The temptation to reuse - 4 housing units in Colombelles

The goal was to build 4 innovative housing units from abandoned gardens… Low construction costs, low energy consumption, plots of recuperation! We try to foster reuse by mobilizing goodwill from lessor and companies. The result: comfortable, bright, economical and original houses!

The project consists of building 4 semi-detached individual dwellings in pairs. These are located on the ground floor, accessible to people with reduced mobility, made with a wooden frame and wooden cladding on the outside. Each accommodation consists of a main room including a kitchen and a sleeping area, as well as a bathroom and a bicycle room accessible from the outside.

The first virtuous approach of this project is to be part of the dynamic of densification of the city center of Colombelles by implementing the concept of “Build in my Backyard”.

The plot available for the project is the result of a new plot division and is located on the right-of-way of the gardens located behind the neighboring pavilions. These pavilions, also managed by Les Foyers Normands, are occupied mainly by elderly people. The gardens have become too large for the occupants and are neglected. The “Bimby” concept thus makes it possible to densify urban space by offering new housing while taking advantage of existing infrastructure and limiting urban sprawl.

These accommodations are intended for households of one or two people with very modest incomes. The cost of construction must be limited so that the rents do not exceed the APL (French government housing aids) revenues received by future tenants.

Sustainable development approach of the project owner

The client's desire is to have an innovative response to the following themes: construction system, construction economy, urban densification.

The city of Colombelles is part of a zero unemployed territory approach.

· What was your goal?

Build small, low-rent individual housing close to services, for low-income tenants. The rents are fully solvable by the APL for households with very low income.

Reuse experiment

Densification via the reuse of land freed up by gardens barely used by tenants

· What objectives did you set at the start of the project? Is this your first green building?

Proposal for reuse by the MOE, first experiment for LFNDS.

· What makes the difference between this project and the previous ones, with regard to the design, the stages of construction and the final result?

No notable difference (apart from the study of reuse channels), this operation was carried out like a new operation, even on the final result.

Architectural description

The project consists of building 4 semi-detached individual dwellings in pairs. These are located on the ground floor, accessible to people with reduced mobility, made with a wooden frame and wooden cladding on the outside. Each accommodation consists of a main room including a kitchen and a sleeping area, as well as a bathroom and a bicycle room accessible from the outside.

The accommodations are double facing East or West and South. Their location is intended to limit the impact on the sunshine of the original homes and to offer fairly quiet gardens for the houses created.

Building users opinion

We only received positive feedback from tenants (equipment - including those from re-use - sound insulation, no feedback on thermal...).

See more details about this project

https://archiviolette.com/projets/4-logements/
https://www.ouest-france.fr/normandie/colombelles-14460/colombelles-petites-maisons-inaugurees-rue-de-suresnes-6592209

Photo credit

Michel Ogier
The archiviolet

Contractor

Name : Les Foyers Normands

Contact : Fabien Coursier - 02 31 72 41 52

http://lesfoyersnormands.fr/

Construction Manager

Name : L'archiviolette

Contact : Elise Lambert - 02 31 93 11 90

http://archiviolette.com/

Stakeholders

Function : Other consultancy agency

IGC

Yves Martin - 02.31.35.64.35

https://www.igcbe.fr/accueil/

TCE technical study office

Function : Others

Bureau Veritas

Vincent Griere - 02 31 94 55 55

Control office

Function : Others

SOCOTEC

Nicolas Lemercier - 0231462424

Coordiantion SPS

Function : Company

Avenir BTP

M. Fradet - 09 67 85 09 68

Lot 01 - Structural work, VRD, Tiles, Earthenware

Function : Company

Glot charpente

M. Glot - 02 43 76 73 45

Lot 02 - Timber frame wall, timber frame, waterproofing

Function : Company

AMAND

M. Amand - 02 33 56 39 48

Lot 03 - Exterior joinery

Function : Company

CAPPI

M. Neuveu - 02 31 35 05 10

Lot 04 - Interior joinery, plasterwork, ceilings

Function : Company

Michel Marie Peinture

Mme Ferreira

Lot 05 - Painting

Function : Company

Plomberie Millet

M. Levieux - 02 31 84 35 46

Lot 06 - Plumbing ventilation

Function : Company

SOPROBAT

M. Berthout - 02 31 23 72 85

Lot 07 - Electricity

Type of market

Global performance contract

Energy consumption

Calculation method : Other

Envelope performance

More information :

The building envelope is made up of frame walls with glass wool insulation. The exterior facing is a wooden cladding, the interior facing is made of placo panels. The cover is made of waterproofing membrane.

