Energy certifications and efficiency in construction

Since the latest updates to the Technical Building Code (CTE) came into force, specifically the Basic Document on Energy Saving (DB-HE), energy certifications and efficiency in construction have ceased to be a mere bureaucratic formality and have become a determining factor in the profitability of any project. For a construction company, energy efficiency does not just mean achieving a label from A to G; it involves managing more complex budget line items, controlling the traceability of specific materials, and ensuring that on-site execution exactly matches the design to avoid penalties or costly remedial work before handover.

Current regulations in Spain, aligned with European directives for Nearly Zero-Energy Buildings (NZEB), demand rigorous control of the thermal envelope, HVAC installations, and airtightness. If the site manager does not correctly supervise the installation of an ETICS system (SATE) or the sealing of thermal bridges, the final energy efficiency certificate may differ from the design stage, creating legal and financial issues with the developer.

The impact of energy efficiency on cost control

When we talk about efficiency in construction, the first direct impact is reflected in the bill of quantities by work packages. The materials required to reach high efficiency levels (thicker insulation, low-emissivity glass, aerothermal systems, or heat recovery) have a higher unit cost than conventional solutions.

However, the real risk for the contractor does not lie in the purchase price, but in the management of deviations. An error in measuring the envelope or a poor choice of a substitute material that does not meet the required thermal transmittance (U-value) can force the dismantling of work units that have already been executed.

Common deviations in efficiency work packages

1. Substitution of materials without technical validation: Changing one mineral wool for another with different thermal conductivity to save costs can invalidate the building's energy calculation.
2. Unspecialised labour: Installing systems such as Passivhaus requires specific training in airtightness. Extra hours spent correcting air infiltrations detected in a Blower Door test usually eat into the profit margin of that work package.
3. Management of insulation waste: In high-efficiency projects, the volume of insulating material is much higher. Poor control of waste and breakages on-site leads to a direct increase in the cost of the facades and roofing chapters.

Mandatory energy certifications vs. voluntary seals

It is essential for the construction company's technical team to distinguish between the mandatory Energy Efficiency Certificate (CEE) and voluntary sustainability seals. Each requires a different level of documentation and site control.

The Energy Efficiency Certificate (CEE)

This is the official document that rates the building on a letter scale. The contractor must ensure that what is built matches the project so that the certifying technician can sign the final certificate of completion. Any changes to the installations or the envelope must be recorded in the building logbook and validated by the project management team.

BREEAM, LEED, and Passivhaus seals

If the project is subject to international certifications such as BREEAM or LEED, the administrative burden for the contractor multiplies. These certifications do not only measure energy consumption but also the origin of materials, construction and demolition waste (CDW) management, and water consumption during construction.

To manage this without administrative costs skyrocketing, a centralised document management system is necessary. Tools like Presto for budgeting or Constrack for cost control and on-site documentation allow the site manager to upload certificates of origin for timber or technical data sheets for low-VOC (volatile organic compound) paints instantly, avoiding documentary chaos at the end of the project.

The importance of documentary traceability on site

Energy efficiency is proven with paperwork. It is not enough to install the best insulation on the market; you must prove that that specific model was installed in the planned quantities.

During an inspection or to obtain the final certification, the following will be required:

• Technical data sheets and CE marking for all insulating materials, joinery, and glazing.
• Installation certificates for HVAC equipment and renewable energy systems (photovoltaic panels, aerothermal).
• Photographic reports of critical points that will remain hidden, such as the treatment of thermal bridges in pillars or roller shutter boxes.

Losing a delivery note or a technical sheet can delay the final project certification and, therefore, the developer's final payment. Digitalising this documentation through construction management software allows any document uploaded from a mobile phone by the foreman to be immediately available to the administrator in the office.

How to control operating costs in high-efficiency buildings

Efficient construction requires slower and more meticulous processes. This directly affects the project schedule and personnel costs.

Planning critical tasks

The order of execution is vital. For example, in buildings with high airtightness standards, the chases for electrical installations must be executed and sealed before closing the wall linings. If the electrician arrives late or without the proper instructions, they will break the airtightness barrier, forcing expensive repairs.

Control of machinery and consumption

Efficiency must also be applied to the execution of the work itself. Controlling the costs of machinery and vehicles is a chapter that is often neglected. A poorly maintained fleet of machinery or inefficient use of lighting towers and generators increases the project's overheads. Using specialised software allows these costs to be assigned to each work package to know exactly where money is being lost.

Technical challenges in execution: Thermal bridges and airtightness

For energy certifications and efficiency in construction to be favourable, the contractor must pay special attention to points where the envelope is interrupted.

1. Joinery junctions: The use of airtightness tapes and high-density polyurethane foams is now the norm. The cost of these auxiliary materials is small compared to the labour cost required for their correct application.
2. ETICS (External Thermal Insulation Composite System): This is one of the most effective solutions but also one of the most sensitive. Facade starts, corner reinforcement, and sealing around window frames are points where pathologies often appear if drying times and application temperatures are not controlled.
3. Installations: Efficiency depends on equipment working within its optimal ranges. Poor execution of insulation for domestic hot water (DHW) pipes or ventilation ducts with heat recovery cancels out much of the planned energy savings.

Management tools for efficiency control

The market offers various solutions so that construction companies do not lose control over these processes. For calculation and design, tools like CYPE or the unified LIDER-CALENER (HULC) program are the standard in Spain. However, for the execution and cost control phase, the situation changes.

Many companies still rely on complex spreadsheets that are not updated in real-time. This is a risk when managing budgets where the profit margin can be affected by a rise in the price of insulating materials or a delay in the delivery of specific machinery.

Solutions like Procore (for large corporations) or Constrack (designed for SMEs in the sector across Spain and LATAM) allow for the integration of budget control by work packages with document management and personnel control. This makes it easier for the construction manager to see, at a glance, if the "Insulation and Waterproofing" chapter is staying within budget or if the personnel hours assigned to airtightness are exceeding what was planned.

Efficiency as a competitive advantage for the contractor

Despite the operational difficulties, specialising in high-efficiency construction offers a clear competitive advantage. Developers look for contractors who understand the regulations and do not generate problems during the final certification phase.

• Fewer post-sale snags: A well-insulated building without thermal bridges generates fewer claims for condensation or dampness, reducing warranty costs for the contractor.
• Access to public tenders: Increasingly, tender specifications award points for experience in energy certifications and environmental management on site.
• Improved brand image: Being able to deliver projects with Class A certification or international seals positions the company in a higher value-added market segment.

Conclusion

Managing energy certifications and efficiency in construction requires a precise balance between technical rigour and cost control. It is not just about building structures that consume less, but about doing so in a way that the company maintains its profitability. The key lies in anticipation: understanding the requirements of the CTE, planning critical tasks to avoid execution errors, and, above all, digitalising documentary and financial management to avoid money leaks in items that have not been correctly supervised.

To maintain exhaustive control over every work package, from materials to personnel performance, it is essential to have tools that centralise information and eliminate dependence on paper and WhatsApp groups. At Constrack, we help construction companies digitalise their management processes simply, allowing real control over the profitability of each project. If you are looking for a more efficient way to manage your sites, you can try our platform for free for 14 days and see how it improves the tracking of your budgets and technical documentation.