Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

This site uses cookies. By using our services, you agree to our cookie use.
Learn more here.

1979 January: Ecological architecture of Lucien Kroll

‘C’est I’exception qui est Za regle generale’. This brief remark of the architect Lucien Kroll sums up his architectural approach, the visual aspect of his work initially looks totally anarchic but beneath it is a serious attempt to create buildings that do not impose on their users but reflect an ecologically sensitive and contextually unique design process.

Ecological Architecture Of Lucien Kroll

To put it mildly, Lucien Kroll’s approach to architecture is unconventional. There are no past masters to whom he turns for inspiration; his buildings derive solely from rigorous application of his own philosophy of what a building should be. Kroll’s descriptions of the conventional products derived from the Modern Movement are laced with the adjectives of oppression: the administrators who commission designers are fond of ‘paramilitary models’; Pruitt-Igoe in St Louis (and developments like it) are the products of generations of ‘somewhat militaristic architects’; the dark glazed windows on the wall of a contemporary office presents a ‘fascist facade’.

‘The programme called for separate rooms. We made them completely regular, like ruled metric paper, and in the facade we used reflecting glass like the sunglasses of American policemen.’ Kroll builds cheaply, using man’s most basic building materials. He has a fondness for artificial slate roofing tiles -mostly the kind made by Eternit: ‘They are cheap, very tough, they accept moss, and live with the weather’. His favourite images are of lichens and lush, succulent plant growth, of weathered rock and the haphazard placing of stones to form walls made by unskilled workers. He likes things built by man that look as if they have been there forever, absorbed into the landscape.

Indeed, landscaping, designed by his wife Simone, is an integral part of any design. Scarcely a hard surface is envisaged without its future covering of ivies or virginia creeper. Kroll is striving to bring his buildings as close as possible to nature, to provide as ‘natural’ a place for fallible, unpredictable man. This explains why he sees no contradiction in building new, hard up against the old, of using concrete “blocks to repair an old weathered brick wall, of using sheets of glazed skylight in the roof of an ancient timber barn. Homogenity of form, and materials, is artificial he says. Large surfaces of brick, like the construction of formal spaces in architecture constitute the victimisation of the inhabitant by the architect.

So not one of his walls will be built entirely of the same material concrete blocks and brick, of different sizes and colours, pave and slates are interspersed -frequently at the discretion of the bricklayer. Stones from the earth run up the wall; roof tiles run down to meet them. It is Kroll’s way of building organically, of trying to create buildings that do not impose themselves on their occupants, that relate to people. Kroll is at pains to gather the commitment of both the future occupants of his buildings and the workers on his sites and involve them all in the design and construction of the new building. He is anxious that people should get the frame for living that most suits their way of life.

He wants to preserve the traditions of craftsmanship and deplores trends towards heavy prefabrication and increasing specialisation. For all his care for those who will use his buildings, Lucien Kroll is not popular in Belgium. His views are understandably at variance with those of the establishment. At first sight, his best known work, the new buildings for the University of Lou vain at Woluwe on the outskirts of Brussels are a complete jumble, their facades a totally disordered (one might say anarchic) collection of brick, glass, grills, balconies, grey tiles, staircases. The authorities dislike them so much that in 1977 they dismissed Kroll as architect.

They have threatened to tear them down, and have already destroyed the planting which was beginning to climb up the buildings. But Kroll’s design is ingenious. Inside the residences, rooms on a variety of levels have been designed to be shared by students in small self-contained units, centred around a staircase. The bedrooms have all been designed to give direct access to a private balcony or terrace outside; internally walls can be built or taken down to give more or less rooms. They are flexible, adaptable, the sun come’s in in the right places, and they are great fun to be in. Many of the principles that governed this design are repeated in the more recent house for Mr and Mrs Sperling illustrated here. There is an inherent contradiction in Kroll’s approach to architecture. For the buildings he has designed all bear the unmistakable stamp, the trademarks of Lucien Kroll, architect.

By virtue of his belief in what architecture should be and his skill as a designer, he cannot but impose his view on society or manipulate those who use his buildings. The involvement of his users and builders notwithstanding, are the buildings he produces anymore the product of spontaneous, organic growth than Buckingham Palace? It is a dilemma that he is aware of. But that Kroll can indeed bring about a successful ecological marriage between new and old building and “natural vegetation can be seen in his project for the Dominican Fathers at Froidment; that he has won the hearts of his users is apparent in the remark of the Dominican sister at the convent at Ottignies, who, despite reservations about the materials and details of the building, said: ‘When we moved in, we felt at home immediately. He did exactly what we wanted in his completely original way.’

The exterior of the convent for Dominican sisters at Ottignies uses materials to suggest simplicity and humility, 1,2. The large barn at the farm at Froidment has been converted into a church by the simple device of turning the roof into a large skylight, 3. At the University of Louvain some of Kroll’s details live up to his description of the building as ‘a natural creation of rocks with worn edges’, 4. Acknowledgment Eternit SA Belgium ,has generously contributed towards the cost of colour printing.

