The main office Christiaens Yvan is currently taking a break. We will be back on 17th August 2022. Thank you for your understanding.

Annual summer break from Wednesday 20 July 2022. We will be back on Wednesday 17th August 2022.

Yvan Christiaens, manufacturing garden houses for more than 35 years

For over 35 years garden house manufacturer Yvan Christiaens has been designing, producing and delivering garden and pool houses, chalets, granny annexes, garages, log cabins, horse stables and doghouses at the best price-quality ratio. The long experience combined with our state-of-the-art machinery enables us to manufacture any wooden annex in the most professional manner possible. A beautiful standard garden house can be supplied 4 to 6 weeks after order! It takes us a bit longer to deliver a customised garden house – our speciality; it all depends on the requested dimensions. A ready-made construction kit or a customised garden house? Endless combination options through our extensive service network; from classic to cottage, from modern to design. We work with our own installation team, and also offer earth and concrete works.
Thoroughly enjoy yourself in style …. throughout all 4 seasons, year in, year out.
Ask us for a sales point or service point nearby and receive your free Catalogue.


  • burelenHead Office
  • dealerService Point
  • servicepuntSales Point
  • aannemerContractor

There is sure to be a Sales Point or Service Point in your area, ask for it.
Every product is distributed throughout Europe via our dealer network. These carefully selected sales points and service points meet our strict quality requirements and can do all the work for you. Our Service Points can prepare the foundations, assembly and take care of the finishing, giving you the after-sales service that you desire. All of our Sales Points and Service Points use the same prices.
Contact us for the name and address of a Sales Point or Service Point in your area and we'll send you our Catalogue. You will receive a guide "How to request for a quotation", a form for requesting a quotation, some prices and a gift voucher.
With these documents you will be well informed to visit your Sales or Service point.

Have a look into the Christiaens Yvan Catalogue.

132 pages full of ideas and exclusive Garden Houses, Carports & Poolhouses. For more than 35 years the one and only garden house manufacturer. Christiaens Yvan delivers and installs garden houses all over Belgium.


Your garden house is permanently being subjected to all kinds of – at times extreme – weather conditions. Rain, wind, UV rays, high and low temperatures. All of this ages the wood. Yvan Christiaens has a wide range of maintenance products that lengthen the life of your garden house, carport or pool house.

1. Premium coloured stains for the treatment of a pine garden house.


Impregnation and protection of pine by one simple treatment: only 1 product needed!

  • Precautionary effective against mould.
  • Protection against rot, woodworm and algae.
  • Easily applicable.
  • Chip-resistant.
  • Waterproof, breathable and moisturising.
  • Semi-gloss.
  • Technical features: click here

Our premium coloured stains are a water-based multilayer system that offers protection against moulds; they lengthen the life of your garden house. A pine garden house must be treated immediately after construction. After the treatment the wood texture will still be visible and noticeable. We recommend to repeat this procedure every 2 years.

Available in various colours.







Pale Oak

Pale Oak





Cosy Grey

Cosy Grey

Salt Green

Salt Green

Colour stain Pro Cosy Grey is ideal to be used on a autoclave wooden garden house.

  1. Autoclave wooden garden house, 3 years after installation.

Garden House, autoclave wooden garden house, 3 years after installation.

  1. Autoclave wooden garden house, after 3 years treated with Woodcleaner Nano Coating Pro.

Autoclave wooden garden house after 3 years, treated with  Woodcleaner Nano Coating Pro

  1. Autoclave wooden garden house immediately afterwards treated with Colour Stain Pro Cosy Grey..

Autoclave wooden garden house immediately afterwards treated with Colour Stain Pro Cosy Grey.


2. Nano Coating Pro to treat a garden house in oak, iroko, cedar and thermo wood.


2.1 Nano Coating Pro Woodcleaner, a wood cleaner for garden wood.
Nano Coating Pro
Woodcleaner is a water-soluble cleaning solution especially developed for wood. When untreated wood is subjected to all weather conditions, it becomes dirty and more sensitive to the formation of moss or mould, unequal ageing, etc.

