Heavy Trash Out - $1250Replace worn carpets and pads in 6 large living areas - $3750Patch and touch up walls, ceilings, and closets - $625Full paint on trim, interior doors, HVAC vents and window seals - $12502).

Exterior seals around 4 single pane windows were rotted out.

Or have a structural engineer or an architect go out there and say that there is nothing wrong with how you put in the window and that its plum, sealed tight and water proof and write that in their professional opinion that its okay. 

A corporate kit (record book) which includes Stock certificates & Corporate Seal 10.

This is one of them.If you decide to replace the siding, I would do, and have done, 30 pound felt paper wrap covered with 3/4 inch foam sheathing (joints sealed with Tyvek tape) and hardi plank lap siding.

There are sprays that reduce seal wood to burn odor,,,looks rather whitish or gray in color.

You can also seal the subfloor after treatment

Cheapest way: Simply power wash then seal any access points where water could intrude.

They claim to seal a flat roof for 50 years.  

As an update, here is an email I got from another company, not locally based and appear more competitive.Patrick,We have the panelized kit estimate for your new homes and it includes the following:Preliminary plansFinal plansAssembly plansCustomer serviceDeliveryNo sales taxQuality kiln dried woodPanelized 2x6 exterior walls with 7/16 exterior with window/door openingsPanelized 2x4 interior walls with door openingsRoof trusses with 5/8 roof sheathingPorch roof with square porch postsSill plate/seal for the foundationBlack paper for the roofThe panelized kit estimates are:$31,800Now, this is for a 1,491 sf home......