Blend in with local architecture
Use your style of house and current colourways, e.g., of bricks, stone, window frames, front door, cladding, etc. as the starting point. Choose a colour that complements your style of home and others close by. In doing so you can add aesthetic value, reinforce the quality of the property, and give a great first impression of your locality to visitors, and buyers.
Different house styles are defined by their architecture. And, increasingly, the wide mix of colours available are being associated with different property types, e.g., heritage colours which are designed to appeal to owners of period properties, often in soft shades of grey, green, blue, etc.
None the less a more modern contrast can also work well say against a painted white or ivory stone wall or red brick, often seen with traditional, older properties. Conversely, heritage colours can also look good with contemporary properties.
So, whether a property is labelled old or modern, you can choose from conventional colours, neutrals or add a pop of colour to suit the theme of your home and the surrounding area.
The effect can still be bold, blend in, and yet still feel cohesive.