, and add a few words where the image is not obvious: "flow pipe under bathroom floor, joint pressure tested before boards refitted". If you cannot get a useful photo, write a note saying why.

Agree extra work before you do it, and write the variation on the job sheet

Most job disputes come from extra work that was done first and discussed later. Once a customer has accepted a quote, Citizens Advice tells homeowners a trader can only charge more if the customer asks for extra work, agrees to extra work the trader says is needed, or the trader made a mistake writing down or calculating the price. "We found more than we expected" only gets paid if the customer agreed to it before you did it. Our variation form template for trade jobs gives you one page for each change, with the price, who approved it and how, and a log that keeps the final invoice in line.

Get customer sign-off that confirms what was done, not just that you turned up

A signature under "job complete" is weak if the job sheet above it is empty. Sign-off is useful when the customer confirms a specific description: the work carried out, the variations they agreed and anything outstanding. Show them before they sign.

When the customer is not there, as with many landlord and agent-managed jobs, email the job summary and photos the same day and ask them to reply if anything is wrong. That gives you a dated written record that they were told.

Sign-off does not replace any certificate, and it does not remove the customer's consumer rights if the work later proves faulty. It confirms facts; it is not a waiver.

Hand over the certificates and compliance paperwork the customer is owed

Plenty of trade work in homes is covered by building regulations. GOV.UK's examples include replacing fuse boxes and connected electrics, a bathroom involving plumbing, installing or replacing a heating system, adding radiators, replacing windows and doors, and replacing roof coverings. The job sheet should show which documents each job needs and who issues them, because "I thought the office sent it" is how certificates go missing.

Competent person schemes let registered installers self-certify the work

GOV.UK explains that an installer registered with a competent person scheme can self-certify that certain work complies, instead of the customer applying for building regulations approval. If needed, the installer tells the local authority on the customer's behalf, and the customer should get a certificate within 8 weeks of completion, which also shows up in solicitors' searches when the home is sold. The government list of schemes includes APHC, Certsure (trading as NICEIC), NAPIT, OFTEC, HETAS, Fensa, CompetentRoofer and others, each covering different types of work.

On the job sheet, add a "notification due" field with the scheme, the date submitted and when the customer's certificate is expected, so the office can answer when the customer asks.

Gas work: Gas Safe registration and building regulations notification

HSE says anyone employed to work on gas appliances in domestic premises must be a Gas Safe registered engineer and competent in that area of gas work. For building regulations, GOV.UK lists Gas Safe Register as the route for gas combustion appliances and notes that, while it is not technically a competent person scheme, its installers have the same responsibilities for complying with building regulations. So a boiler swap is normally notified through the engineer's Gas Safe registration and the customer receives a compliance certificate. Gas Safe Register's own guidance sets the current notification steps and deadlines, so check it before relying on this summary.

Electrical work: installation certificates and a Building Regulations compliance certificate

Electrical Safety First says that in England and Wales most fixed electrical work in homes must comply with Part P of the Building Regulations, and that apart from some minor tasks it must either be reported to building control or carried out by an electrician registered with a government-approved scheme. When a registered electrician finishes, the customer should receive an Electrical Installation Certificate or Minor Works Certificate confirming the work meets BS 7671, and a Building Regulations Compliance Certificate. Certificate forms change with amendments to the wiring regulations. NICEIC says that from 15 October 2026 new electrical work should conform to Amendment 4:2026, and only Amendment 4 forms will be available from that date, so check your forms or software are up to date.

Landlord gas safety records are a separate document

A job sheet is not a gas safety record. HSE says landlords must have an annual gas safety check carried out by a Gas Safe registered engineer, keep the record for at least 2 years, give existing tenants a copy within 28 days of the check and give new tenants a copy before they move in. If you do landlord work, the job sheet should note that the record was completed and sent, but the record itself is its own document.

Record commissioning, Benchmark and warranty details while you are still on site

Manufacturer warranties often depend on paperwork done at installation. For gas boilers, the Benchmark commissioning checklist supplied with the appliance is the usual record. The Heating and Hotwater Industry Council has said that completing it is a means of meeting the commissioning requirements in Part L of the Building Regulations. Manufacturers can also make it a warranty condition. Baxi's boiler warranty information, for example, says that if the warranty is not registered within 30 days of installation, the installer does not complete the Benchmark checklist, or the boiler is not serviced every year, the warranty reverts to the standard one year. Other manufacturers set their own terms, so check the product you fitted.

The job sheet does not replace the commissioning record. It should show the record was completed and left with the customer, the serial number, and who registers the warranty by when. Warranty registration often falls between engineer and office, so give it a named owner.

The same applies outside heating: roofing and window guarantees and product warranties on showers or pumps often need registration or dated proof of installation.

Write down materials used and what came off the van so invoices and stock match

Materials are where small amounts of money quietly leak. Fittings and sealant taken from the van and never recorded are not charged or replaced, so the next job is short of them.

• Record each item used with quantity, and mark whether it came from van stock or was bought for this job.
• Keep merchant receipts or order numbers against the job reference, so the office can match supplier invoices.
• Note parts returned unused or taken back to the merchant, so they come off the customer's bill.

If engineers record materials on the job sheet, the office can see what each van should be short of without counting it, and top-ups can follow a short standard stock list.

Illustrative example: a consumer unit upgrade that found extra work

This is an invented scenario to show the job sheet in use. Prices are made up for the example and are not a guide to what this work costs.