Ceder Woodcleaner - VoorCeder Woodcleaner - Na

Nano Coating Pro Woodcleaner guarantees in-depth cleaning of weathered wood, and removes mould and algae*. It thoroughly removes all dirt, and restores the wood’s original look and natural beauty. Nano Coating Pro Woodcleaner is used to prepare the wood for the surface treatment with Nano Coating Pro Woodprotector. (*in case of intense formation of algae or moss, the wood must be treated with a moss remover or fungicide)


  • Nano Coating Pro Woodcleaner is easy, quick and effective. Contrary to high pressure cleaning, Nano Coating Pro is streak-free and does not damage wood fibres.
  • Free of oxalic acid and chloride!
  • Harmless to plants!

2.2 Nano Coating Pro Woodprotector, impregnating agent for untreated wood.
Nano Coating Pro Woodprotector
is a water and oil repellent maintenance and protection product for garden houses in thermo wood, iroko and cedar. Nano Coating Pro Woodprotector penetrates the wood surface and forms a durable and protective coating, without opening the wood fibres. Easier to clean and maintain the wood. Thanks to Nano Coating Pro Woodprotector the formation moss and algae is made more difficult.


  • Transparent and slightly foaming liquid
  • High penetration capacity thanks to nanotechnology and solvent
  • Chemical and physical bonding with the wood
  • Surface remains unchanged
  • Water and oil repellent
  • Protects against acid rain and pollution
  • Hampers adhesion of algae, moss and mould
  • Contains antibacterial and UV-blocking additives
  • 100% breathable
  • Does not open the wood fibres
  • Free of silicones, wax and oil
  • For all wood types
  • Does not stain other materials


  • Provides higher resistance against dirt, water and oil
  • Easily and quickly applicable
  • For an easy cleaning and maintenance of wood
  • Does not stain other materials


  • Hardwood, oil-rich woods and thermo wood

Lengthen the life of your garden house or carport. Order your maintenance products online.

Order here your coloured stains and woodcleaner.

Christaens Yvan charges an hourly rate of 110,- EUR/man for the first hour. The first hour is always fully charged. The following hours of work are charged at an hourly rate of 65,- EUR/man, charged per quarter of an hour. Additional call-out charges are set at 65,- EUR (fixed price). Used material and parts to be replaced will be charged additionally. All prices are excluding 6% or 21% VAT.

1. Is it normal that the garden house has water marks and/or moisture stains?

Yes, after a long period of rain – or on the weatherside, water marks or moisture stains can be visible . Therefore we recommend the following:

  1. Apply 1 layer of stain to the inside walls of your garden house.
  2. Have a damp proof membrane [option] installed during the production process (post-insulation is possible).
  3. Place one or more ventilation grids!
  4. If you want, you can install OSB boards on the inside.
  5. Treat the outside with Nano Coating Pro Woodprotector or with a colour stain.

2. Is it normal that the windows and doors are jammed?

Jammed windows and doors can be fixed by loosening or fastening the adjustable hinges.

Adjust doors:
Push the door upwards by holding the handle until the door is released from the hinges. Use a screwdriver to adjust the hinges. Rotate one time anticlockwise in summer, and one time clockwise in winter. Repeat until the desired result is achieved.

Adjust windows and doors + lubrication of all moving parts. Ask our Christiaens Yvan team to do this for you at the current hourly rate and call-out charges.

For doors: adjust the height of the door at the rollers. It is also recommended to lubricate the door lock and the hinges at regular intervals. Wood treatment: every 2 years, you should apply an extra layer of stain (free colour choice) to the interior side of your wooden window frames and doors.

3. My Salt Green or Cosy Grey garden house has stains. Is that normal?

Wood in those colours was autoclave treated and needs time to dry. This drying process could take a few months to complete.

4. My garden house or wooden shed is moist.

This happens especially during winter. Good ventilation is very important, and a small construction dryer might work miracles.

Because of the moist, window and door frames might expand, and subsequently get clamped. This can also happen right after the garden house is built, when the concrete slab has not completely dried out.

