Costs for demolishing a house with asbestos

We paid about €700 six years ago for the dismantling and disposal of 20 sqm of asbestos-containing roof covering (corrugated sheets). Of that, €250 was for administrative tasks (registering the work, etc.). For the demolition of approximately 22 tons of building, we paid a total of about €26k back then for dismantling and disposal. The approximate weight of a 300 sqm house can be roughly estimated using a reference book. From my gut feeling, I would say that the offer is a defensive offer, but I have not recalculated it yet.

Before obtaining further offers, I would first find out everywhere where asbestos is. Very old house and asbestos usually exclude each other. Anyone confronted with "proper asbestos" applies multiple safety factors.

Be sure to get several offers. In 2016/2017, we had offers exceeding 100k. Ultimately, we cleared the property for a little over 40k, with an asbestos roof on the barn. What was demolished was an agricultural estate: barn, stable, outbuildings, residential house.

Each federal state does disposal a bit differently.
For us, it went as follows:
The roof with asbestos was removed first with all protective measures by a specialized company. That cost just over 3,000 at the time.
The rest was piled into two heaps, tested, and disposed of accordingly. We had an agreement for disposal according to waste volume and pollutant category. Lower pollutant categories are cheaper. Plus travel costs—the worst category would have been a 60 km one-way trip.
One interior wall worried the contractor—it was built after the war. We were lucky, as neither the cowshed nor the house with the outbuilding was particularly contaminated.
And we gave the demolition company a long time window of a little over 6 months and did not require demolition in March.

We had two bottlenecks: about 2.5 m at the barn corner and an outbuilding with about 1 m distance. For some, this was a cost driver, for others not. One wanted a complete road closure for 4 weeks—the next wanted traffic lights—the one after that nothing at all, "reason: we are always allowed to briefly stop traffic if there is imminent danger." One wanted to crush on site, another nonsense, no space anyway, so just remove it.

We are considering demolishing an old, dilapidated house of about 300 sqm to build anew. The house apparently contains a significant amount of asbestos, and on one side it is very close (1m) to the neighboring house. [...] and secondly, it supposedly contains considerable amounts of asbestos and other hazardous substances. In the meantime, disposal has apparently become very costly. Do you think it is worth obtaining several more quotes, or is this a realistic offer?

Agree with the seller to only commit contractually after an expert report (hazardous substance report and individual renovation roadmap), and how to handle the costs of these professional assessments depending on whether you decide to buy or not. Then involve an architect with expertise in "building within existing structures" (unfortunately NI is far from NW, otherwise you could already have found a suitable expert here in the person of ), who can have a course of action developed based on a renovation roadmap. Then have the materials sampled and have the architect plan the sequence of the demolition measures. Disposal is essentially a matter of three dimensions: 1. suitability of the dismantling company and protective measures for workers and surroundings, 3. volume and weight of the materials, and 2. purity of the materials by type. In planning the sequence, a key role is played by how well the hazardous materials can be removed before the less expensive measures and specialist-required components become accessible. Disposing of the entire conglomerate unseparated as a mixed lot of very, moderately, and non-problematic materials will be a procedure many times more expensive than first removing the "toxins" and then, (possibly with entirely different personnel) tackling the probably much larger "rest" as separately as possible.

The small distance to the neighbor will mean that the new building must comply with current requirements for building setback. In this regard as well, you could probably forget about a rookie builder.

Never ever Where should asbestos be installed? Probably the roof, possibly pipes... You can throw the offer in the trash. Where is that? If it's in BW, I can name you a few good companies

Where is asbestos supposed to be installed? Probably the roof, possibly pipes...

In about 2,500-3,000 possible products where asbestos was used. Behind heating niches, in the plaster, in the adhesive under the floor covering, in the facade, fire protection panels behind stoves, fireplaces or heaters, lightweight boards for the ceiling, etc. Or it is a prefab house where you can still find asbestos without end behind the paneling. So actually first search for asbestos, then calculate (or have calculated) the price and buy the property.