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- MMM511 Ltd
Company profile · Cleaning companies
MMM511 Ltd
MMM511 Ltd is a 8-year-old private limited company registered in Harrow, company number 11605519, one of 201 cleaning companies in Harrow. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 is due at HMRC on 31 October 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 31 October 2025, as filed at Companies House. Negative net assets mean the company owed more than it owned at that date.
MMM511 Ltd over the years
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £2,782 (-23.7%) on the year before, to -£15K.
- Net assets rose in 2 of 6 year-on-year comparisons on record.
- Current assets of £118 against £14K owed within a year: 0.0 times cover.
- 2 employees on average, up from 1 the year before.
- Balance sheets on record for 7 years, 2019 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Oct 2025 | -£15K | £102 | £118 | £14K | 2 |
| 31 Oct 2024 | -£12K | £102 | £516 | £12K | 1 |
| 31 Oct 2023 | -£409 | £4,178 | £4,532 | 1 | |
| 31 Oct 2022 | -£194 | £4,769 | £4,624 | 1 | |
| 31 Oct 2021 | -£3,638 | £980 | £4,618 | 3 | |
| 31 Oct 2020 | -£15K | £2,411 | £17K | 4 | |
| 31 Oct 2019 | £219 | £350 | £131 | 0 |
Where MMM511 Ltd is registered
The registered office is in Harrow (HA3), in the Brent local authority area, London. Show HA3 0AX on a map.
Other trade companies in HA3
- M&M Team Solutions LimitedCleaning companies
- Asr234 LimitedCivil engineering
- Shine Bright With NV LtdMechanics and garages
- Direct Sparks LtdMachinery repair and installation
- Meral Decoration & Maintenance LtdPainters and decorators
- Add22 LtdCivil engineering
- Floyd Cleaners LimitedCleaning companies
- Amalia&Ioana LimitedBuilders
Also registered at this address
4 other companies use the same registered office as MMM511 Ltd.
- Det Ol LtdCleaning companies
- Ivich Co LtdCleaning companies
- Pep76 LimitedCleaning companies
- Shining 91 LtdCleaning companies
What happens if MMM511 Ltd files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 31 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 11605519
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 October 2018 (8 years ago)
- Registered office
- 21 Churchill Avenue, Harrow, HA3 0AX
- Nature of business
- Window cleaning services (SIC 81221)
Other cleaning services (SIC 81299) - Year end
- 31 October (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 3 October 2025
Filing notes for cleaning companies
Cleaning companies are often staff-heavy, so wages, pension contributions and the employment allowance all show up in the accounts.
Similar companies in Harrow
Other active cleaning companies registered in Harrow.
- Moo’S Cleaning Ltd2026
- MPJ Clean and Care Limited2026
- MR Sparkle Ashford Ltd2025
- MR Sparkle Mobile Valeting Ltd2026
- Nature's Best Cleaners Ltd2026
- NC Morgan Limited2026
- Offshore Task Accounting Services Limited2022
- Old Bills Pest Control Limited2017
All cleaning companies in Harrow · All trades in Harrow · Cleaning companies across the UK
Frequently asked questions
When are MMM511 Ltd's accounts due?
MMM511 Ltd's next accounts are due at Companies House by 31 July 2027 (in 292 days), covering the period to 31 October 2026.
When is MMM511 Ltd's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is MMM511 Ltd still trading?
MMM511 Ltd is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does MMM511 Ltd do?
MMM511 Ltd is registered under Window cleaning services (SIC 81221); Other cleaning services (SIC 81299).
How old is MMM511 Ltd?
MMM511 Ltd was incorporated on 4 October 2018, 8 years ago.
What is the penalty if MMM511 Ltd files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View MMM511 Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.