5. Is it possible that the boards of my garden house do not all have the same width?

Yes, whitewood is very sensitive to weather conditions such as moist (swelling), sunlight (shrinkage), and it can measure up to a few mm difference.

6. Is it normal that the flat roof edging is made of pieces with various lengths?

Yes, it exists of 2 or more pieces and there is no minimum nor maximum length. 
Along the full roof length and on the corners the eaves are fit into each other through aluminium profiles. However, the length of the eaves is made out of one piece. Through special gluing, a unique and beautiful result can be achieved.

7. When opening the packing of the supplied garden house, I see blue liquid. Is this normal?

This is indeed possible. After production, the entire garden house is autoclave-treated for a while, so all elements are pre-treated. Even though perforated packing is used, it might be that not all (blue-coloured) liquid has drained. This is, however, no problem and is particular to the production procedure.

8. Is it normal that, in summer, my door panels have gaps?

Yes, the production procedure considers maximum expansion (during winter). In summer, wood can shrink which might result in gaps. It is yet very easy to manually, without using any tool, shift the tongue and groove boards to close the gaps.

9. Is it normal that my roof retains some water?

During production, a slope gradient up to 3% into the direction of the drain side is provided. Between the drain hole and the side, or between both drain holes some water might be retained. This is, however, absolutely not harmful to your roof.

10. Is it normal that roof beams of autoclave garden houses are not fully sealed?

All parts are manufactured in our workshop, after which they are put under pressure in a container. Only by this procedure, the saw cut is treated. We try to consider shrinkage and expansion as much as possible beforehand, but sometimes there is a gap nevertheless. Such gaps are no disadvantage to the construction.

11. Is it normal that the outer walls of my Cedar/Oak/Iroko/Thermo ayous/Cosy Grey/Salt Green wood garden house are composed of boards with different lengths?

Yes it is, because we use all-round tongue and groove boards. They were specifically manufactured to cover industrial buildings, house fronts, etc. The easy to manoeuvre boards have been perfectly cut and milled in our production hall. After the cedar wood has weathered, the various lengths won’t be that visible and it shall not affect the strength of your garden house. On the contrary, the wood shall bend and move to a lesser extent.

12. Is it normal that the stainless steel nails in panel constructions are visible? Why are they not concealed?

Yes it is. 25 years ago, the boards where only fixed by hidden nails in the tongue and groove joints. Since wood naturally expands and shrinks (due to weather conditions), they got loose after a while. At Yvan Christiaens, boards are nailed in a concealed manner, and then nailed through the wood for extra solidity. Over time, these stainless steel nails become almost invisible.

13. Are cracks and fissures in the wood normal?

Wood is a natural product: in summer it shrinks, while in winter it expands. Shrinkage cracks, bows or dead knots are perfectly normal, also in laminated wood. Window and door hinges should therefore also be adjusted. Impregnation might result in marks, white deposit or faded parts. All of this is normal and inevitable. The construction’s strength shall not be affected by any of this.

14. Is the presence of resin glands normal?

Wood is a living material, both in storage and when being processed. Resin may ooze out of softwood; this is normal. If this bothers you, it can be removed with a wood chisel or with turpentine.

15. The boards have different colours, is that normal?

Each tree has its own tint. So a difference in colour is logical, even after staining. This will diminish, and may even disappear completely, over the course of time and with exposure to sunlight.

16. Is it normal for the roof board to have scratches on it?

The roof cladding can develop small scratches during handling. However, this will not affect the quality of the cladding. It will not rust!

17. Why is there a crack near the hinges of my garden house door?

A crack on the outer part of the door at approximately 5 cm from the hinges? If the door of your garden house is installed in a corner, a clumsy move or the wind can make the door flip over, causing damage such as a crack. This is no structural defect. Install a doorstop to prevent the door from opening over 180°.


