Construction & trades
MTD software for window and door installers.
Fit the frame. Keep the figures straight.
Surveys, delivery slots and fitting days leave little space for sorting invoices. Avona helps independent window and door installers bring their sales, supplier bills and day-to-day costs together.
- Who it is for
- Window and door installers working as sole traders, managing their own business records and MTD for Income Tax updates.
- Available now
- Digital records, bank feeds, statement imports, transaction categorisation and quarterly self-employment updates. Pro adds customer invoicing, VAT accounting and reporting.
- Monthly price
- From £15/month for Lite. Pro is £20/month.
- Free trial
- Full access for 7 days. No credit card required.
- Annual-return limitations
- Quarterly updates do not replace your annual tax return. HMRC lists annual-return items including PAYE income, interest, dividends and pensions as in development. Check the listing and confirm support for your income sources before relying on Avona for your annual return.
Making Tax Digital
It’s what comes in.
Before costs go out.
Frames and glazing sold within a fitting contract contribute to your sales. Deducting the supplier’s bill before recording the customer payment can hide the true scale of the job.
Understand Making Tax Digital →When does MTD apply?
Combined qualifying self-employment and property income, before expenses:
- Over £50,000 in 2024/25
- From 6 April 2026
- Over £30,000 in 2025/26
- From 6 April 2027
- Over £20,000 in 2026/27
- From 6 April 2028
Eligibility and exemptions matter. These are income thresholds, not tax-free allowances.
Check HMRC’s eligibility guidance ↗From the work to your records
Clear records for your window replacement.
Bring the evidence into Avona, review the suggested categories and check the figures before submitting. These three examples show the records behind your window replacement, shared purchases and payments for a window-installation contract.
| What you bring | How you use Avona | What you check |
|---|---|---|
| £1,500 for your window replacement £620 spent on frames, glazing and fitting supplies | Connect your bank or import the payment, then upload the invoice or receipt for frames, glazing and fitting supplies. Review the income and the purchase as separate records. | Keep £1,500 as the sale and the £620 cost separately. The £880 left after this cost is not turnover. Check that the spending is eligible for your business. |
| £100 mixed purchase £80 for sealants for a customer installation; £20 for sealant for a repair at home | Upload the itemised receipt and review the suggested category. Identify sealants for a customer installation separately from sealant for a repair at home. | Only the eligible £80 business portion belongs in business costs. Exclude the £20 personal purchase, and check that importing both the bank transaction and the receipt has not counted the spending twice. |
| £200 received, then £400 £600 of agreed fees covered by the payments | Keep the supporting invoices and payment breakdown for payments for a window-installation contract. Match each receipt to the work it settles during your review. | Together the receipts settle £600. Do not count the same invoice and payment twice. Keep unpaid balances and any credits identifiable, and follow your accounting method for when income is recorded. |
Keep supporting documents alongside your figures, review business use and apply your accounting method consistently. HMRC: keeping business records ↗
The costs behind your work
Six expenses worth
keeping records for.
Examples for window and door installers. Claim only eligible business costs; mixed use, equipment and your accounting method can change the treatment.
Frame fixings
Sealants and packers
Glazing tools
Access equipment hire
Business delivery travel
Protective workwear
One thing to watch
Track changes to the original order
A customer upgrade or replacement unit can produce a revised invoice and several payments. Keep the final order details with the earlier paperwork so the change is clear during your review.
HMRC: keeping business records ↗Fit the admin around the work
A routine around your window replacement.
Gather the frame supplier’s invoice, upload fitting receipts and reconcile customer instalments against the completed installation.
Capture the supporting documents
Upload receipts or invoices for frames, glazing and fitting supplies. Keep the date, supplier and amount legible, and distinguish sealants for a customer installation from sealant for a repair at home.
How document capture works →Reconcile your window replacement payments
Review each customer receipt against the work it covers. Keep the breakdown for payments for a window-installation contract available alongside the bank entry, so fees, refunds or timing differences can be explained.
How bank review works →Review before you submit
Review Avona AI’s suggested categories, check that your window replacement income is complete, and remove duplicate or personal spending. Keep the evidence for payments for a window-installation contract ready for your annual-return review too.
Before you get started
Questions from window and door installers.
Does MTD apply to everyone in this profession?
No. This page covers window and door installers working as sole traders. Your start date depends on combined qualifying self-employment and property income before expenses, and any exemptions. Employment and limited-company work have different reporting arrangements.
What if a replacement unit arrives under warranty?
Retain the supplier's replacement paperwork and any related credit. Do not invent a second purchase cost for a unit supplied without a new charge.
How do I record payments for a window-installation contract?
Example: £200 received, then £400 (£600 of agreed fees covered by the payments). Together the receipts settle £600. Do not count the same invoice and payment twice. Keep unpaid balances and any credits identifiable, and follow your accounting method for when income is recorded.
Which bookkeeping issue should I watch for?
Track changes to the original order. A customer upgrade or replacement unit can produce a revised invoice and several payments. Keep the final order details with the earlier paperwork so the change is clear during your review.
Can I keep using my existing spreadsheet?
Yes. Bring your window replacement income records and evidence of frames, glazing and fitting supplies into Avona using supported spreadsheet uploads. Check dates, categories, personal spending and duplicates against the original documents before you approve the records.
Do quarterly updates complete my annual tax return?
No. You still need the annual tax return and any relevant adjustments or other income. HMRC currently lists annual-return items including PAYE income, interest, dividends and pensions as in development for Avona. Confirm support for your own income sources and circumstances before relying on Avona for the annual return.
Built for the way you earn
Bring your installation records into view.
Choosing Avona
Your questions, answered.
Can I create customer invoices?
Yes. You can create customer invoices with Avona Pro.
What if I am VAT-registered?
Full VAT accounting is available with Avona Pro, so you can manage your VAT-registered business with Avona.
Can my accountant review my records?
Yes. You can connect your Avona account to your bookkeeper or accountant so they can review your records.
Can I use my phone on site?
Yes. Every feature has a mobile-friendly version, so you can manage your accounts from your phone while you are on the move.
Can I keep using my personal bank account?
Yes. Avona supports Open Banking connections and PDF bank statement uploads. You can clearly separate personal and business transactions to keep your business records organised.