Platform on new construction, renovation, restoration and transformation
In early 2020, housing corporation Rochdale started the renovation and improvement of the homes in the Dobbe neighborhood in the Van Eesteren Buitenmuseum in Amsterdam New West. Coen Hagedoorn Bouwgroep was awarded the contract for the renovation of the 189 homes in the Holt blocks, divided into 3 blocks and 24 porches. To increase construction efficiency and speed up delivery, the work will be carried out one porch at a time. Of 48 homes, the upper attic will be added to the home, creating four- to seven-bedroom homes. The project will be completed in the fall of 2022.
The homes in the Dobbe neighborhood date from the 1950s and were in urgent need of renovation. After a preselection, Coen Hagedoorn Bouwgroep and two other contractors were asked to develop a Plan of Action for the 189 houses of the Holtblokken. By unanimous vote, the construction company with branches all over the Netherlands was selected to carry out this project. After all, the interests of all stakeholders were incorporated into the plan and it was also innovative.
Instead of housing out, emptying, gutting and rebuilding the apartments per block, they proposed to work porch by porch, under the name Triple P. This way, not all the residents of a block have to go to the exchange apartments at the same time, and the first apartments can be delivered after about 5 months, as opposed to 12 months when renovating per block. Moreover, adjustments can also be made during the construction process. Anything that could be improved in the first portico will be implemented in the renovation of the third portico. It was agreed with the construction partners to tackle a maximum of two porches at a time.
"Rochdale had indicated that they wanted to add the 48 upper attics to the homes to create larger homes. We modified the initial sketches to maintain the existing structure. Instead of increasing the floor area, the existing building walls are raised and the available area can be better utilized," explains Maarten Slob, project manager at Coen Hagedoorn Bouwgroep. "We worked out everything down to the smallest details in the construction team, supplemented by Kramer's Houtconstructies and Broeke Steigerbouw. For example, the existing roof is being removed, which creates the risk of water and other damage during the construction phase. To prevent that, we developed an ingenious system with a temporary canopy on rails."
This renovation project is closely related to new construction and only through good communication between the construction partners and with the residents can it be successfully completed. By delivering the plastic window frames turnkey with frame frames and HR++ glazing on site, the homes are watertight faster. Facade insulation with stone strips is used and balconies are cut and replaced. The homes are completely gasless, will be connected to district heating and carry the A+ label.
"By the way, Rochdale wanted to work with BIM. With new construction that's almost a no-brainer, but with renovation it's different, because you're dealing with an existing shell. Our specialists came up with some practical applications of BIM. For example, prefabricated elements, such as the hoods and balconies, but also the installation walls for the meter cupboard, in the kitchens and in the toilets were worked out in BIM," Slob concludes. "The first porch has been successfully completed and the residents have moved in, while we are still working in the other porches of the block. The project will be completed in the fall of 2022."
Construction Info
Client Rochdale, Amsterdam
Main contractor Coen Hagedoorn Construction Group, Amersfoort
