Glossary entry (derived from question below)
English term or phrase:
working out
Spanish translation:
empezando desde adentro hacia fuera
English term
Ireland
20 yrs+ quality translations, Trados
Native in: Spanish 
, English (Variants: British, Irish, UK, US)
Works in: English to Spanish, Spanish to English, Italian to English, and 8 more.
working out
Our mission is to enhance the way people live through great design
We were the first property designers to offer buyers a choice of fixtures and finishes to suit their tastes
We also design bespoke furnshings and have published a book
The way we design is by starting with the inside (interiors) and working out (architecture)
The idea of xxx is that it’s not about us the designer.
Mar 1, 2013 11:48: Nikki Graham changed "Language pair" from "Spanish to English" to "English to Spanish"
Proposed translations
United States
Experienced Translator & Project Mgr.
Native in: English , Spanish
Works in: Russian to English, Spanish to English, English to Spanish, and 5 more.
empezando desde adentro hacia fuera
Spain
Margarita Ezquerra (Smart Translators, S.L.)
Accredited translators 20 yrs experience
Native in: Spanish
Works in: English to Spanish, Spanish to English, French to Spanish
empezamos diseñando (la estructura) de interiores, para pasar a la de exteriores
desde el diseño de la estructura de exteriores a la de exteriores
Native in: Spanish (Variant: Standard-Spain)
Works in: French to Spanish, English to Spanish, French to English
empezando desde el interior y avanzando hacia el exterior
Uruguay
ATA Certified and technical background
Native in: Spanish (Variant: Latin American) 
Works in: English to Spanish, German to Spanish, Spanish
evoluciona hacia afuera
Nuestra forma de diseñar comienza por dentro (interiorismo) y evoluciona hacia afuera (arquitectura).
//
Me parece que se puede mantener bastante fiel al original y nombrar las dos disciplinas.
¡Suerte!
comienza desde dentro hacia fuera
"Nuestro método de diseño comienza desde dentro (diseño de interiores) hacia fuera (diseño arquitectónico)"
Discussion
Empezamos con el disegno interior y trabajamos hasta el exterior.