An electrician has a quote accepted for replacing an old consumer unit in a 1960s semi-detached house with a new unit with RCD protection: £680 plus VAT, quote Q-1142 version 2. The brief says the homeowner works from home, parking is on the drive, the meter cupboard is under the stairs and the customer, who is also the approver, is reachable by text.

They photograph both, note the findings on the job sheet and explain to the customer why bonding needs sorting as part of the upgrade. They send a text:

The customer replies YES at 10.42am. The job sheet records the variation, the reply and the time.

Later, the electrician sees an old loft cable with damaged sheathing, outside this job. They photograph it and recommend a separate visit. The customer will think about it, so the job sheet records the recommendation and "declined for now".

At the end, the job sheet shows the work done, materials from van stock, the approved variation, before and after photos, the new unit's model and serial number, the Electrical Installation Certificate handed over, the scheme notification marked "submitted today" and the customer's signature against the description. Status: complete, ready to invoice. The office invoices £680 plus variation 1 at £160, both plus VAT, that afternoon without ringing the electrician once.

Hand the job back to the office with a clear status, so it reaches the invoice the same week

"Done" is not a status. The office needs to know whether to invoice, chase a part, wait for approval or book a return. Use a few plain statuses and make the engineer choose one:

• Complete, ready to invoice: all work done, materials and variations recorded, certificates handed over or owned.
• Attendance complete, follow-on work awaiting approval: the visit can usually be invoiced on its own, but the further work cannot.
• Awaiting parts: who ordered, what, and when the customer was told.
• Return visit needed: why, and how long it will take.
• Unable to complete: what stopped the job, such as no access or an unsafe situation found.

Agree what "ready to invoice" means in your business

The invoice-ready point is when the office has everything it needs without asking anyone: quote version, work done, materials, approved variations, photos and certificate status. Writing that down as a short checklist stops half-finished job sheets reaching the invoice and finished jobs sitting for a fortnight. The getting paid guide picks up from there: sending the invoice promptly, payment terms and chasing.

Review returned job sheets once a day

Each morning, one person goes through every job sheet returned the day before. Anything missing goes back to the engineer as a specific question with a deadline: "Was the second pump fitted or returned to the merchant?" is answerable; "finish your notes" is not. The office should never fill in findings or approvals from memory, or sign a certificate for the engineer.

Look after customer photos and details the way data protection law expects

Job sheets contain personal data: names, addresses, phone numbers, access codes, and often photos of the inside of someone's home. The ICO's data minimisation principle says personal data must be adequate, relevant and limited to what is necessary for the purpose, and that you must not collect personal data on the off-chance it might be useful later. Its storage limitation principle says you must not keep personal data longer than you need it, and that you should be able to justify how long you keep it.

In practice for a trade business:

• Photograph the work, not the people or the house. Avoid faces, family photos and post left on the side.
• Keep job photos in the business system or a business account, not in an engineer's personal camera roll or a family cloud backup.
• Getting permission to photograph the job is not permission to post the photos on social media. Ask separately, and leave out anything that shows where the customer lives.
• Decide how long you keep job records and photos and why (for example, warranty claims), then delete old ones on that schedule.
• Remove engineers' access to job records when they leave.

The ICO says this guidance is under review following the Data (Use and Access) Act, so check its current version.

Paper job sheets or a job app: which suits your business now

A paper job sheet in a duplicate book works if one or two people do the jobs, the office collects sheets daily and photos go to one shared place. It fails when sheets live in the van for a week or photos sit on three phones and never reach the job.

A job management app helps when you need the brief on the engineer's phone, photos attached to the job automatically and the office seeing finished jobs as they arrive. Before paying, test it against the field list above on your team's phones: a job with no signal, a variation approved by text, a return visit, and exporting your records. The software guide covers what to test before you buy.

Guides in this section

Shorter guides that go deeper on one part of recording jobs on site.

Variation form template for trade jobs: agree extra work before you do it

A one-page form for extra work, credits and swaps, how to price and word a change, who has to approve it, a filled-in bathroom example and a log that makes the final invoice add up.

Job sheet template: eight fields for every trade visit, with a filled-in example

The eight fields that let the office invoice without ringing site, the extra fields for gas, electrical and building work, a filled-in roofing example, a two-week trial and how long to keep the sheets.

Use the free software checklist, then read the getting paid guide

Free tool

Trade business software checklist: know what you need before you book a demo

Turn the job sheet fields into the list any job app has to pass before you pay for it.

Get the checklist

Read next

How UK trade businesses invoice promptly, set payment terms and chase late payment to get paid faster

Picks up once the job is ready to invoice: sending the invoice promptly, payment terms and chasing late payment.

Read the guide

Sources checked for this guide

Job record, certificate and data protection points checked against official guidance. The routines and the example in this guide are our suggestions, not legal requirements. Official sources are summarised, and the rules for your trade and location may differ.

• GOV.UK: Building regulations approval
• GOV.UK: Use a competent person scheme
• GOV.UK: Competent person scheme, current schemes and how schemes are authorised
• HSE: Gas safety, home owners
• HSE: Gas safety, landlords and letting agents
• Electrical Safety First: Part P of the Building Regulations
• Electrical Safety First: Building Regulations in England, Wales, Scotland and Northern Ireland
• NICEIC: Certification and reporting
• EUA: HHIC launch updated Benchmark boiler commissioning checklist
• Baxi: What is Benchmark?
• Citizens Advice: Before you get building work done
• ICO: Data minimisation
• ICO: Storage limitation
• HSE: Gas safety check records
• Baxi: Boiler warranty information