Generally, I find it commonplace that approximately 10% of your properties value is a maximum figure to not over capitalize, however above and beyond that doesnt factor in personal choices, like upgrading to a specific stone or appliance to suit your needs or wants. These things I would weigh up depending on how long you plan to live with the kitchen, and if it will be a long term ownership or short term with potential to sell with profit. You can easily send off a benchtop plan to any benchtop fabricator or even a st e mason and ask them to quote, just include walls, and indicate exposed edges of the bench so they include a polish cost, and any cut outs indicating your ski or hotplate etc. Where possible, note your stone colour choice for accurate costing, and then ask your cabinet maker to quote Benchtops separately, this way you have disclosed the biggest cost and decide to get it where it works for you.

As a kitchen designer, it depends if your kitchen will raise the bar in the home valued around 800k or if it is need to be upgraded To fit into your interiors current style and standard. There are always many options, but let's look at two. 1. If the layout works within your floor plan, although would be necessary to upgrade appliances for either functionality or form, then you would benefit from a re fit out, with modern fixtures and finishes. 2. If you plan on modifying the current interior,and possibly reconfiguring the layout or even the zone in which the kitchen can be installed, then entirely re design and fit out with a fresh approach, considering all the options to explore complimenting your layout and flow throughout. excluding your appliances, a mid range to top end kitche of an average size should not warrant being more than 5-10% anyway, the 15% mentioned would be all inclusive, and designer fit out. Can achieved at a much lower price range. research your layout, and what fixtures you will wanting/needing to make it yours,seldom lay do kitchens swallow financial gain, they almost always are the Single lost important factor in the interior. If it's a home you plan on being in 10+ yrs, absolutely, spend what is required,but optimise your homes potential and consider the kitchen in a broader setting of your homes interior. if not, consider id range products like vinyl or pre finished doors products with stone bench tops as a standard for most. Save on doors and panels, products like. Contour doors by laminex or vinyl doors over paint or veneer and spend thesavingon stone. It's tactile,a dis the most factored in material.

the plan looks great but not sure if you want/need a microwave or rangehood so my suggestions include wider under bench cabinet into the left hand void space with the 30cm door, assume an under bench oven, a microwave could be 30cm above the counter under the right hand wall cabinet, space under the microwave for toaster and kettle, wall cabinets to at least the top of the windows and deep enough to reach the edge of the architrave around the window (the extra 2-3cms depth makes a big difference for tight storage, cook top parallel and towards the front off centred along the counter allows for above cooktop wall cabinets 60cm tall with 140 deep open shelf and optional range hood fridge with microwave and wall cabinets oven with open shelf, wall cabinets and rangehood cabinets showing position of cooktop, range hood and mw the awful colours are due to limitations of my vintage program and your colour scheme is the best

thanks for your information which complies with our recent experience ..our mid range kitchen was just over $40,000 with custom designed cabinets to suit specific personel needs, mid range appliances and basic laminates...stone benches for my kitchen would have added an extra $7000 but i chose the custom sized cabinets and extra shelves in all cabinets...: so much detail to consider