The tightened version of the Energy Saving Ordinance applies from 01.01.2016: the requirements for the insulation value of the components are increased by 20%, those for primary energy consumption by 25%. It is thus practically impossible to plan a building with a monolithic wall construction (aerated concrete, perforated bricks, climate light block) without additional ETICS, which drives the costs enormously higher. The gas condensing boiler without additional regenerative energy producers, previously possible through compensatory measures in the form of a 15% improved building insulation, is thus no longer possible for the time being. The costs for building services therefore also increase.
It therefore makes sense to submit the building application or start construction this year (stamp receipt of building application or start of construction notification for approval-free construction projects). However, if you have not yet carried out any preliminary planning or have not contacted an architect so far, it will be very tight. Preliminary design/design up to building application maturity takes time, depending on the complexity of the construction project, which in turn is determined, among other things, by the site situation and the associated building and planning law requirements. Is there a development plan or does §34 Building Code apply? Does a building enquiry need to be submitted before the building application? Then 01.01.2016 is no longer realistic.
You should discuss these framework conditions in an initial contact with an architect you trust. This is usually free of charge. It does not necessarily have to be the only architect who happens to have an office at the building site. What matters is the personal relationship and stylistic compatibility.
Financing can realistically only be discussed when there is preliminary planning/a preliminary design with a subsequent cost estimate from the architect. Banks/lenders will want to handle it this way. Concluding financing without this preliminary planning is risky because you have thereby definitively set the framework for the construction project before clarifying what costs will actually be incurred. Additional financing may be more expensive or not possible, or the credit framework may be set too high: if proof of use must be provided (KfW loan), this can also become problematic.
So: think it over calmly. When building and renovating, haste and spontaneous decisions are out of the question. The matter is too complex and too expensive for that.