- Companies
- Specialist contractors
- Belfast
- Atommm Ltd
Atommm Ltd
- Company number
- NI721237
- Incorporated
- 13 Sep 20242 years trading
- Registered office
- 46 Hill Street, Belfast, BT1 2LB
- Nature of business
- Other specialised construction activities n.e.c.
Atommm Ltd is a 2-year-old private limited company registered in Belfast, company number NI721237, one of 110 specialist construction companies in Belfast. Its next accounts are due at Companies House on 31 May 2027, and the CT600 for the period to 31 August 2026 is due at HMRC on 31 August 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Atommm LtdOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
Financial snapshot, 2025
From the balance sheet at 31 August 2025, as filed at Companies House.
Where Atommm Ltd is registered
The registered office is in Belfast (BT1), in the Belfast local authority area, Northern Ireland. Show BT1 2LB on a map.
Other trade companies in BT1
- Atlas Property and Holdings LtdProperty developers
- Geohac LimitedGroundworks and demolition
- XM Vehicle Solutions LimitedMotor traders
- Shine Renewables NI LimitedElectricians
- The Rathstone Group LtdCleaning companies
- Chenyukeji LtdMotor traders
- Linnexttech Shop LtdMotor traders
- Techright Environmental Ireland LtdCleaning companies
Also registered at this address
17 other companies use the same registered office as Atommm Ltd.
- Ballynure Developments LimitedProperty developers
- Beechview Developments LimitedBuilders
- Best Maintenance Services LtdProperty developers
- Clarke Housing Group LtdPlasterers
- Coolhaven Developments LtdFinishing trades
- D McKay Construction LimitedBuilders
- Dun Contracts LtdBuilders
- Glenview Contracts N. Ireland LimitedBuilders
- JMC Property Developments LimitedProperty developers
- Lilley Workspace Solutions LtdFloor and wall tilers
- N & A Construction LtdBuilders
- Nuport Construction LimitedBuilders
- Nuport Developments LtdBuilders
- Nuport Homes LtdBuilders
- Nuport L & R LtdBuilders
- Orrson Homes LtdBuilders
- Scottsboro LimitedBuilders
What happens if Atommm 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 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jun 2027 to 30 Jun 2027 | £150 |
| 1 to 3 months late | 1 Jul 2027 to 31 Aug 2027 | £375 |
| 3 to 6 months late | 1 Sep 2027 to 30 Nov 2027 | £750 |
| More than 6 months late | From 1 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- NI721237
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 September 2024 (2 years ago)
- Registered office
- 46 Hill Street, Belfast, BT1 2LB
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 August (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 August 2025
- Last confirmation statement
- 12 September 2025
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Belfast
Other active specialist construction companies registered in Belfast.
- Aup Asset Ltd2016
- B-Mac Communications Ltd2014
- Bannview Construction Ltd2026
- Bay View Developments ( Ire) Limited2025
- BCL Industrial Concrete Floors Limited2014
- Beechfield Insulation Ltd2025
- Belfast Garden Rooms Ltd2023
- Belfast Paving Ltd2026
All specialist construction companies in Belfast · All trades in Belfast · Specialist contractors across the UK
Frequently asked questions
When are Atommm Ltd's accounts due?
Atommm Ltd's next accounts are due at Companies House by 31 May 2027 (in 230 days), covering the period to 31 August 2026.
When is Atommm Ltd's CT600 due?
The CT600 for the period to 31 August 2026 is due at HMRC by 31 August 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 June 2027.
Is Atommm Ltd still trading?
Atommm Ltd is listed as active on the Companies House register (checked 13 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 Atommm Ltd do?
Atommm Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Atommm Ltd?
Atommm Ltd was incorporated on 13 September 2024, 2 years ago.
What is the penalty if Atommm 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 Atommm Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 13 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.