Klasse Byg ApS
Private limited companyCVR 44493330SøborgActive
Klasse Byg ApS is a private limited company, based in Søborg, active in joinery installation, founded in 2023. Net profit rose 580% from 2024 to 2025, ending at DKK 284k. Equity grew to DKK 385k in 2025.
Key figures · financial year 2025
What has changed
calculated from recorded figures and datesFinancials: 2025 against 2024
- Gross profit rose 306% (2024 → 2025), to DKK 1.5m.
- Net profit rose 580% (2024 → 2025), to DKK 284k.
- Equity rose 279% (2024 → 2025), to DKK 385k.
Employees
- 1 more employees than a year earlier: 5 (07/2026) against 4 (07/2025).
Registrations, last 24 months
- 01/01/2025: Industry changed to Joinery installation (433200)
Calculated from the latest two annual reports in sequence and from registrations in CVR. A figure that is missing in either year gives no line, and we derive no figures.
Financial statements
Financial years 2024–2025 · amounts in DKK thousandEquity and net profit
| 2024 | 2025 | Change | |
|---|---|---|---|
| Revenue | not stated | not stated | – |
| Gross profit | 379 | 1,536 | +305.6% |
| Operating profit (EBIT) | 55 | 364 | +567.3% |
| Profit before tax | 54 | 364 | +572.1% |
| Net profit | 42 | 284 | +579.8% |
| Total assets | 248 | 670 | +169.8% |
| Equity | 102 | 385 | +278.9% |
| Liabilities | 147 | 278 | +89.3% |
| Cash and cash equivalents | 72 | 210 | +191.8% |
| Average number of employees | – | 3 | – |
Source: annual reports filed with the Danish Business Authority (XBRL). Figures for the company (not the group); change is the latest year against the year before. “–” means the figure is not stated in the annual report. Revenue is not stated for 2024, 2025: smaller companies may omit it, and we do not derive it from other figures.
Download the figures as CSV · free with an account, amounts in whole DKK
Annual reports
2 financial years| Financial year | Period | Published | Figures for | Documents |
|---|---|---|---|---|
| 2025 | 01/10/2024 – 30/09/2025 | 31/03/2026 | The company | PDF not statedXBRL |
| 2024 | 12/12/2023 – 30/09/2024 | 25/03/2025 | The company | PDF not statedXBRL |
The figures from all the annual reports are shown on this page. The documents themselves (PDF and XBRL, the machine-readable edition) are downloaded with a Pro account: sign in or create a free account, and then choose Pro. XBRL is the edition the figures on the page are read from.
Employees
monthly figures from CVRPosition in the industry
3,429 companies in the databaseComparison with the other companies in joinery installation based on the latest financial year.
Industry median: gross profit DKK 2m, net profit DKK 133k, equity DKK 623k, 4 employees.
Compared with similar companies
size, age and company form| Group | Gross profit | Equity |
|---|---|---|
| Companies with fewer than 20 employees69,967 companies in the comparison | No. 36,421of 69,742 Better than 48% | No. 44,903of 69,964 Better than 36% |
| Same industry and fewer than 20 employees3,046 companies in the comparison | No. 1,655of 3,045 Better than 46% | No. 1,706of 3,046 Better than 44% |
| Companies that are founded within the last five years16,662 companies in the comparison | No. 6,996of 16,614 Better than 58% | No. 6,590of 16,661 Better than 60% |
| All companies of type ApS66,508 companies in the comparison | No. 35,179of 66,379 Better than 47% | No. 40,824of 66,505 Better than 39% |
The rank is calculated among companies in the database with a figure for the latest financial year, and is shown only for groups of at least ten companies.
Compare with the industry
Joinery installation- Klasse Byg ApSDKK 1.5m
- Egil Rasmussen A/SDKK 370.7m
- Jakon A/SDKK 197.1m
- Klasse Byg ApSDKK 284k
- Egil Rasmussen A/SDKK 65.4m
- Jakon A/SDKK 66.1m
- Klasse Byg ApSDKK 385k
- Egil Rasmussen A/SDKK 212.5m
- Jakon A/SDKK 205.4m
- Klasse Byg ApS5
- Egil Rasmussen A/S523
- Jakon A/S446
Latest financial year per company. Choose up to three companies from the largest in the industry.
Owners and group
from the Public Ownership Register- Lasse Madsen Sieben50%
- Karl Thor Søndergaard50%
Management
1 active registrationsExecutive management
| Name | Role | Appointed |
|---|---|---|
| Lasse Madsen Sieben | Director | 12/12/2023 |
- Founders
- Lasse Madsen Sieben, Karl Thor Søndergaard
Signing rule: Selskabet tegnes af en direktør.
Address and production units
1 active production unitsTolstojs Alle 31
2860 Søborg
| Production unit | Address | Employees | P number |
|---|---|---|---|
| Klasse Byg ApS | Tolstojs Alle 31, 2860 Søborg | 5 | 1029915071 |
Purpose
Selskabets formål er at udøve virksomhed med handel og service samt aktiviteter i tilknytning hertil.
The purpose is quoted from the register in Danish.
Changes year by year
8 registered events20261 changeaccounts 1
- AccountsAnnual report for 2025 published
20252 changesaccounts 1 · industry 1
- AccountsAnnual report for 2024 published
- IndustryIndustry changed to Joinery installation (433200)
20235 changesaddress 1 · founded 1 · management 1 · ownership 2
- AddressMoved to Tolstojs Alle 31, 2860 Søborg
- FoundedRegistered as Klasse Byg ApS
- ManagementLasse Madsen Sieben appointed director
- OwnershipLasse Madsen Sieben registered as owner (50%)
- OwnershipKarl Thor Søndergaard registered as owner (50%)
Related companies
Same industry in Gladsaxe
- Kjell Pedersen Entreprise A/S53 employees
- Lauritz Hannibal ApS33 employees
- Nordliv Byg A/S22 employees
- Venson Byg ApS21 employees
- Gladsaxe Bygningsentreprise ApS15 employees
- Ig-byg A/S12 employees
Largest in the industry
- Egil Rasmussen A/SDKK 370.7m
- Jakon A/SDKK 197.1m
- Snedkermester Arne Pedersen A/SDKK 144.5m
- Deko P/SDKK 126.2m
- Bytømreren Service A/SDKK 99.2m
- Bgb A/SDKK 77m
Source and updates
The information comes from the Danish Central Business Register (Danish Business Authority) and from annual reports filed with the Danish Business Authority. Last synchronised 24/10/2026. The company is protected against advertising; contact details are not shown, and the data must not be used for marketing.