Ways around paying sales tax on building supplies?

[N/A N/A]

Washington state's sales tax rate is out of control - 8.6%. That's a huge chunk of change on the $300,000+ homes we're planning on building this spring.

Are there any ways around paying the sales tax? The builder is a relative if that matters at all.

Any help would be great. It just doesn't seem right to pay the government $20k. I'd be ok with a smaller %, but the full 8.6% is ridiculous.