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Construction Densification Challenges

Moad Ziadi, Director Of Construction Projects Europe, Urw

Construction Densification ChallengesMoad Ziadi, Director Of Construction Projects Europe, Urw

Urban densification is becoming more and more necessary in the real estate field. Urban extension is a vicious cycle as new greenfield projects require additional connections (roads, networks, …) and more public infrastructures (schools, administration offices, …). It also increases soil artificialization and contributes to a higher risk of flooding, impacting the biodiversity and significantly decreasing the volume of farming lands and wild vegetations.

The existing assets in western Europe are often dilapidated because they were built during the 60’s or the 70’s, right after the economic recovery that followed the second world war. The majority of those constructions built during that period are loaded with asbestos and lead. These unwanted toxic materials require specific care and a significant cost to be removed and depolluted. On top of that, the energy upgrading required by new regulations adds new construction market niches, promoted by the states in return of tax facilities. All these

factors are contributing to a real construction cost increase, impacting the capex and the projects’ financial feasibility for the refurbishment and densification of existing assets.

Moreover, the urban densification for retail, offices and hotel projects is nowadays a key success factor for better business development. In fact, these types of projects are fully linked to urban connections. They also act as a leverage for public transportation networks and main city facilities, and they upgrade rentability levels and assets’ value.

In the other side, urban densification is promoting greener construction processes. It considers the use of a bigger part of existing foundations and structural frames to avoid increasing steel and concrete quantities, which constitute the main factors contributing to the carbon footprint. The urban densification is also the main driver for better circular economy as the use of the existing elements extends the material lifecycle and ensures the reuse - without transformation - of the materials kept on site.

While the developers and public authorities are encouraging urban densification, the construction actors should leverage this opportunity to fulfil the clients expectations. As a matter of fact, and considering my experience in the past twenty years as a professional in the construction industry and as a real-estate construction advisor, I feel that the Covid-19 crisis should be used by the construction stakeholders to face the large demand on urban densification, taking place in the economy’s post-recovery phase, of which plenty of construction technologies are still to be enhanced.

Firstly, the challenge for Architects, of integrating existing buildings to be refurbished and extended, is adding more complications to their task. This requires from architects to be more creative, ensuring design compliance with regulations such as fire egresses and taking into account the existing building layout. Quite often existing buildings are not compliant with current regulations. And just to spice it all up, architects should consider the client cost expectations and offer smart, good-looking and modern buildings.

Secondly, Consultants and Engineering firms always consider dealing with existing structures to be a hard task. Sometimes after undressing an old building, the expected structural assumptions are very different from what they actually discover during the onsite surveying process. Redesigning, or adapting the design to the new discovered situation, turns out to bea very hard task for Engineers even if the discovered site solution is advantageous to the project. 

Very often indeed, reshuffling part of the design signifies an annoying news for all construction stakeholders. Engineers should become more agile and flexible than they used to be, and the Construction technology industry should also develop new processes to invent more nondestructive surveys and thus limit as much as possible unwanted on-site surveys discoveries.

Third, Authorities should improve regulations to prevent falling into standards that don’t encourage sustainable development and impact economic feasibility. As an example, in some European cities, the local regulation states that basement carparks are not counted in building rights areas, however those located in upper structures are deduced from the developer building rights areas. This regulation choice increases the carpark construction costs up to 150% and contributes to an increase of the carbon footprint of up to 170%. This significant increase of cost and environmental impact is linked to the fact that underground carparks require the construction of a retaining structure, digging the earth, removing the excavated soil, dewatering, etc.

All these elements slow down the construction schedule, increase the site indirect costs and increase the project carbon footprint.

And finally, the construction contractors should invest more in their Methods Engineering departments, to implement better construction technologies and optimize site sequencing and scheduling, better site tools, better green materials and equipment. The contractors should drive all their suppliers and subcontractors, such as deep foundations companies, formwork industrials and others, to investigate into cutting edge methods and greener construction processes in order to achieve these objectives in difficult urban densification contexts.

All those previous processes will ultimately contribute into making Construction Professionals to become more valuable in everyone’s perception. This will make them one of real-estate key decision makers, thanks to the new challenges that urban densification will face in the post-Covid-19 world.

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