The verdict in three sentences
An online store for a string instruments dealer that works with music services, schools and pupils' families is unlike a standard shop: it must run rent to own plans, instrument sizes that change as children grow, school accounts paid on invoice and fitting appointments in the workshop. The market budget runs from GBP 15,000 to 40,000 (2026 ballpark) for 10 to 16 weeks of work. A specification with measurable requirements stops you paying later for features nobody wrote down.
The dealer's context
The illustrative business is a workshop and showroom in North London that makes, restores, sells and rents bowed string instruments: violins, violas, cellos and a few double basses, plus bows, cases and strings. Its rental fleet is around 350 instruments, from 1/16 size for a four year old to full size 4/4. Families rent in September, swap sizes every 1 to 2 years and often buy after a few years, with part of the rent credited towards the price.
Schools, academies and local music services order fleets of instruments and repairs on purchase orders and pay on invoice, typically on 30 day terms. Advanced players and conservatoire students want to try several instruments in the workshop before buying. One legal point needs checking early: depending on how the plan is structured, a rent to own agreement with consumers can count as regulated credit under FCA rules, so the contract wording should be reviewed before launch.
The specification template
Every requirement must be testable at acceptance. Fill in the Target column with your own numbers.
| Ref. | Requirement | Measurable criterion | Target | Priority |
|---|---|---|---|---|
| C1 | Catalogue by instrument and size | Filter by instrument, size 1/16 to 4/4, grade level | Right size found in 3 clicks or fewer | Must have |
| C2 | Size guide | Guide by age and arm length | Viewed before 50 % of rentals | Should have |
| L1 | Rent to own plan | Online agreement, monthly Direct Debit, running credit balance | Sign up in under 10 minutes | Must have |
| L2 | Size swap | Online request, appointment, new agreement linked to the old one | Handled within 5 working days | Must have |
| E1 | School and music service accounts | Quotes, purchase orders, invoices on 30 day terms | 100 % of invoices issued without rekeying | Must have |
| R1 | Workshop fitting appointments | Pick 1 to 5 instruments to prepare, 45 minute slot | Instruments ready when the player arrives | Should have |
| P1 | Payments | Card, Direct Debit for rentals, bank transfer for schools | Failed Direct Debits retried automatically | Must have |
| S1 | Data and security | Bank details and pupil data protected under UK GDPR | Role based access, access log | Must have |
The specification also states volumes (350 instruments on rent, 150 to 400 products for sale), the standard rental agreement, credit rules and the accounting software to connect.
Sample rental grid and budget by release
| Instrument and size | Typical age | Monthly rent (2026 ballpark) | Credit towards purchase (example) |
|---|---|---|---|
| Violin 1/16 to 1/4 | 4 to 7 | GBP 12 to 16 | 50 % of rent paid |
| Violin 1/2 to 4/4 | 7 and over | GBP 15 to 25 | 50 % of rent paid |
| Viola 13 to 16 inch | 10 and over | GBP 20 to 30 | 50 % of rent paid |
| Cello 1/4 to 1/2 | 6 to 11 | GBP 30 to 40 | 40 % of rent paid |
| Cello 3/4 to 4/4 | 11 and over | GBP 38 to 50 | 40 % of rent paid |
| Release | Scope | Market budget (2026 ballpark) | Duration |
| Release 1 | Catalogue, sizes, product pages, payments | GBP 5,000 to 12,000 | 4 to 6 weeks |
| Release 2 | Rent to own and size swaps | GBP 4,000 to 12,000 | 3 to 5 weeks |
| Release 3 | School accounts and invoicing | GBP 3,000 to 9,000 | 2 to 3 weeks |
| Release 4 | Fitting appointments and data migration | GBP 3,000 to 7,000 | 1 to 2 weeks |
| Total | GBP 15,000 to 40,000 | 10 to 16 weeks |
As a nearshore option, Kolonell's prices for this type of store fall under the Premium tier, 3,050 to 5,340 EUR (2,000,000 to 3,500,000 FCFA), e-commerce or booking included and delivered in 21 to 30 working days, with booking at 340 EUR (225,000 FCFA) and a customer area at 230 EUR (150,000 FCFA). The rent to own engine is quoted separately as application work.
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Illustrative example: Hannah, owner of the North London workshop, rents 350 instruments at an average GBP 22 a month, GBP 92,400 a year. Paper agreements, card payments and chasing take 8 hours a week in September and October and 3 hours the rest of the year, about 190 hours at GBP 30: GBP 5,700. Direct Debit also halves arrears, estimated at 4 % of rent: GBP 1,850 recovered. On a GBP 26,000 build with GBP 3,500 a year in running costs, the direct gain of GBP 7,550 is not enough on its own; the 25 extra rentals per September she targets through online sign up add GBP 6,600 a year in rent plus future sales. The project pays back in 2 to 3 years, which Hannah accepts for a tool planned to last 7 to 8 years.
FAQ
How much does an online store with instrument rental cost in London?
The 2026 market ballpark is GBP 15,000 to 40,000 depending on fleet size and school accounts. The project takes 10 to 16 weeks.
How do we run rent to own online?
With an agreement signed online, a monthly Direct Debit and a running credit balance towards purchase. That release costs GBP 4,000 to 12,000, and the agreement wording should be checked against FCA consumer credit rules.
How do we sell to schools and music services?
Through business accounts that issue quotes, accept purchase orders and send invoices on 30 day terms. Plan 2 to 3 weeks of work.
Do we need sizes in the catalogue?
Yes, from 1/16 to 4/4 for violins and cellos, with a guide by age. A good filter finds the right size in 3 clicks.
When should we launch?
By June at the latest, to test rentals before September, which often brings more than half of the year's new agreements.
Let's scope your project. Send us your rental fleet, school customers and indicative budget, and we will quote the store release by release with a realistic timeline. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
