I am planning to build a deck up to a fence on the property line. However, I discovered after measuring and with this image on hitta.se that the property line is not straight. How would you handle this?

If I build along the property line, the deck will have uneven depth (about half a meter over 6-7 m) and I’d have to split boards somewhere. If I build at a right angle, I lose some area which I would more or less give to the neighbor...

Satellite image showing a property boundary on hitta.se with a non-straight line, highlighting challenges in planning for even deck construction.
 
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You should know that you can't rely on the plot viewing; the only thing you can do is look for the so-called markers (usually galvanized pipes in the ground) at the corners to obtain exactly where your plot boundary is. Start with that and string between them; that's the boundary, and feel free to come back PS in such an area, the boundaries are usually 90 degrees
 
Check the maps under 'min fastighet' on lantmäteriet to see if the boundary is straight or not. There are usually coordinates for the break points so that you can calculate where they are located.
 
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There is only one "boundary pipe," and it's basically in the middle of the line. Hitta.se's marking corresponds well with how it looks in reality, with where the fence (last foundation) sits, how far the hedge is planted, how the neighbor's hedge is planted, etc. The neighbor in question totally agrees that the boundary is not at 90 degrees, so there are no problems! However, I can of course double-check with the Lantmäteriet.

But regarding the construction itself: I think it would be both the nicest and easiest to make a fence without any "breaks" at a slight angle to the house, lay decking perpendicularly to the house, and then just cut the ends of the last pieces at the boundary rather than splitting them. This means that the outermost beam must lie at the same angle as the fence, and the outer posts must be turned slightly to follow the beam. That should work, right?
 
The angle becomes very small... about 30 cm over 8.5 m. At one end, it will fit about two more boards (using 145s). Is it possible to cut decking so precisely? In the narrower end, it will basically just be a thin, long strip.

Is it doable, or should I donate the half square meter to the neighbor and build perpendicular instead?
 
Can't you talk to the neighbor and see if there's a way to "give and take"? Draw a straight line between the points so you both "get" a little of each other's land.
 
Well, that's probably how it will be. Then I'll also follow the "sidogrannes" board (which they placed a bit too far out). It feels like it'll be so much easier in every way to build straight :)
 
This is what the land surveyor's map looks like (my plot is 1:304) A cadastral map showing properties with plot numbers and area measurements; plot 1:304, measuring 214 sqm, is highlighted.
If I build straight (parallel to the house) I would have to "give away" a piece at the top right of the image. If I draw the fence diagonally, two boards would need to be cut very pointedly. Not that I think it's that difficult; but the question is whether it's even possible?
 
Nah, then I'd have the same problem (but worse) on the right. Besides, it would feel like the wrong direction...
 
It works if it has to. I forgot to check the measurements at the end and had to make an angled cut on a 4 m board (2.5 cm difference between the short ends) to make it fit against the house. I laid the board on sawhorses and clamped a straight board on top as a guide at the desired angle, then carefully ran the circular saw along the guide. It took a little extra time, but if it's just about two boards, it doesn't matter much.
 
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