18. There is small gap of a few mm at the top or bottom of the door. Is that normal?

Because wood expands and shrinks it is indeed possible that a gap shows at the top or bottom of the hinged doors of your garden house. The doors are tailored for use in a garden house or other wooden construction, and are only held back by the door lock in the middle. Despite a correct adhesion, the doors can slightly warp on the outer ends, and at the changing of the seasons a small gap can show.

opening boven deur

19. There are stains on the autoclaved wood of my garden house. Is this normal?

The autoclave treatment can result in stains on the wood of garden houses and carports in Salt Green and Cosy Grey. These stains can easily be removed using methyl alcohol (for sale in any DIY store).

20. Could the silicone sealant of my garden house windows come loose after a certain time?

Yes, that is possible and perfectly normal. The silicone sealant is also exposed to diverse weather influences, and after a certain time, it will come loose and/or fall away. The solution? Add up with transparent paintable silicone sealant where necessary, or remove the old silicone sealant and replace it with a new transparent paintable one.

21. I see stains on my terrace after the unloading of the garden house or carport, or during the construction thereof. Is that normal?

Upon delivery, some wood types and also autoclaved wood may produce a fluid resembling blood. This is caused by moist. When it rains, particular substances are set free and come out of the wood. This might result in rusty stains on your stone terrace floor. The stains are not damaging and can be removed with terrace tile cleaner.


22. Is it normal that on a flat roof the eaves or edge boards or wall remain wet after rainfall?

Yes, an EPDM roof is always edged with an aluminium profile. When 2 of those profiles are connected by means of an intermediate piece, there will be a seam. For technical reasons, this seam is never sealed up with silicone. That is why after rainfall water marks on the eaves or on the walls can appear around this seam. This is completely normal, and will not affect the wood nor the garden house. See also factory buildings or houses.

Boordplank   factory building

23. There a damp patches on the inside of my garden house. Is that normal?

The windows and doors of our garden houses are equipped with a weep drainage system, which is either visible or invisible. During long and/or heavy rainfall this system might not be able to drain all water, leaving stains. This is normal and in accordance with the current standards for garden houses. The standards for this that apply to homes, are much stricter. You can treat the windows and doors with a water-repellent product, but you don’t have to because all possibly accumulated moisture will eventually dry up. There is sunshine after the rain.

   damp patches

24. There are stains on the windows and I can’t remove them by any means. Is this normal?

We recommend to clean all glass elements of windows and doors within 8 days after installation of the garden house, and not to leave them exposed to the sun!
This could cause penetration of lime and/or Cosy Grey or Salt Green products, which is indeed very difficult to remove. We recommend the use of acetone as a cleaning agent for glass.

25. Is it normal for door hardware to oxidize?

Garden houses are equipped with door hardware. Oxidation is normal after a few months but it won’t affect its operation. We recommend to treat all hinges and locks with WD40 (already in your possession).

hardware to oxidizehardware to oxidizehardware to oxidize

26. Is it normal for my garden house to have dark stains or mould?

In our humid Belgian climate, discolouration and/or mould stains are absolutely normal. The wood shall not be affected by it. You can prevent mould by maintaining your garden house with hydro oil. But the best thing you can do, is to handwash the wood with a mixture of hot water and a bit of bleach; as it is applicable on floors, terraces, etc. Never use a high-pressure cleaner..

discolouration and/or mould stainsdiscolouration and/or mould stains

27. Is it normal that there is a little round hole in my garden house’s wood?

Yes, wood is a natural product that swells and shrinks under the effects of the weather. As a result of that, non-weathered knots can come loose. Those holes can easily be filled with wood paste in the colour of your choice (eg. Gupa Wood Filler), without any special material or knowledge being required. Moreover, such filling products are specifically developed to fill cracks, fissures and holes.

Niet-verweerde knoop in houtNiet-verweerde knoop in hout

Nieuwe openingsuren full

Hoofdkantoor Christiaens Yvan

Our opening hours:
Monday till Friday: 8h - 12h • 13h30 - 16h
Saturday: 8h - 12h
Or by appointment.

Tip: on Saturdays, it can be very busy between 10 and 11 am. Try to avoid these hours in order to shorten the waiting time.
The waiting time is shortest between 8 and 9 am.

When visiting our offices, we thank you in advance taking care of our Precautions and Safety measures.
Also with a maximum of 2 persons. 

Prevention & Safety

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