Systems

Heating system :

Electric heater

Hot water system :

Individual electric boiler

Cooling system :

No cooling system

Ventilation system :

Humidity sensitive Air Handling Unit (Hygro B

Renewable systems :

No renewable energy systems

Urban environment

Land plot area : 675,00 m²
Built-up area : 27,40 %

The first virtuous approach of this project is to be part of the dynamic of densification of the city center of Colombelles by following the concept of “Build in my Backyard”.

The plot available for the project is the result of a new plot division and is located on the right-of-way of the gardens located behind the neighboring pavilions. These pavilions, also managed by Les Foyers Normands, are occupied mainly by elderly people. The gardens have become too large for the occupants and are neglected. The “Bimby” concept thus makes it possible to densify urban space by offering new housing while taking advantage of existing infrastructure and limiting urban sprawl.

Construction and exploitation costs

Cost of studies : 28 900 €
Total cost of the building : 283 400 €

Reuse : same function or different function

Batches concerned by reuse :

Structural works
Facades
Indoor joineries
Isulation
Plumbing
Landscaping

For each batch : Reused Materials / Products / Equipments :

Lot 01 (Structural work, road works, tiling, earthenware):

The four exterior gates
Crushed concrete for encashment under the stabilized exterior
Rectangular granite pavers for outdoor parking spaces
100% of tiles and earthenware

Lot 02 (Wooden frame walls, wooden frame, waterproofing, cladding):

100% of the exterior cladding of the four dwellings

Lot 04 (Interior joinery, plasterwork, ceilings):

100% of interior doors (one per unit)
Insulating interior partitions
100% of worktops

Lot 05 (Painting):

100% interior paints

Lot 06 (Plumbing, heating, ventilation):

100% of VMC groups (one per accommodation)

Reused materials rate :

External gates: 4 units re-use on site: 100%

Crushed concrete for collection under stabilized exterior: approximately 260m²: 100%

Rectangular granite pavers to separate outdoor parking spaces: 25 mL: 100%

Floor tiles in the bathrooms: 24 m²: 100%

Earthenware on vertical walls in the bathrooms: 32 m²: 100%

Earthenware for kitchen splashback: about 8 m²: 100%

Exterior cladding: 240 m²: 100%

Interior doors: 4 units

Insulation in interior partitions: approximately 4.5 m3

Worktops: 4 units: 100%

Interior paintings: approximately 450 m²: 100%

CMV: 4 units: 100%

Field of use and material origin :

Ends of stock were used for exterior cladding, tiles and earthenware. The interior paints come from opened cans.

Extern elements were reused: crushed concrete, blocks of granite.

The following elements were also reused: wickets, interior doors, CMV, kitchen sinks.

Reuse being one of the criteria for awarding calls for tenders, the majority of materials were offered by companies and come from their own stock or from external sites.

Some elements were provided by the client: the gates were present on site, the VMC units and the kitchen sinks come from a hotel that had suffered a disaster.

Environmental assessment

Impacts avoided : water, waste, CO2 :

The reuse of materials on this project* made it possible to avoid:

The emission of 6.3 tonnes eqCO2
The use of 1334m3 of water
The production of 6.6 tonnes of waste

These impacts were calculated on the basis of environmental data from the INIES database.

* (excluding VMC and paving stones)

Social economy

Social economy and professional integration :

Lot 04 interior joinery, plasterwork, ceilings was provided by the company CAPPI in partnership with Revivre, a local reintegration association.

CAPPI carries out plastering and insulation work. The projects are carried out by a production team (1 qualified plasterer, 1 employee on a full-time integration path)