
LJ BUILDING ENGINEERING LLC intervenes as a project manager in all technical fields of the building industry. Recognized for our expertise, we propose creative engineering and a partner for the success of your projects.
We carry out design studies on all types of buildings (schools, nursing homes, housing, offices, etc.) in the fields of climatic engineering and electricity. Our teams of experts integrate innovative and proven technical solutions. They elaborate on all the written documents, APS, APD, PRO, and DCE. We accompany our customers and partners in the follow-up of the building sites until the reception.
Within the framework of the mission of new conception or rehabilitation, we propose various services such as:
- Thermal balance Regulation RT2012 & RT Renovation.
- Feasibility study
- Certificate of consideration of the thermal study for the filing of the building permit.
- Certificate of consideration of the thermal study for the end of the work.
- Define the needs in HVAC & plumbing and electricity.
Proposal of technical and economical solutions.
Design of HVAC and plumbing network plans on AUTOCAD and REVIT.
Sizing of air, hydraulic and plumbing networks.
Sizing of air handling units (AHU), fan coil units, radiators, etc…
Drafting of written documents (CCTP, DPGF) for the lots: HVAC & plumbing and electricity.

Studies Execution

With experience in terms of Execution, acquired in various sectors of activity, the LJ BUILDING ENGINEERING LLC team is able to offer you solutions for the study, design, and execution of your projects in HVAC engineering and electricity.
This experience in site execution makes it possible to anticipate, ensure responsiveness and optimize the progress of your sites, with the overall objective of responding to changes in the building sector.
In order to meet all the needs of our customers, LJ BUILDING ENGINEERING LLC carries out both 2D and BIM (3D) studies.
We have the most powerful tools (Autocad, Revit, Plancal 3D, Dialux, Caneco,….) to carry out execution studies in HVAC engineering and electricity.
LJ BUILDING ENGINEERING LLC offers various services such as:
Calculation note
- Regulatory heat balance RT.
- Calculation of losses and contributions.
- Calculation of aeraulic and hydraulic networks.
- Calculation of plumbing networks.
- Calculation of smoke extraction networks.
- Selection of HVAC equipment (pump, CTA, etc …).
- Notes of electrical calculations.
- Notes of illuminance calculations.
Execution plans on Autocad and Revit
- Booking plans.
- Boiler room plan
- HVAC & plumbing plans.
- Smoke extraction plans.
- Cutting plans and details.
- Plans of technical rooms.
- Terminal maps.
- On-site surveys.
- Realization of plans in Autocad or Revit format from handwritten surveys and plans.
- Participation in summary meetings.
Schematic diagram
- Aeraulic and hydraulic schematics
- Plumbing diagram.
- EF-EU-EP column diagram.
- Diagram of principle smoke extraction.
CFO-CFA schematic diagram.
Price studies

With great experience in costing, LJ BUILDING ENGINEERING LLC responds to different projects: housing, tertiary, high schools, etc … Our team’s function is to estimate the costs of the work at the fairest price, on the basis of costing and quantity surveys, and other graphic and written documents.
- Analysis of written documents: CCTP, Safety Notice, PC Orders, etc …
- Consultation with suppliers and subcontractors.
- On-site visit, in case of renovation or rehabilitation, to check accessibility and carry out the readings (technical rooms, equipment,….) necessary for a good understanding of the cost.
- Establishment of quantity surveying according to ELD plans and/or on-site surveys.
- Price schedule (DPGF) established in Excel format but allowing direct transformation into customer format. This transformation is carried out automatically according to the coefficients applied to the many available criteria (Labour, Subcontractors, Supplies, etc.). This document is systematically sent by email at the end of the studies.
- Writing technical brief.