The property is just over 10 years old and the claim was raised/reported in writing to NHBC before the warranty expired.
The house is a detached bungalow and the issue is one regarding the kitchen floor, which is showing signs of settlement manifesting in cracks and broke tiles; and up to 20mm settlement. NHBC have monitored the settling for over 18 months and agreed their is a claim.
I have myself had a contractor remove 2 floor tiles and a small area of floor screed. This has indicated that the screed is cracked and (where it was exposed) only 50mm thick, it should be > 65mm. The full settlement is a combination of floor slab settlement (say 6-7 mm), insulation compression (say 6-7mm) and screed failure (say 6-7mm), thus totaling up to 20mm overall. The main issue is the screed.
The NHBC have offered a cash settlement of approx. £3,000 to lift the tiles, lay a self leveling screed and then new tiles. I am not content with this as it only repairs the cosmetic damage, not the broken screed.
I myself am a chartered structural engineer and have been corresponding directly with NHBC. As they have refused to go beyond cosmetic repair, I now need professional advice on NHBC's liability in order to relay to them there obligations, thus strengthing my case for investigation and rectification of the underlying structural problem.
My opinion is that although settlement has pretty much ceased (NHBC monitored just over 1mm settlement over an 18 month period), the repairs they suggest will allow any new tiles to fail in the future.
I summary I need professional advice from someone who is familiar with NHBC's obligation and to provide information of what may happen if I go legal. My own impression at this point, is not to "go legal" with solicitors letters but rather put a further letter to them undermining there stance and supporting mine. i.e. My original question of where can I find a local expert - or perhaps you can help?