2-story side/back additions are possible, but floor level of the 2nd floor of the addition will be few inches higher then original house - can be easily solved with couple steps. Due to some cost factors, modular additions are cost effective on 500+ sq ft projects.
• It cost less - but only if you compare apple to apple. Going rate of sq ft of addition is about $150 at this time, but this price usually would not include architectural materials, many "extras" and will basically provide you with basic house. For the same ~$150/sq ft you will get above average modular addition with moldings, doorknobs, top brand fixtures and cabinets. In nutshell you can buy full size Lexus for price of full size Toyota, but this will not make you happy you if you are budgeted to buy Scion. No matter how you slice it modular addition will not cost you more then traditional stick building especially in areas with as expensive labor as NY-Metro.
• Floorplan Limitations - modular additions we offer are custom build to your specifications and there is no limits of any sort.
• Lower resale value - don't mistake our high-end modular additions with trailer-park prefabs. Only deference from stick build it's much higher quality and build in controlled environment. There are number of multimillion houses in sold in recent years in Franklyn Lakes, Alpine and Montclair that are modular. We never seen value of well built modular addition to be lower then stick-built. In reality there is no way to see that this is a modular addition without some precise measuring
• Low end housing - modular means roughly but pre-built at plants, quality-wise it has to be at least as good as stick plus be sturdy enough to be transported. Controlled environment saves lumber from been exposed to elements white built, also inside- out building extra advantages such as pre-gluing drywall before it's screwed. Modular built by experienced professionals that specialized in the particular part of contraction, not a White stick built addition will use 2x4 studs on outside walls, modular will use 2x6.
• It will fall apart - modular units are sturdier then stick built, simple test: would your house withstand transporting from another state? It will fall apart, while modular additions are transported across of hundreds miles. Modular additions are also built to be above all local codes, so it allow manufacturer to save by following one standard for entire region.
• Town/Building department wouldn't like it - first of all building department is always happy if something is done above standard and come with inspections passed. Meanwhile building department get paid same amount as for traditional addition, where they have to inspect and re-inspect. Modular additions are inspected at the manufacturing plant and come with all inspections but final passed.