Kroll Convent for Dominican Sisters,Ottignies 

Rising along a slope in the midst of a pine wood are two buildings, centred around a small mounded garden. This is a convent for a group of elderly Dominican sisters, completed by Kroll in late 1975. In briefing Kroll, the sisters wished to avoid the image of power conventionally associated  with a convent. They were also aware of themselves as a dying breed. They wished to create a physical arrangement for communal living that could gradually be given over to other uses as their numbers-originally 13, now 11 dwindled.

Kroll has designed a series of units that can be sealed off, one at a time, to provide a group of individual houses in future. The materials - once again, local brick, concrete blocks, rough castings that have been left rough and lozenge shaped Eternit tiles-were specified not only for their cheapness but for an appearance of poverty Internally there is more of the detailing one associates with Kroll: the corridors are staggered to appear shorter; felt carpeting from inside a room curves out into that of the corridor.

The open tread pine staircases are here; so are  fireplaces and chimney breasts of exposed brickwork. Once again skylights have been used to give effect to important rooms. The chapel, in the basement, away from domestic circulation is lit by a huge window and glass roof from the entrance. Much of the roof of the double height main meeting hall is glazed. Old oak doors from vast antique ward- robes used in the former convent have been used in the dormitory wing for cupboard doors.

5, a series of houses grouped communally-but they are designed to divide up into separate units if the convent community dwindles. 6. a Kroll trick-floor surfaces that leak from one space to another. 7, double height main meeting hall.

Dominican house, Froidment 


Froidment is a former fortified farm that has been converted to provide a church for the village of Brabant, to the south of Brussels, and a permanent home for about 25 Dominican priests and nuns. The similarity of plan and form between the farm and the ancient design of monasteries made the conversion particularly sympathetic. In the north the grange barn became the church, the central farmyard, the cloister, the chapter house is in a former cowshed to the east, rooms for guests in the old farmhouse to the west.

The stable became the refectory. This is no ordinary monastery. The priests and nuns do not wear habits and they live communally with two families with children. The ‘guest rooms’ represent conference accommodation for groups of 30. The library (which specialises in the eighteenth century religious thought of Liege) is also the village’s public library. The public footpath which ran through the centre of the farmyard has been retained. The Dominicans did not want the farm and its extensions to look new or luxurious. So traces of whitewash remain on the old warm bricks. It blends-unexpectedly well-with the concrete blockwork of the new, rounded library.

The barn, built in 1773, was converted almost instantaneously into a church by the brilliant device of putting a huge skylight into the roof. This immediately focuses attention on the altar in the centre of the barn while creating a feeling of height and space. Seating is on a series of wide steps. Rope mesh hung on timber struts forms the edge of the balcony, around three sides of the central area. The church is almost embarrassingly popular. The most extensive area of new building is the residential block built above the old stable. The facade facing the courtyard and roofline have been preserved; to the south, the facade is completely new.

Each person has two levels on which to live: a double height sitting room with private balcony or terrace and a smaller bedroom above. No new bricks were bought for the job and the original was conserved as far as was economical. Inside, new areas are of white painted blockwork, floors and ceilings are concrete. Eternit tiles are on the roof. Finishes throughout are extremely simple. In all, the whole succeeds in suggesting that it has been there for ever, a part of the landscape and the community which it serves.


8, south facade of the residential block. 9, old farm buildings are now guest rooms and adjoin the community’s residential building.

 Kroll House Near Brussels

The house for Mr and Mrs Sperling is set in an eerie, blasted, almost forgotten region on the outskirts of Brussels. Until recently the land was used for growing grapes in glasshouses. Now plots are being sold for private housing. But acres of gently rolling slopes are still covered with glasshouses. The empty ones reveal lengths of obscene tubing and bare vines .. where grapes are ripening the glasshouses seem stuffed with green. There is not a tree in sight.

Into this Kroll has set a tall box of a house, the outside clad in a mixture of light grey Eternit tiles, blockwork and brick. The pitched roof is dominated by a giant glass skylight. The house is planned around a central lightwell containing the hall and staircase beneath the rootlight. The house is designed in the round, with rooms going off to the left of the staircase as you move up the house. Practically every room is at a slightly different level, dug out from differing levels of earth so that, cleverly, all living areas and rooms that need direct access out of doors (the garage kitchen, dining, living rooms) have a terrace. The dining room terrace faces south, the living room west, the kitchen east.

The staircase is Kroll’s standard: open tread pine. The colours for the woodwork are good strong: yellow, green, maroon. Walls are exposed blockwork and brick; floors and landings are quarry tiled; living rooms are felt carpeted. The dominant impression is of a simple, unpretentious house, filled with sunlight.

10, ‘organic’ landscaping breaks down the edges of buildings with stones, water and plants 11, detail of balcony. railing outside each of the living rooms in the community house. 12, a mixture of old and new simplicity indoors. 13. the exterior of the Sperling house is simple, almos conventional. 14, the central stair is clearly articulated. 15, top lit sunny staircase is painted in strong colours. 16, there are slight changes of level between rooms.


Lucien Kroll

Convent for Dominican Sisters,Ottignies (1975)
Dominican House, Froidment (1973)
House near Brussels, Brussels (1979)


Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Links may be included in your comments but HTML is not permitted.